.github/workflows/build.yml

@@ -1,36 +0,0 @@
-name: build on tag
-
-on:
-  push:
-    branches: [ web ]
-  pull_request:
-    branches: [ web ]
-
-jobs:
-  docker:
-    runs-on: ubuntu-latest
-    name: Build
-    steps:
-    - name: Check out code into the Go module directory
-      uses: actions/checkout@v2
-    - name: Set output
-      id: vars
-      run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
-    - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v1
-    - name: Login to Docker Hub
-      uses: docker/login-action@v1
-      with:
-        username: ${{ secrets.DOCKER_HUB_USERNAME }}
-        password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
-    - name: Build and push
-      id: docker_build
-      uses: docker/build-push-action@v2
-      with:
-        platforms: linux/amd64, linux/arm64
-        push: true
-        tags: ${{ secrets.DOCKER_HUB_USERNAME }}/go-charts
-    - name: Image digest
-      run: echo ${{ steps.docker_build.outputs.digest }}

.github/workflows/test.yml

@@ -0,0 +1,44 @@
+name: Test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go:
+        - '1.22'
+        - '1.21'
+        - '1.20'
+        - '1.19'
+        - '1.18'
+        - '1.17'
+    steps:
+
+    - name: Go ${{ matrix.go }} test 
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go }}
+
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v2
+
+    - name: Get dependencies
+      run:
+        curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin latest
+
+    - name: Lint
+      run: make lint
+
+    - name: Test
+      run: make test
+
+    - name: Bench
+      run: make bench

.gitignore

@@ -14,4 +14,7 @@
 # Dependency directories (remove the comment below to include it)
 # vendor/
 *.png
-*.svg
+*.svg
+tmp
+NotoSansSC.ttf
+.vscode

Dockerfile

@@ -1,23 +0,0 @@
-
-FROM golang:1.19-alpine as builder
-
-ADD ./ /go-charts
-
-RUN apk update \
-  && apk add docker git gcc make \
-  && cd /go-charts \
-  && make build
-
-FROM alpine 
-
-EXPOSE 7001
-
-COPY --from=builder /go-charts/go-charts /usr/local/bin/go-charts
-COPY --from=builder /go-charts/entrypoint.sh /entrypoint.sh
-
-
-CMD ["go-charts"]
-
-ENTRYPOINT ["/entrypoint.sh"]
-
-HEALTHCHECK --timeout=10s --interval=10s CMD [ "wget", "http://127.0.0.1:7001/ping", "-q", "-O", "-"]

Makefile

@@ -1,9 +1,20 @@
 export GO111MODULE = on
 
-.PHONY: default test test-cover dev build
+.PHONY: default test test-cover dev hooks
 
-build:
-	go build -tags netgo -o go-charts
 
-release:
-	go mod tidy
+# for test
+test:
+	go test -race -cover ./...
+
+test-cover:
+	go test -race -coverprofile=test.out ./... && go tool cover --html=test.out
+
+bench:
+	go test --benchmem -bench=. ./...
+
+lint:
+	golangci-lint run
+
+hooks:
+	cp hooks/* .git/hooks/

README.md

@@ -0,0 +1,542 @@
+# go-charts
+
+Clone from https://github.com/vicanso/go-charts
+
+[![license](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/vicanso/go-charts/blob/master/LICENSE)
+[![Build Status](https://github.com/vicanso/go-charts/workflows/Test/badge.svg)](https://github.com/vicanso/go-charts/actions)
+
+[中文](./README_zh.md)
+
+`go-charts` base on [go-chart](https://github.com/wcharczuk/go-chart)，it is simpler way for generating charts, which supports `svg` and `png` format and themes: `light`, `dark`, `grafana` and `ant`. The default format is `png` and the default theme is `light`.
+
+`Apache ECharts` is popular among Front-end developers, so `go-charts` supports the option of `Apache ECharts`. Developers can generate charts almost the same as `Apache ECharts`. 
+
+Screenshot of common charts, the left part is light theme, the right part is grafana theme.
+
+<p align="center">
+    <img src="./assets/go-charts.png" alt="go-charts">
+</p>
+
+<p align="center">
+    <img src="./assets/go-table.png" alt="go-table">
+</p>
+
+## Chart Type
+
+These chart types are supported: `line`, `bar`, `horizontal bar`, `pie`, `radar` or `funnel` and `table`.
+
+## Example
+
+More examples can be found in the [./examples/](./examples/) directory.
+
+
+### Line Chart
+```go
+package main
+
+import (
+	charts "git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := [][]float64{
+		{
+			120,
+			132,
+			101,
+			134,
+			90,
+			230,
+			210,
+		},
+		{
+			// snip...
+		},
+		{
+			// snip...
+		},
+		{
+			// snip...
+		},
+		{
+			// snip...
+		},
+	}
+	p, err := charts.LineRender(
+		values,
+		charts.TitleTextOptionFunc("Line"),
+		charts.XAxisDataOptionFunc([]string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"Email",
+			"Union Ads",
+			"Video Ads",
+			"Direct",
+			"Search Engine",
+		}, charts.PositionCenter),
+	)
+
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Bar Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := [][]float64{
+		{
+			2.0,
+			4.9,
+			7.0,
+			23.2,
+			25.6,
+			76.7,
+			135.6,
+			162.2,
+			32.6,
+			20.0,
+			6.4,
+			3.3,
+		},
+		{
+			// snip...	
+		},
+	}
+	p, err := charts.BarRender(
+		values,
+		charts.XAxisDataOptionFunc([]string{
+			"Jan",
+			"Feb",
+			"Mar",
+			"Apr",
+			"May",
+			"Jun",
+			"Jul",
+			"Aug",
+			"Sep",
+			"Oct",
+			"Nov",
+			"Dec",
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"Rainfall",
+			"Evaporation",
+		}, charts.PositionRight),
+		charts.MarkLineOptionFunc(0, charts.SeriesMarkDataTypeAverage),
+		charts.MarkPointOptionFunc(0, charts.SeriesMarkDataTypeMax,
+			charts.SeriesMarkDataTypeMin),
+		// custom option func
+		func(opt *charts.ChartOption) {
+			opt.SeriesList[1].MarkPoint = charts.NewMarkPoint(
+				charts.SeriesMarkDataTypeMax,
+				charts.SeriesMarkDataTypeMin,
+			)
+			opt.SeriesList[1].MarkLine = charts.NewMarkLine(
+				charts.SeriesMarkDataTypeAverage,
+			)
+		},
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Horizontal Bar Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := [][]float64{
+		{
+			18203,
+			23489,
+			29034,
+			104970,
+			131744,
+			630230,
+		},
+		{
+			// snip...	
+		},
+	}
+	p, err := charts.HorizontalBarRender(
+		values,
+		charts.TitleTextOptionFunc("World Population"),
+		charts.PaddingOptionFunc(charts.Box{
+			Top:    20,
+			Right:  40,
+			Bottom: 20,
+			Left:   20,
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"2011",
+			"2012",
+		}),
+		charts.YAxisDataOptionFunc([]string{
+			"Brazil",
+			"Indonesia",
+			"USA",
+			"India",
+			"China",
+			"World",
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Pie Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := []float64{
+		1048,
+		735,
+		580,
+		484,
+		300,
+	}
+	p, err := charts.PieRender(
+		values,
+		charts.TitleOptionFunc(charts.TitleOption{
+			Text:    "Rainfall vs Evaporation",
+			Subtext: "Fake Data",
+			Left:    charts.PositionCenter,
+		}),
+		charts.PaddingOptionFunc(charts.Box{
+			Top:    20,
+			Right:  20,
+			Bottom: 20,
+			Left:   20,
+		}),
+		charts.LegendOptionFunc(charts.LegendOption{
+			Orient: charts.OrientVertical,
+			Data: []string{
+				"Search Engine",
+				"Direct",
+				"Email",
+				"Union Ads",
+				"Video Ads",
+			},
+			Left: charts.PositionLeft,
+		}),
+		charts.PieSeriesShowLabel(),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...	
+}
+```
+
+### Radar Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := [][]float64{
+		{
+			4200,
+			3000,
+			20000,
+			35000,
+			50000,
+			18000,
+		},
+		{
+			// snip...
+		},
+	}
+	p, err := charts.RadarRender(
+		values,
+		charts.TitleTextOptionFunc("Basic Radar Chart"),
+		charts.LegendLabelsOptionFunc([]string{
+			"Allocated Budget",
+			"Actual Spending",
+		}),
+		charts.RadarIndicatorOptionFunc([]string{
+			"Sales",
+			"Administration",
+			"Information Technology",
+			"Customer Support",
+			"Development",
+			"Marketing",
+		}, []float64{
+			6500,
+			16000,
+			30000,
+			38000,
+			52000,
+			25000,
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Funnel Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := []float64{
+		100,
+		80,
+		60,
+		40,
+		20,
+	}
+	p, err := charts.FunnelRender(
+		values,
+		charts.TitleTextOptionFunc("Funnel"),
+		charts.LegendLabelsOptionFunc([]string{
+			"Show",
+			"Click",
+			"Visit",
+			"Inquiry",
+			"Order",
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Table
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	header := []string{
+		"Name",
+		"Age",
+		"Address",
+		"Tag",
+		"Action",
+	}
+	data := [][]string{
+		{
+			"John Brown",
+			"32",
+			"New York No. 1 Lake Park",
+			"nice, developer",
+			"Send Mail",
+		},
+		{
+			"Jim Green	",
+			"42",
+			"London No. 1 Lake Park",
+			"wow",
+			"Send Mail",
+		},
+		{
+			"Joe Black	",
+			"32",
+			"Sidney No. 1 Lake Park",
+			"cool, teacher",
+			"Send Mail",
+		},
+	}
+	spans := map[int]int{
+		0: 2,
+		1: 1,
+		// 设置第三列的span
+		2: 3,
+		3: 2,
+		4: 2,
+	}
+	p, err := charts.TableRender(
+		header,
+		data,
+		spans,
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### ECharts Render
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	buf, err := charts.RenderEChartsToPNG(`{
+		"title": {
+			"text": "Line"
+		},
+		"xAxis": {
+			"data": ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
+		},
+		"series": [
+			{
+				"data": [150, 230, 224, 218, 135, 147, 260]
+			}
+		]
+	}`)
+	// snip...
+}
+```
+
+## ECharts Option
+
+The name with `[]` is new parameter, others are the same as `echarts`.
+
+- `[type]` The canvas type, support `svg` and `png`, default is `svg`
+- `[theme]` The theme, support `dark`, `light` and `grafana`, default is `light`
+- `[fontFamily]` The font family for chart
+- `[padding]` The padding of chart
+- `[box]` The canvas box of chart
+- `[width]` The width of chart
+- `[height]` The height of chart
+- `title` Title component, including main title and subtitle
+  - `title.text` The main title text, supporting for \n for newlines
+  - `title.subtext`Subtitle text, supporting for \n for newlines
+  - `title.left` Distance between title component and the left side of the container. Left value can be instant pixel value like 20; it can also be a percentage value relative to container width like '20%'; and it can also be 'left', 'center', or 'right'.
+  - `title.top` Distance between title component and the top side of the container. Top value can be instant pixel value like 20
+  - `title.textStyle.color` Text color for title
+  - `title.textStyle.fontSize` Text font size for title 
+  - `title.textStyle.fontFamily` Text font family for title, it will change the font family for chart
+- `xAxis` The x axis in cartesian(rectangular) coordinate. `go-charts` only support one x axis.
+  - `xAxis.boundaryGap` The boundary gap on both sides of a coordinate axis. The setting and behavior of category axes and non-category axes are different. If set `null` or `true`, the label appear in the center part of two axis ticks.
+  - `xAxis.splitNumber` Number of segments that the axis is split into. Note that this number serves only as a recommendation, and the true segments may be adjusted based on readability
+  - `xAxis.data` Category data, only support string array.
+- `yAxis` The y axis in cartesian(rectangular) coordinate, it support 2 y axis
+  - `yAxis.min` The minimum value of axis. It will be automatically computed to make sure axis tick is equally distributed when not set
+  - `yAxis.max` The maximum value of axis. It will be automatically computed to make sure axis tick is equally distributed when not se.
+  - `yAxis.axisLabel.formatter` Formatter of axis label, which supports string template: `"formatter": "{value} kg"`
+  - `yAxis.axisLine.lineStyle.color` The color for line
+- `legend` Legend component
+  - `legend.show` Whether to show legend
+  - `legend.data` Data array of legend, only support string array: ["Email", "Video Ads"]
+  - `legend.align` Legend marker and text aligning. Support `left` and `right`, default is `left`
+  - `legend.padding` legend space around content
+  - `legend.left` Distance between legend component and the left side of the container. Left value can be instant pixel value like 20; it can also be a percentage value relative to container width like '20%'; and it can also be 'left', 'center', or 'right'.
+  - `legend.top` Distance between legend component and the top side of the container. Top value can be instant pixel value like 20
+- `radar` Coordinate for radar charts
+  - `radar.indicator` Indicator of radar chart, which is used to assign multiple variables(dimensions) in radar chart
+    - `radar.indicator.name` Indicator's name
+    - `radar.indicator.max` The maximum value of indicator
+    - `radar.indicator.min` The minimum value of indicator, default value is 0.
+- `series` The series for chart 
+  - `series.name` Series name used for displaying in legend.
+  - `series.type` Series type: `line`, `bar`, `pie`, `radar` or `funnel`
+  - `series.radius` Radius of Pie chart:`50%`, default is `40%`
+  - `series.yAxisIndex` Index of y axis to combine with, which is useful for multiple y axes in one chart
+  - `series.label.show` Whether to show label
+  - `series.label.distance` Distance to the host graphic element
+  - `series.label.color` Label color
+  - `series.itemStyle.color` Color for the series's item 
+  - `series.markPoint` Mark point in a chart.
+  - `series.markPoint.symbolSize` Symbol size, default is `30` 
+  - `series.markPoint.data` Data array for mark points, each of which is an object and the type only support `max` and `min`: `[{"type": "max"}, {"type": "min"}]`
+  - `series.markLine` Mark line in a chart
+  - `series.markPoint.data`  Data array for mark points, each of which is an object and the type only support `max`, `min` and `average`: `[{"type": "max"}, {"type": "min"}, {"type": "average"}]``
+  - `series.data` Data array of series, which can be in the following forms:
+    - `value` It's a float array: [1.1, 2,3, 5.2]
+    - `object` It's a object value array: [{"value": 1048, "name": "Search Engine"},{"value": 735,"name": "Direct"}]
+- `[children]` The options of children chart
+
+
+## Performance
+
+Generate a png chart will be less than 20ms. It's better than using `chrome headless` with `echarts`.
+
+```bash
+BenchmarkMultiChartPNGRender-8                78          15216336 ns/op         2298308 B/op       1148 allocs/op
+BenchmarkMultiChartSVGRender-8               367           3356325 ns/op        20597282 B/op       3088 allocs/op
+```

README_zh.md

@@ -0,0 +1,576 @@
+# go-charts
+
+[![license](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/vicanso/go-charts/blob/master/LICENSE)
+[![Build Status](https://github.com/vicanso/go-charts/workflows/Test/badge.svg)](https://github.com/vicanso/go-charts/actions)
+
+`go-charts`基于[go-chart](https://github.com/wcharczuk/go-chart)，更简单方便的形式生成数据图表，支持`svg`与`png`两种方式的输出，支持主题`light`, `dark`, `grafana`以及`ant`。默认的输入格式为`png`，默认主题为`light`。
+
+`Apache ECharts`在前端开发中得到众多开发者的认可，因此`go-charts`提供了兼容`Apache ECharts`的配置参数，简单快捷的生成相似的图表(`svg`或`png`)，方便插入至Email或分享使用。下面为常用的图表截图(主题为light与grafana)：
+
+
+<p align="center">
+    <img src="./assets/go-charts.png" alt="go-charts">
+</p>
+
+<p align="center">
+    <img src="./assets/go-table.png" alt="go-table">
+</p
+
+## 支持图表类型
+
+支持以下的图表类型：`line`, `bar`,  `horizontal bar`, `pie`, `radar`, `funnel` 以及 `table`
+
+
+## 示例
+
+
+下面的示例为`go-charts`两种方式的参数配置：golang的参数配置、echarts的JSON配置，输出相同的折线图。
+更多的示例参考：[./examples/](./examples/)目录
+
+### Line Chart
+```go
+package main
+
+import (
+	charts "git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := [][]float64{
+		{
+			120,
+			132,
+			101,
+			134,
+			90,
+			230,
+			210,
+		},
+		{
+			// snip...
+		},
+		{
+			// snip...
+		},
+		{
+			// snip...
+		},
+		{
+			// snip...
+		},
+	}
+	p, err := charts.LineRender(
+		values,
+		charts.TitleTextOptionFunc("Line"),
+		charts.XAxisDataOptionFunc([]string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"Email",
+			"Union Ads",
+			"Video Ads",
+			"Direct",
+			"Search Engine",
+		}, charts.PositionCenter),
+	)
+
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Bar Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := [][]float64{
+		{
+			2.0,
+			4.9,
+			7.0,
+			23.2,
+			25.6,
+			76.7,
+			135.6,
+			162.2,
+			32.6,
+			20.0,
+			6.4,
+			3.3,
+		},
+		{
+			// snip...	
+		},
+	}
+	p, err := charts.BarRender(
+		values,
+		charts.XAxisDataOptionFunc([]string{
+			"Jan",
+			"Feb",
+			"Mar",
+			"Apr",
+			"May",
+			"Jun",
+			"Jul",
+			"Aug",
+			"Sep",
+			"Oct",
+			"Nov",
+			"Dec",
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"Rainfall",
+			"Evaporation",
+		}, charts.PositionRight),
+		charts.MarkLineOptionFunc(0, charts.SeriesMarkDataTypeAverage),
+		charts.MarkPointOptionFunc(0, charts.SeriesMarkDataTypeMax,
+			charts.SeriesMarkDataTypeMin),
+		// custom option func
+		func(opt *charts.ChartOption) {
+			opt.SeriesList[1].MarkPoint = charts.NewMarkPoint(
+				charts.SeriesMarkDataTypeMax,
+				charts.SeriesMarkDataTypeMin,
+			)
+			opt.SeriesList[1].MarkLine = charts.NewMarkLine(
+				charts.SeriesMarkDataTypeAverage,
+			)
+		},
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Horizontal Bar Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := [][]float64{
+		{
+			18203,
+			23489,
+			29034,
+			104970,
+			131744,
+			630230,
+		},
+		{
+			// snip...	
+		},
+	}
+	p, err := charts.HorizontalBarRender(
+		values,
+		charts.TitleTextOptionFunc("World Population"),
+		charts.PaddingOptionFunc(charts.Box{
+			Top:    20,
+			Right:  40,
+			Bottom: 20,
+			Left:   20,
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"2011",
+			"2012",
+		}),
+		charts.YAxisDataOptionFunc([]string{
+			"Brazil",
+			"Indonesia",
+			"USA",
+			"India",
+			"China",
+			"World",
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Pie Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := []float64{
+		1048,
+		735,
+		580,
+		484,
+		300,
+	}
+	p, err := charts.PieRender(
+		values,
+		charts.TitleOptionFunc(charts.TitleOption{
+			Text:    "Rainfall vs Evaporation",
+			Subtext: "Fake Data",
+			Left:    charts.PositionCenter,
+		}),
+		charts.PaddingOptionFunc(charts.Box{
+			Top:    20,
+			Right:  20,
+			Bottom: 20,
+			Left:   20,
+		}),
+		charts.LegendOptionFunc(charts.LegendOption{
+			Orient: charts.OrientVertical,
+			Data: []string{
+				"Search Engine",
+				"Direct",
+				"Email",
+				"Union Ads",
+				"Video Ads",
+			},
+			Left: charts.PositionLeft,
+		}),
+		charts.PieSeriesShowLabel(),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...	
+}
+```
+
+### Radar Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := [][]float64{
+		{
+			4200,
+			3000,
+			20000,
+			35000,
+			50000,
+			18000,
+		},
+		{
+			// snip...
+		},
+	}
+	p, err := charts.RadarRender(
+		values,
+		charts.TitleTextOptionFunc("Basic Radar Chart"),
+		charts.LegendLabelsOptionFunc([]string{
+			"Allocated Budget",
+			"Actual Spending",
+		}),
+		charts.RadarIndicatorOptionFunc([]string{
+			"Sales",
+			"Administration",
+			"Information Technology",
+			"Customer Support",
+			"Development",
+			"Marketing",
+		}, []float64{
+			6500,
+			16000,
+			30000,
+			38000,
+			52000,
+			25000,
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Funnel Chart
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	values := []float64{
+		100,
+		80,
+		60,
+		40,
+		20,
+	}
+	p, err := charts.FunnelRender(
+		values,
+		charts.TitleTextOptionFunc("Funnel"),
+		charts.LegendLabelsOptionFunc([]string{
+			"Show",
+			"Click",
+			"Visit",
+			"Inquiry",
+			"Order",
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+
+### Table
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	header := []string{
+		"Name",
+		"Age",
+		"Address",
+		"Tag",
+		"Action",
+	}
+	data := [][]string{
+		{
+			"John Brown",
+			"32",
+			"New York No. 1 Lake Park",
+			"nice, developer",
+			"Send Mail",
+		},
+		{
+			"Jim Green	",
+			"42",
+			"London No. 1 Lake Park",
+			"wow",
+			"Send Mail",
+		},
+		{
+			"Joe Black	",
+			"32",
+			"Sidney No. 1 Lake Park",
+			"cool, teacher",
+			"Send Mail",
+		},
+	}
+	spans := map[int]int{
+		0: 2,
+		1: 1,
+		// 设置第三列的span
+		2: 3,
+		3: 2,
+		4: 2,
+	}
+	p, err := charts.TableRender(
+		header,
+		data,
+		spans,
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	// snip...
+}
+```
+### ECharts Render
+
+```go
+package main
+
+import (
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func main() {
+	buf, err := charts.RenderEChartsToPNG(`{
+		"title": {
+			"text": "Line"
+		},
+		"xAxis": {
+			"data": ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
+		},
+		"series": [
+			{
+				"data": [150, 230, 224, 218, 135, 147, 260]
+			}
+		]
+	}`)
+	// snip...
+}
+```
+
+## 常用函数
+
+`go-charts`针对常用的几种图表提供了简单的调用方式以及几种常用的Option设置，便捷的生成常用图表。
+
+- `LineRender`: 折线图表，第一个参数为二维浮点数，对应图表中的点，支持不定长的OptionFunc参数，用于指定其它的属性
+- `BarRender`: 柱状图表，第一个参数为二维浮点数，对应柱状图的高度，支持不定长的OptionFunc参数，用于指定其它的属性
+- `PieRender`: 饼图表，第一个参数为浮点数数组，对应各占比，支持不定长的OptionFunc参数，用于指定其它的属性
+- `RadarRender`: 雷达图，第一个参数为二维浮点数，对应雷达图中的各值，支持不定长的OptionFunc参数，用于指定其它的属性
+- `FunnelRender`: 漏斗图，第一个参数为浮点数数组，对应各占比，支持不定长的OptionFunc参数，用于指定其它的属性
+- `PNGTypeOption`: 指定输出PNG
+- `FontFamilyOptionFunc`: 指定使用的字体
+- `ThemeOptionFunc`: 指定使用的主题类型
+- `TitleOptionFunc`: 指定标题相关属性
+- `LegendOptionFunc`: 指定图例相关属性
+- `XAxisOptionFunc`: 指定x轴的相关属性
+- `YAxisOptionFunc`: 指定y轴的相关属性
+- `WidthOptionFunc`: 指定宽度
+- `HeightOptionFunc`: 指定高度
+- `PaddingOptionFunc`: 指定空白填充区域
+- `BoxOptionFunc`: 指定内容区域
+- `ChildOptionFunc`: 指定子图表
+- `RadarIndicatorOptionFunc`: 雷达图指示器相关属性
+- `BackgroundColorOptionFunc`: 设置背景图颜色
+
+## ECharts参数说明
+
+名称有[]的参数非echarts的原有参数，为`go-charts`的新增参数，可根据实际使用场景添加。
+
+- `[type]` 画布类型，支持`svg`与`png`，默认为`svg`
+- `[theme]` 颜色主题，支持`dark`、`light`以及`grafana`模式，默认为`light`
+- `[fontFamily]` 字体，全局的字体设置
+- `[padding]` 图表的内边距，单位px。支持以下几种模式的设置
+  - `padding: 5` 设置内边距为5
+  - `padding: [5, 10]` 设置上下的内边距为 5，左右的内边距为 10
+  - `padding:[5, 10, 5, 10]` 分别设置`上右下左`边距
+- `[box]` 图表的区域，以{"left": Int, "right": Int, "top": Int, "bottom": Int}的形式配置
+- `[width]` 画布宽度，默认为600
+- `[height]` 画布高度，默认为400
+- `title` 图表标题，包括标题内容、高度、颜色等
+  - `title.text` 标题文本，支持以`\n`的形式换行
+  - `title.subtext` 副标题文本，支持以`\n`的形式换行
+  - `title.left` 标题与容器左侧的距离，可设置为`left`, `right`, `center`, `20%` 以及 `20` 这样的具体数值
+  - `title.top` 标题与容器顶部的距离，暂仅支持具体数值，如`20`
+  - `title.textStyle.color` 标题文字颜色
+  - `title.textStyle.fontSize` 标题文字字体大小
+  - `title.textStyle.fontFamily` 标题文字的字体系列，需要注意此配置是会影响整个图表的字体
+- `xAxis` 直角坐标系grid中的x轴，由于go-charts仅支持单一个x轴，因此若参数为数组多个x轴，只使用第一个配置
+  - `xAxis.boundaryGap` 坐标轴两边留白策略，仅支持三种设置方式`null`, `true`或者`false`。`null`或`true`时则数据点展示在两个刻度中间
+  - `xAxis.splitNumber` 坐标轴的分割段数，需要注意的是这个分割段数只是个预估值，最后实际显示的段数会在这个基础上根据分割后坐标轴刻度显示的易读程度作调整
+  - `xAxis.data` x轴的展示文案，暂只支持字符串数组，如["Mon", "Tue"]，其数量需要与展示点一致
+- `yAxis` 直角坐标系grid中的y轴，最多支持两个y轴
+  - `yAxis.min` 坐标轴刻度最小值，若不设置则自动计算
+  - `yAxis.max` 坐标轴刻度最大值，若不设置则自动计算
+  - `yAxis.axisLabel.formatter` 刻度标签的内容格式器，如`"formatter": "{value} kg"`
+  - `yAxis.axisLine.lineStyle.color` 坐标轴颜色
+- `legend` 图表中不同系列的标记
+  - `legend.show` 图例是否显示，如果不需要展示需要设置为`false`
+  - `legend.data` 图例的数据数组，为字符串数组，如["Email", "Video Ads"]
+  - `legend.align` 图例标记和文本的对齐，可设置为`left`或者`right`，默认为标记靠左`left`
+  - `legend.padding` legend的padding，配置方式与图表的`padding`一致
+  - `legend.left` legend离容器左侧的距离，其值可以为具体的像素值(20)或百分比(20%)、`left`或者`right`
+  - `legend.top` legend离容器顶部的距离，暂仅支持数值形式
+- `radar` 雷达图的坐标系 
+  - `radar.indicator` 雷达图的指示器，用来指定雷达图中的多个变量（维度）
+    - `radar.indicator.name` 指示器名称
+    - `radar.indicator.max` 指示器的最大值，可选，建议设置
+    - `radar.indicator.min` 指示器的最小值，可选，默认为 0
+- `series` 图表的数据项列表
+  - `series.name` 图表的名称，与`legend.data`对应，两者只只设置其一
+  - `series.type` 图表的展示类型，暂支持`line`, `bar`, `pie`, `radar` 以及 `funnel`。需要注意只有`line`与`bar`可以混用
+  - `series.radius` 饼图的半径值，如`50%`，默认为`40%`
+  - `series.yAxisIndex` 该数据项使用的y轴，默认为0，对yAxis的配置对应
+  - `series.label.show` 是否显示文本标签(默认为对应的值)
+  - `series.label.distance` 距离图形元素的距离
+  - `series.label.color` 文本标签的颜色
+  - `series.itemStyle.color` 该数据项展示时使用的颜色
+  - `series.markPoint` 图表的标注配置
+  - `series.markPoint.symbolSize` 标注的大小，默认为30
+  - `series.markPoint.data` 标注类型，仅支持数组形式，其类型只支持`max`与`min`，如：`[{"type": "max"}, {"type": "min"}]
+  - `series.markLine` 图表的标线配置 
+  - `series.markPoint.data` 标线类型，仅支持数组形式，其类型只支持`max`、`min`以及`average`，如：`[{"type": "max"}, {"type": "min"}, {"type": "average"}]
+  - `series.data` 数据项对应的数据数组，支持以下形式的数据：
+    - `数值` 常用形式，数组数据为浮点数组，如[1.1, 2,3, 5.2]
+    - `结构体` pie图表或bar图表中指定样式使用，如[{"value": 1048, "name": "Search Engine"},{"value": 735,"name": "Direct"}]
+- `[children]` 嵌套的子图表参数列表，图表支持嵌套的形式=
+
+## 性能
+
+
+简单的图表生成PNG在20ms左右，而SVG的性能则更快，性能上比起使用`chrome headless`加载`echarts`图表展示页面再截图生成的方式大幅度提升，满足简单的图表生成需求。
+
+```bash
+BenchmarkMultiChartPNGRender-8                78          15216336 ns/op         2298308 B/op       1148 allocs/op
+BenchmarkMultiChartSVGRender-8               367           3356325 ns/op        20597282 B/op       3088 allocs/op
+```
+
+## 中文字符
+
+默认使用的字符为`roboto`为英文字体库，因此如果需要显示中文字符需要增加中文字体库，`InstallFont`函数可添加对应的字体库，成功添加之后则指定`title.textStyle.fontFamily`即可。
+在浏览器中使用`svg`时，如果指定的`fontFamily`不支持中文字符，展示的中文并不会乱码，但是会导致在计算字符宽度等错误。
+
+字体文件可以在[中文字库noto-cjk](https://github.com/googlefonts/noto-cjk)下载，注意下载时选择字体格式为 `ttf` 格式，如果选用 `otf` 格式可能会加载失败，字体尽量选择Bold类型，否则生成的图片会有点模糊。
+
+
+示例见 [examples/chinese/main.go](examples/chinese/main.go)
+

alias.go

@@ -0,0 +1,73 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"git.smarteching.com/zeni/go-chart/v2"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+type Box = chart.Box
+type Style = chart.Style
+type Color = drawing.Color
+
+var BoxZero = chart.BoxZero
+
+type Point struct {
+	X int
+	Y int
+}
+
+const (
+	ChartTypeLine   = "line"
+	ChartTypeBar    = "bar"
+	ChartTypePie    = "pie"
+	ChartTypeRadar  = "radar"
+	ChartTypeFunnel = "funnel"
+	// horizontal bar
+	ChartTypeHorizontalBar = "horizontalBar"
+)
+
+const (
+	ChartOutputSVG = "svg"
+	ChartOutputPNG = "png"
+)
+
+const (
+	PositionLeft   = "left"
+	PositionRight  = "right"
+	PositionCenter = "center"
+	PositionTop    = "top"
+	PositionBottom = "bottom"
+)
+
+const (
+	AlignLeft   = "left"
+	AlignRight  = "right"
+	AlignCenter = "center"
+)
+
+const (
+	OrientHorizontal = "horizontal"
+	OrientVertical   = "vertical"
+)

axis.go

@@ -0,0 +1,339 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"strings"
+
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+type axisPainter struct {
+	p   *Painter
+	opt *AxisOption
+}
+
+func NewAxisPainter(p *Painter, opt AxisOption) *axisPainter {
+	return &axisPainter{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+type AxisOption struct {
+	// The theme of chart
+	Theme ColorPalette
+	// Formatter for y axis text value
+	Formatter string
+	// The label of axis
+	Data []string
+	// The boundary gap on both sides of a coordinate axis.
+	// Nil or *true means the center part of two axis ticks
+	BoundaryGap *bool
+	// The flag for show axis, set this to *false will hide axis
+	Show *bool
+	// The position of axis, it can be 'left', 'top', 'right' or 'bottom'
+	Position string
+	// Number of segments that the axis is split into. Note that this number serves only as a recommendation.
+	SplitNumber int
+	// The line color of axis
+	StrokeColor Color
+	// The line width
+	StrokeWidth float64
+	// The length of the axis tick
+	TickLength int
+	// The first axis
+	FirstAxis int
+	// The margin value of label
+	LabelMargin int
+	// The font size of label
+	FontSize float64
+	// The font of label
+	Font *truetype.Font
+	// The color of label
+	FontColor Color
+	// The flag for show axis split line, set this to true will show axis split line
+	SplitLineShow bool
+	// The color of split line
+	SplitLineColor Color
+	// The text rotation of label
+	TextRotation float64
+	// The offset of label
+	LabelOffset Box
+	Unit        int
+}
+
+func (a *axisPainter) Render() (Box, error) {
+	opt := a.opt
+	top := a.p
+	theme := opt.Theme
+	if theme == nil {
+		theme = top.theme
+	}
+	if isFalse(opt.Show) {
+		return BoxZero, nil
+	}
+
+	strokeWidth := opt.StrokeWidth
+	if strokeWidth == 0 {
+		strokeWidth = 1
+	}
+
+	font := opt.Font
+	if font == nil {
+		font = a.p.font
+	}
+	if font == nil {
+		font = theme.GetFont()
+	}
+	fontColor := opt.FontColor
+	if fontColor.IsZero() {
+		fontColor = theme.GetTextColor()
+	}
+	fontSize := opt.FontSize
+	if fontSize == 0 {
+		fontSize = theme.GetFontSize()
+	}
+	strokeColor := opt.StrokeColor
+	if strokeColor.IsZero() {
+		strokeColor = theme.GetAxisStrokeColor()
+	}
+
+	data := opt.Data
+	formatter := opt.Formatter
+	if len(formatter) != 0 {
+		for index, text := range data {
+			data[index] = strings.ReplaceAll(formatter, "{value}", text)
+		}
+	}
+	dataCount := len(data)
+	tickCount := dataCount
+
+	boundaryGap := true
+	if isFalse(opt.BoundaryGap) {
+		boundaryGap = false
+	}
+	isVertical := opt.Position == PositionLeft ||
+		opt.Position == PositionRight
+
+	labelPosition := ""
+	if !boundaryGap {
+		tickCount--
+		labelPosition = PositionLeft
+	}
+	if isVertical && boundaryGap {
+		labelPosition = PositionCenter
+	}
+
+	// 如果小于0，则表示不处理
+	tickLength := getDefaultInt(opt.TickLength, 5)
+	labelMargin := getDefaultInt(opt.LabelMargin, 5)
+
+	style := Style{
+		StrokeColor: strokeColor,
+		StrokeWidth: strokeWidth,
+		Font:        font,
+		FontColor:   fontColor,
+		FontSize:    fontSize,
+	}
+	top.SetDrawingStyle(style).OverrideTextStyle(style)
+
+	isTextRotation := opt.TextRotation != 0
+
+	if isTextRotation {
+		top.SetTextRotation(opt.TextRotation)
+	}
+	textMaxWidth, textMaxHeight := top.MeasureTextMaxWidthHeight(data)
+	if isTextRotation {
+		top.ClearTextRotation()
+	}
+
+	// 增加30px来计算文本展示区域
+	textFillWidth := float64(textMaxWidth + 20)
+	// 根据文本宽度计算较为符合的展示项
+	fitTextCount := ceilFloatToInt(float64(top.Width()) / textFillWidth)
+
+	unit := opt.Unit
+	if unit <= 0 {
+
+		unit = ceilFloatToInt(float64(dataCount) / float64(fitTextCount))
+		unit = chart.MaxInt(unit, opt.SplitNumber)
+		// 偶数
+		if unit%2 == 0 && dataCount%(unit+1) == 0 {
+			unit++
+		}
+	}
+
+	width := 0
+	height := 0
+	// 垂直
+	if isVertical {
+		width = textMaxWidth + tickLength<<1
+		height = top.Height()
+	} else {
+		width = top.Width()
+		height = tickLength<<1 + textMaxHeight
+	}
+	padding := Box{}
+	switch opt.Position {
+	case PositionTop:
+		padding.Top = top.Height() - height
+	case PositionLeft:
+		padding.Right = top.Width() - width
+	case PositionRight:
+		padding.Left = top.Width() - width
+	default:
+		padding.Top = top.Height() - defaultXAxisHeight
+	}
+
+	p := top.Child(PainterPaddingOption(padding))
+
+	x0 := 0
+	y0 := 0
+	x1 := 0
+	y1 := 0
+	ticksPaddingTop := 0
+	ticksPaddingLeft := 0
+	labelPaddingTop := 0
+	labelPaddingLeft := 0
+	labelPaddingRight := 0
+	orient := ""
+	textAlign := ""
+
+	switch opt.Position {
+	case PositionTop:
+		labelPaddingTop = 0
+		x1 = p.Width()
+		y0 = labelMargin + int(opt.FontSize)
+		ticksPaddingTop = int(opt.FontSize)
+		y1 = y0
+		orient = OrientHorizontal
+	case PositionLeft:
+		x0 = p.Width()
+		y0 = 0
+		x1 = p.Width()
+		y1 = p.Height()
+		orient = OrientVertical
+		textAlign = AlignRight
+		ticksPaddingLeft = textMaxWidth + tickLength
+		labelPaddingRight = width - textMaxWidth
+	case PositionRight:
+		orient = OrientVertical
+		y1 = p.Height()
+		labelPaddingLeft = width - textMaxWidth
+	default:
+		labelPaddingTop = height
+		x1 = p.Width()
+		orient = OrientHorizontal
+	}
+
+	if strokeWidth > 0 {
+		p.Child(PainterPaddingOption(Box{
+			Top:  ticksPaddingTop,
+			Left: ticksPaddingLeft,
+		})).Ticks(TicksOption{
+			Count:  tickCount,
+			Length: tickLength,
+			Unit:   unit,
+			Orient: orient,
+			First:  opt.FirstAxis,
+		})
+		p.LineStroke([]Point{
+			{
+				X: x0,
+				Y: y0,
+			},
+			{
+				X: x1,
+				Y: y1,
+			},
+		})
+	}
+
+	p.Child(PainterPaddingOption(Box{
+		Left:  labelPaddingLeft,
+		Top:   labelPaddingTop,
+		Right: labelPaddingRight,
+	})).MultiText(MultiTextOption{
+		First:        opt.FirstAxis,
+		Align:        textAlign,
+		TextList:     data,
+		Orient:       orient,
+		Unit:         unit,
+		Position:     labelPosition,
+		TextRotation: opt.TextRotation,
+		Offset:       opt.LabelOffset,
+	})
+	// 显示辅助线
+	if opt.SplitLineShow {
+		style.StrokeColor = opt.SplitLineColor
+		style.StrokeWidth = 1
+		top.OverrideDrawingStyle(style)
+		if isVertical {
+			x0 := p.Width()
+			x1 := top.Width()
+			if opt.Position == PositionRight {
+				x0 = 0
+				x1 = top.Width() - p.Width()
+			}
+			yValues := autoDivide(height, tickCount)
+			yValues = yValues[0 : len(yValues)-1]
+			for _, y := range yValues {
+				top.LineStroke([]Point{
+					{
+						X: x0,
+						Y: y,
+					},
+					{
+						X: x1,
+						Y: y,
+					},
+				})
+			}
+		} else {
+			y0 := p.Height() - defaultXAxisHeight
+			y1 := top.Height() - defaultXAxisHeight
+			for index, x := range autoDivide(width, tickCount) {
+				if index == 0 {
+					continue
+				}
+				top.LineStroke([]Point{
+					{
+						X: x,
+						Y: y0,
+					},
+					{
+						X: x,
+						Y: y1,
+					},
+				})
+			}
+		}
+	}
+
+	return Box{
+		Bottom: height,
+		Right:  width,
+	}, nil
+}

axis_test.go

@@ -0,0 +1,173 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+func TestAxis(t *testing.T) {
+	assert := assert.New(t)
+	tests := []struct {
+		render func(*Painter) ([]byte, error)
+		result string
+	}{
+		// 底部x轴
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, _ = NewAxisPainter(p, AxisOption{
+					Data: []string{
+						"Mon",
+						"Tue",
+						"Wed",
+						"Thu",
+						"Fri",
+						"Sat",
+						"Sun",
+					},
+					SplitLineShow:  true,
+					SplitLineColor: drawing.ColorBlack,
+				}).Render()
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 0 375\nL 0 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 85 375\nL 85 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 171 375\nL 171 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 257 375\nL 257 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 342 375\nL 342 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 428 375\nL 428 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 514 375\nL 514 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 600 375\nL 600 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 0 370\nL 600 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><text x=\"27\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Mon</text><text x=\"115\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Tue</text><text x=\"199\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Wed</text><text x=\"286\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Thu</text><text x=\"376\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Fri</text><text x=\"460\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sat</text><text x=\"544\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sun</text><path  d=\"M 85 0\nL 85 370\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 171 0\nL 171 370\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 257 0\nL 257 370\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 342 0\nL 342 370\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 428 0\nL 428 370\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 514 0\nL 514 370\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 600 0\nL 600 370\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/></svg>",
+		},
+		// 底部x轴文本居左
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, _ = NewAxisPainter(p, AxisOption{
+					Data: []string{
+						"Mon",
+						"Tue",
+						"Wed",
+						"Thu",
+						"Fri",
+						"Sat",
+						"Sun",
+					},
+					BoundaryGap: FalseFlag(),
+				}).Render()
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 0 375\nL 0 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 100 375\nL 100 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 200 375\nL 200 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 300 375\nL 300 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 400 375\nL 400 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 500 375\nL 500 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 600 375\nL 600 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 0 370\nL 600 370\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><text x=\"-15\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Mon</text><text x=\"87\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Tue</text><text x=\"185\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Wed</text><text x=\"287\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Thu</text><text x=\"391\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Fri</text><text x=\"489\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sat</text><text x=\"587\" y=\"395\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sun</text></svg>",
+		},
+		// 左侧y轴
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, _ = NewAxisPainter(p, AxisOption{
+					Data: []string{
+						"Mon",
+						"Tue",
+						"Wed",
+						"Thu",
+						"Fri",
+						"Sat",
+						"Sun",
+					},
+					Position: PositionLeft,
+				}).Render()
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 36 0\nL 41 0\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 57\nL 41 57\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 114\nL 41 114\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 171\nL 41 171\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 228\nL 41 228\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 285\nL 41 285\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 342\nL 41 342\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 400\nL 41 400\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 41 0\nL 41 400\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><text x=\"0\" y=\"35\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Mon</text><text x=\"4\" y=\"92\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Tue</text><text x=\"0\" y=\"149\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Wed</text><text x=\"4\" y=\"206\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Thu</text><text x=\"13\" y=\"263\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Fri</text><text x=\"8\" y=\"320\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sat</text><text x=\"4\" y=\"378\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sun</text></svg>",
+		},
+		// 左侧y轴居中
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, _ = NewAxisPainter(p, AxisOption{
+					Data: []string{
+						"Mon",
+						"Tue",
+						"Wed",
+						"Thu",
+						"Fri",
+						"Sat",
+						"Sun",
+					},
+					Position:       PositionLeft,
+					BoundaryGap:    FalseFlag(),
+					SplitLineShow:  true,
+					SplitLineColor: drawing.ColorBlack,
+				}).Render()
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 36 0\nL 41 0\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 66\nL 41 66\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 133\nL 41 133\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 200\nL 41 200\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 266\nL 41 266\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 333\nL 41 333\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 36 400\nL 41 400\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 41 0\nL 41 400\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><text x=\"0\" y=\"7\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Mon</text><text x=\"4\" y=\"73\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Tue</text><text x=\"0\" y=\"140\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Wed</text><text x=\"4\" y=\"207\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Thu</text><text x=\"13\" y=\"273\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Fri</text><text x=\"8\" y=\"340\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sat</text><text x=\"4\" y=\"407\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sun</text><path  d=\"M 41 0\nL 600 0\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 41 66\nL 600 66\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 41 133\nL 600 133\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 41 200\nL 600 200\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 41 266\nL 600 266\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 41 333\nL 600 333\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/></svg>",
+		},
+		// 右侧
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, _ = NewAxisPainter(p, AxisOption{
+					Data: []string{
+						"Mon",
+						"Tue",
+						"Wed",
+						"Thu",
+						"Fri",
+						"Sat",
+						"Sun",
+					},
+					Position:       PositionRight,
+					BoundaryGap:    FalseFlag(),
+					SplitLineShow:  true,
+					SplitLineColor: drawing.ColorBlack,
+				}).Render()
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 559 0\nL 564 0\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 559 66\nL 564 66\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 559 133\nL 564 133\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 559 200\nL 564 200\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 559 266\nL 564 266\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 559 333\nL 564 333\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 559 400\nL 564 400\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 559 0\nL 559 400\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><text x=\"569\" y=\"7\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Mon</text><text x=\"569\" y=\"73\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Tue</text><text x=\"569\" y=\"140\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Wed</text><text x=\"569\" y=\"207\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Thu</text><text x=\"569\" y=\"273\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Fri</text><text x=\"569\" y=\"340\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sat</text><text x=\"569\" y=\"407\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sun</text><path  d=\"M 0 0\nL 559 0\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 66\nL 559 66\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 133\nL 559 133\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 200\nL 559 200\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 266\nL 559 266\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 333\nL 559 333\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/></svg>",
+		},
+		// 顶部
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, _ = NewAxisPainter(p, AxisOption{
+					Data: []string{
+						"Mon",
+						"Tue",
+						"Wed",
+						"Thu",
+						"Fri",
+						"Sat",
+						"Sun",
+					},
+					Formatter: "{value} --",
+					Position:  PositionTop,
+				}).Render()
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 0 380\nL 0 375\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 85 380\nL 85 375\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 171 380\nL 171 375\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 257 380\nL 257 375\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 342 380\nL 342 375\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 428 380\nL 428 375\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 514 380\nL 514 375\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 600 380\nL 600 375\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><path  d=\"M 0 380\nL 600 380\" style=\"stroke-width:1;stroke:rgba(110,112,121,1.0);fill:none\"/><text x=\"20\" y=\"375\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Mon --</text><text x=\"108\" y=\"375\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Tue --</text><text x=\"192\" y=\"375\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Wed --</text><text x=\"279\" y=\"375\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Thu --</text><text x=\"369\" y=\"375\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Fri --</text><text x=\"453\" y=\"375\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sat --</text><text x=\"537\" y=\"375\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sun --</text></svg>",
+		},
+	}
+
+	for _, tt := range tests {
+		p, err := NewPainter(PainterOptions{
+			Type:   ChartOutputSVG,
+			Width:  600,
+			Height: 400,
+		}, PainterThemeOption(defaultTheme))
+		assert.Nil(err)
+		data, err := tt.render(p)
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}

bar_chart.go

@@ -0,0 +1,253 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"math"
+
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+type barChart struct {
+	p   *Painter
+	opt *BarChartOption
+}
+
+// NewBarChart returns a bar chart renderer
+func NewBarChart(p *Painter, opt BarChartOption) *barChart {
+	if opt.Theme == nil {
+		opt.Theme = defaultTheme
+	}
+	return &barChart{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+type BarChartOption struct {
+	// The theme
+	Theme ColorPalette
+	// The font size
+	Font *truetype.Font
+	// The data series list
+	SeriesList SeriesList
+	// The x axis option
+	XAxis XAxisOption
+	// The padding of line chart
+	Padding Box
+	// The y axis option
+	YAxisOptions []YAxisOption
+	// The option of title
+	Title TitleOption
+	// The legend option
+	Legend   LegendOption
+	BarWidth int
+	// Margin of bar
+	BarMargin int
+}
+
+func (b *barChart) render(result *defaultRenderResult, seriesList SeriesList) (Box, error) {
+	p := b.p
+	opt := b.opt
+	seriesPainter := result.seriesPainter
+
+	xRange := NewRange(AxisRangeOption{
+		Painter:     b.p,
+		DivideCount: len(opt.XAxis.Data),
+		Size:        seriesPainter.Width(),
+	})
+	x0, x1 := xRange.GetRange(0)
+	width := int(x1 - x0)
+	// 每一块之间的margin
+	margin := 10
+	// 每一个bar之间的margin
+	barMargin := 5
+	if width < 20 {
+		margin = 2
+		barMargin = 2
+	} else if width < 50 {
+		margin = 5
+		barMargin = 3
+	}
+	if opt.BarMargin > 0 {
+		barMargin = opt.BarMargin
+	}
+	seriesCount := len(seriesList)
+	// 总的宽度-两个margin-(总数-1)的barMargin
+	barWidth := (width - 2*margin - barMargin*(seriesCount-1)) / seriesCount
+	if opt.BarWidth > 0 && opt.BarWidth < barWidth {
+		barWidth = opt.BarWidth
+		// 重新计算margin
+		margin = (width - seriesCount*barWidth - barMargin*(seriesCount-1)) / 2
+	}
+	barMaxHeight := seriesPainter.Height()
+	theme := opt.Theme
+	seriesNames := seriesList.Names()
+
+	markPointPainter := NewMarkPointPainter(seriesPainter)
+	markLinePainter := NewMarkLinePainter(seriesPainter)
+	rendererList := []Renderer{
+		markPointPainter,
+		markLinePainter,
+	}
+	for index := range seriesList {
+		series := seriesList[index]
+		yRange := result.axisRanges[series.AxisIndex]
+		seriesColor := theme.GetSeriesColor(series.index)
+
+		divideValues := xRange.AutoDivide()
+		points := make([]Point, len(series.Data))
+		var labelPainter *SeriesLabelPainter
+		if series.Label.Show {
+			labelPainter = NewSeriesLabelPainter(SeriesLabelPainterParams{
+				P:           seriesPainter,
+				SeriesNames: seriesNames,
+				Label:       series.Label,
+				Theme:       opt.Theme,
+				Font:        opt.Font,
+			})
+			rendererList = append(rendererList, labelPainter)
+		}
+
+		for j, item := range series.Data {
+			if j >= xRange.divideCount {
+				continue
+			}
+			x := divideValues[j]
+			x += margin
+			if index != 0 {
+				x += index * (barWidth + barMargin)
+			}
+
+			h := int(yRange.getHeight(item.Value))
+			fillColor := seriesColor
+			if !item.Style.FillColor.IsZero() {
+				fillColor = item.Style.FillColor
+			}
+			top := barMaxHeight - h
+
+			if series.RoundRadius <= 0 {
+				seriesPainter.OverrideDrawingStyle(Style{
+					FillColor: fillColor,
+				}).Rect(chart.Box{
+					Top:    top,
+					Left:   x,
+					Right:  x + barWidth,
+					Bottom: barMaxHeight - 1,
+				})
+			} else {
+				seriesPainter.OverrideDrawingStyle(Style{
+					FillColor: fillColor,
+				}).RoundedRect(chart.Box{
+					Top:    top,
+					Left:   x,
+					Right:  x + barWidth,
+					Bottom: barMaxHeight - 1,
+				}, series.RoundRadius)
+			}
+			// 用于生成marker point
+			points[j] = Point{
+				// 居中的位置
+				X: x + barWidth>>1,
+				Y: top,
+			}
+			// 用于生成marker point
+			points[j] = Point{
+				// 居中的位置
+				X: x + barWidth>>1,
+				Y: top,
+			}
+			// 如果label不需要展示，则返回
+			if labelPainter == nil {
+				continue
+			}
+			y := barMaxHeight - h
+			radians := float64(0)
+			fontColor := series.Label.Color
+			if series.Label.Position == PositionBottom {
+				y = barMaxHeight
+				radians = -math.Pi / 2
+				if fontColor.IsZero() {
+					if isLightColor(fillColor) {
+						fontColor = defaultLightFontColor
+					} else {
+						fontColor = defaultDarkFontColor
+					}
+				}
+			}
+			labelPainter.Add(LabelValue{
+				Index: index,
+				Value: item.Value,
+				X:     x + barWidth>>1,
+				Y:     y,
+				// 旋转
+				Radians:   radians,
+				FontColor: fontColor,
+				Offset:    series.Label.Offset,
+				FontSize:  series.Label.FontSize,
+			})
+		}
+
+		markPointPainter.Add(markPointRenderOption{
+			FillColor: seriesColor,
+			Font:      opt.Font,
+			Series:    series,
+			Points:    points,
+		})
+		markLinePainter.Add(markLineRenderOption{
+			FillColor:   seriesColor,
+			FontColor:   opt.Theme.GetTextColor(),
+			StrokeColor: seriesColor,
+			Font:        opt.Font,
+			Series:      series,
+			Range:       yRange,
+		})
+	}
+	// 最大、最小的mark point
+	err := doRender(rendererList...)
+	if err != nil {
+		return BoxZero, err
+	}
+
+	return p.box, nil
+}
+
+func (b *barChart) Render() (Box, error) {
+	p := b.p
+	opt := b.opt
+	renderResult, err := defaultRender(p, defaultRenderOption{
+		Theme:        opt.Theme,
+		Padding:      opt.Padding,
+		SeriesList:   opt.SeriesList,
+		XAxis:        opt.XAxis,
+		YAxisOptions: opt.YAxisOptions,
+		TitleOption:  opt.Title,
+		LegendOption: opt.Legend,
+	})
+	if err != nil {
+		return BoxZero, err
+	}
+	seriesList := opt.SeriesList.Filter(ChartTypeLine)
+	return b.render(renderResult, seriesList)
+}

chart_option.go

@@ -0,0 +1,426 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"sort"
+
+	"github.com/golang/freetype/truetype"
+)
+
+type ChartOption struct {
+	theme ColorPalette
+	font  *truetype.Font
+	// The output type of chart, "svg" or "png", default value is "svg"
+	Type string
+	// The font family, which should be installed first
+	FontFamily string
+	// The theme of chart, "light" and "dark".
+	// The default theme is "light"
+	Theme string
+	// The title option
+	Title TitleOption
+	// The legend option
+	Legend LegendOption
+	// The x axis option
+	XAxis XAxisOption
+	// The y axis option list
+	YAxisOptions []YAxisOption
+	// The width of chart, default width is 600
+	Width int
+	// The height of chart, default height is 400
+	Height int
+	Parent *Painter
+	// The padding for chart, default padding is [20, 10, 10, 10]
+	Padding Box
+	// The canvas box for chart
+	Box Box
+	// The series list
+	SeriesList SeriesList
+	// The radar indicator list
+	RadarIndicators []RadarIndicator
+	// The background color of chart
+	BackgroundColor Color
+	// The flag for show symbol of line, set this to *false will hide symbol
+	SymbolShow *bool
+	// The stroke width of line chart
+	LineStrokeWidth float64
+	// The bar with of bar chart
+	BarWidth int
+	// The margin of each bar
+	BarMargin int
+	// The bar height of horizontal bar chart
+	BarHeight int
+	// Fill the area of line chart
+	FillArea bool
+	// background fill (alpha) opacity
+	Opacity uint8
+	// The child charts
+	Children []ChartOption
+	// The value formatter
+	ValueFormatter ValueFormatter
+}
+
+// OptionFunc option function
+type OptionFunc func(opt *ChartOption)
+
+// SVGTypeOption set svg type of chart's output
+func SVGTypeOption() OptionFunc {
+	return TypeOptionFunc(ChartOutputSVG)
+}
+
+// PNGTypeOption set png type of chart's output
+func PNGTypeOption() OptionFunc {
+	return TypeOptionFunc(ChartOutputPNG)
+}
+
+// TypeOptionFunc set type of chart's output
+func TypeOptionFunc(t string) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Type = t
+	}
+}
+
+// FontFamilyOptionFunc set font family of chart
+func FontFamilyOptionFunc(fontFamily string) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.FontFamily = fontFamily
+	}
+}
+
+// ThemeOptionFunc set them of chart
+func ThemeOptionFunc(theme string) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Theme = theme
+	}
+}
+
+// TitleOptionFunc set title of chart
+func TitleOptionFunc(title TitleOption) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Title = title
+	}
+}
+
+// TitleTextOptionFunc set title text of chart
+func TitleTextOptionFunc(text string, subtext ...string) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Title.Text = text
+		if len(subtext) != 0 {
+			opt.Title.Subtext = subtext[0]
+		}
+	}
+}
+
+// LegendOptionFunc set legend of chart
+func LegendOptionFunc(legend LegendOption) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Legend = legend
+	}
+}
+
+// LegendLabelsOptionFunc set legend labels of chart
+func LegendLabelsOptionFunc(labels []string, left ...string) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Legend = NewLegendOption(labels, left...)
+	}
+}
+
+// XAxisOptionFunc set x axis of chart
+func XAxisOptionFunc(xAxisOption XAxisOption) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.XAxis = xAxisOption
+	}
+}
+
+// XAxisDataOptionFunc set x axis data of chart
+func XAxisDataOptionFunc(data []string, boundaryGap ...*bool) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.XAxis = NewXAxisOption(data, boundaryGap...)
+	}
+}
+
+// YAxisOptionFunc set y axis of chart, support two y axis
+func YAxisOptionFunc(yAxisOption ...YAxisOption) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.YAxisOptions = yAxisOption
+	}
+}
+
+// YAxisDataOptionFunc set y axis data of chart
+func YAxisDataOptionFunc(data []string) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.YAxisOptions = NewYAxisOptions(data)
+	}
+}
+
+// WidthOptionFunc set width of chart
+func WidthOptionFunc(width int) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Width = width
+	}
+}
+
+// HeightOptionFunc set height of chart
+func HeightOptionFunc(height int) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Height = height
+	}
+}
+
+// PaddingOptionFunc set padding of chart
+func PaddingOptionFunc(padding Box) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Padding = padding
+	}
+}
+
+// BoxOptionFunc set box of chart
+func BoxOptionFunc(box Box) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.Box = box
+	}
+}
+
+// PieSeriesShowLabel set pie series show label
+func PieSeriesShowLabel() OptionFunc {
+	return func(opt *ChartOption) {
+		for index := range opt.SeriesList {
+			opt.SeriesList[index].Label.Show = true
+		}
+	}
+}
+
+// ChildOptionFunc add child chart
+func ChildOptionFunc(child ...ChartOption) OptionFunc {
+	return func(opt *ChartOption) {
+		if opt.Children == nil {
+			opt.Children = make([]ChartOption, 0)
+		}
+		opt.Children = append(opt.Children, child...)
+	}
+}
+
+// RadarIndicatorOptionFunc set radar indicator of chart
+func RadarIndicatorOptionFunc(names []string, values []float64) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.RadarIndicators = NewRadarIndicators(names, values)
+	}
+}
+
+// BackgroundColorOptionFunc set background color of chart
+func BackgroundColorOptionFunc(color Color) OptionFunc {
+	return func(opt *ChartOption) {
+		opt.BackgroundColor = color
+	}
+}
+
+// MarkLineOptionFunc set mark line for series of chart
+func MarkLineOptionFunc(seriesIndex int, markLineTypes ...string) OptionFunc {
+	return func(opt *ChartOption) {
+		if len(opt.SeriesList) <= seriesIndex {
+			return
+		}
+		opt.SeriesList[seriesIndex].MarkLine = NewMarkLine(markLineTypes...)
+	}
+}
+
+// MarkPointOptionFunc set mark point for series of chart
+func MarkPointOptionFunc(seriesIndex int, markPointTypes ...string) OptionFunc {
+	return func(opt *ChartOption) {
+		if len(opt.SeriesList) <= seriesIndex {
+			return
+		}
+		opt.SeriesList[seriesIndex].MarkPoint = NewMarkPoint(markPointTypes...)
+	}
+}
+
+func (o *ChartOption) fillDefault() {
+	t := NewTheme(o.Theme)
+	o.theme = t
+	// 如果为空，初始化
+	axisCount := 1
+	for _, series := range o.SeriesList {
+		if series.AxisIndex >= axisCount {
+			axisCount++
+		}
+	}
+	o.Width = getDefaultInt(o.Width, defaultChartWidth)
+	o.Height = getDefaultInt(o.Height, defaultChartHeight)
+	yAxisOptions := make([]YAxisOption, axisCount)
+	copy(yAxisOptions, o.YAxisOptions)
+	o.YAxisOptions = yAxisOptions
+	o.font, _ = GetFont(o.FontFamily)
+
+	if o.font == nil {
+		o.font, _ = GetDefaultFont()
+	} else {
+		// 如果指定了字体，则设置主题的字体
+		t.SetFont(o.font)
+	}
+	if o.BackgroundColor.IsZero() {
+		o.BackgroundColor = t.GetBackgroundColor()
+	}
+	if o.Padding.IsZero() {
+		o.Padding = Box{
+			Top:    20,
+			Right:  20,
+			Bottom: 20,
+			Left:   20,
+		}
+	}
+	// legend与series name的关联
+	if len(o.Legend.Data) == 0 {
+		o.Legend.Data = o.SeriesList.Names()
+	} else {
+		seriesCount := len(o.SeriesList)
+		for index, name := range o.Legend.Data {
+			if index < seriesCount &&
+				len(o.SeriesList[index].Name) == 0 {
+				o.SeriesList[index].Name = name
+			}
+		}
+		nameIndexDict := map[string]int{}
+		for index, name := range o.Legend.Data {
+			nameIndexDict[name] = index
+		}
+		// 保证series的顺序与legend一致
+		sort.Slice(o.SeriesList, func(i, j int) bool {
+			return nameIndexDict[o.SeriesList[i].Name] < nameIndexDict[o.SeriesList[j].Name]
+		})
+	}
+}
+
+// LineRender line chart render
+func LineRender(values [][]float64, opts ...OptionFunc) (*Painter, error) {
+	seriesList := NewSeriesListDataFromValues(values, ChartTypeLine)
+	return Render(ChartOption{
+		SeriesList: seriesList,
+	}, opts...)
+}
+
+// BarRender bar chart render
+func BarRender(values [][]float64, opts ...OptionFunc) (*Painter, error) {
+	seriesList := NewSeriesListDataFromValues(values, ChartTypeBar)
+	return Render(ChartOption{
+		SeriesList: seriesList,
+	}, opts...)
+}
+
+// HorizontalBarRender horizontal bar chart render
+func HorizontalBarRender(values [][]float64, opts ...OptionFunc) (*Painter, error) {
+	seriesList := NewSeriesListDataFromValues(values, ChartTypeHorizontalBar)
+	return Render(ChartOption{
+		SeriesList: seriesList,
+	}, opts...)
+}
+
+// PieRender pie chart render
+func PieRender(values []float64, opts ...OptionFunc) (*Painter, error) {
+	return Render(ChartOption{
+		SeriesList: NewPieSeriesList(values),
+	}, opts...)
+}
+
+// RadarRender radar chart render
+func RadarRender(values [][]float64, opts ...OptionFunc) (*Painter, error) {
+	seriesList := NewSeriesListDataFromValues(values, ChartTypeRadar)
+	return Render(ChartOption{
+		SeriesList: seriesList,
+	}, opts...)
+}
+
+// FunnelRender funnel chart render
+func FunnelRender(values []float64, opts ...OptionFunc) (*Painter, error) {
+	seriesList := NewFunnelSeriesList(values)
+	return Render(ChartOption{
+		SeriesList: seriesList,
+	}, opts...)
+}
+
+// TableRender table chart render
+func TableRender(header []string, data [][]string, spanMaps ...map[int]int) (*Painter, error) {
+	opt := TableChartOption{
+		Header: header,
+		Data:   data,
+	}
+	if len(spanMaps) != 0 {
+		spanMap := spanMaps[0]
+		spans := make([]int, len(opt.Header))
+		for index := range spans {
+			v, ok := spanMap[index]
+			if !ok {
+				v = 1
+			}
+			spans[index] = v
+		}
+		opt.Spans = spans
+	}
+	return TableOptionRender(opt)
+}
+
+// TableOptionRender table render with option
+func TableOptionRender(opt TableChartOption) (*Painter, error) {
+	if opt.Type == "" {
+		opt.Type = ChartOutputPNG
+	}
+	if opt.Width <= 0 {
+		opt.Width = defaultChartWidth
+	}
+	if opt.FontFamily != "" {
+		opt.Font, _ = GetFont(opt.FontFamily)
+	}
+	if opt.Font == nil {
+		opt.Font, _ = GetDefaultFont()
+	}
+
+	p, err := NewPainter(PainterOptions{
+		Type:  opt.Type,
+		Width: opt.Width,
+		// 仅用于计算表格高度，因此随便设置即可
+		Height: 100,
+		Font:   opt.Font,
+	})
+	if err != nil {
+		return nil, err
+	}
+	info, err := NewTableChart(p, opt).render()
+	if err != nil {
+		return nil, err
+	}
+
+	p, err = NewPainter(PainterOptions{
+		Type:   opt.Type,
+		Width:  info.Width,
+		Height: info.Height,
+		Font:   opt.Font,
+	})
+	if err != nil {
+		return nil, err
+	}
+	_, err = NewTableChart(p, opt).renderWithInfo(info)
+	if err != nil {
+		return nil, err
+	}
+	return p, nil
+}

charts.go

@@ -0,0 +1,473 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"errors"
+	"math"
+	"sort"
+
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+const labelFontSize = 10
+const smallLabelFontSize = 8
+const defaultDotWidth = 2.0
+const defaultStrokeWidth = 2.0
+
+var defaultChartWidth = 600
+var defaultChartHeight = 400
+
+// SetDefaultWidth sets default width of chart
+func SetDefaultWidth(width int) {
+	if width > 0 {
+		defaultChartWidth = width
+	}
+}
+
+// SetDefaultHeight sets default height of chart
+func SetDefaultHeight(height int) {
+	if height > 0 {
+		defaultChartHeight = height
+	}
+}
+
+var nullValue = math.MaxFloat64
+
+// SetNullValue sets the null value, default is MaxFloat64
+func SetNullValue(v float64) {
+	nullValue = v
+}
+
+// GetNullValue gets the null value
+func GetNullValue() float64 {
+	return nullValue
+}
+
+type Renderer interface {
+	Render() (Box, error)
+}
+
+type renderHandler struct {
+	list []func() error
+}
+
+func (rh *renderHandler) Add(fn func() error) {
+	list := rh.list
+	if len(list) == 0 {
+		list = make([]func() error, 0)
+	}
+	rh.list = append(list, fn)
+}
+
+func (rh *renderHandler) Do() error {
+	for _, fn := range rh.list {
+		err := fn()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+type defaultRenderOption struct {
+	Theme      ColorPalette
+	Padding    Box
+	SeriesList SeriesList
+	// The y axis option
+	YAxisOptions []YAxisOption
+	// The x axis option
+	XAxis XAxisOption
+	// The title option
+	TitleOption TitleOption
+	// The legend option
+	LegendOption LegendOption
+	// background is filled
+	backgroundIsFilled bool
+	// x y axis is reversed
+	axisReversed bool
+}
+
+type defaultRenderResult struct {
+	axisRanges map[int]axisRange
+	// 图例区域
+	seriesPainter *Painter
+}
+
+func defaultRender(p *Painter, opt defaultRenderOption) (*defaultRenderResult, error) {
+	seriesList := opt.SeriesList
+	seriesList.init()
+	if !opt.backgroundIsFilled {
+		p.SetBackground(p.Width(), p.Height(), opt.Theme.GetBackgroundColor())
+	}
+
+	if !opt.Padding.IsZero() {
+		p = p.Child(PainterPaddingOption(opt.Padding))
+	}
+
+	legendHeight := 0
+	if len(opt.LegendOption.Data) != 0 {
+		if opt.LegendOption.Theme == nil {
+			opt.LegendOption.Theme = opt.Theme
+		}
+		legendResult, err := NewLegendPainter(p, opt.LegendOption).Render()
+		if err != nil {
+			return nil, err
+		}
+		legendHeight = legendResult.Height()
+	}
+
+	// 如果有标题
+	if opt.TitleOption.Text != "" {
+		if opt.TitleOption.Theme == nil {
+			opt.TitleOption.Theme = opt.Theme
+		}
+		titlePainter := NewTitlePainter(p, opt.TitleOption)
+
+		titleBox, err := titlePainter.Render()
+		if err != nil {
+			return nil, err
+		}
+
+		top := chart.MaxInt(legendHeight, titleBox.Height())
+		// 如果是垂直方式，则不计算legend高度
+		if opt.LegendOption.Orient == OrientVertical {
+			top = titleBox.Height()
+		}
+		p = p.Child(PainterPaddingOption(Box{
+			// 标题下留白
+			Top: top + 20,
+		}))
+	}
+
+	result := defaultRenderResult{
+		axisRanges: make(map[int]axisRange),
+	}
+
+	// 计算图表对应的轴有哪些
+	axisIndexList := make([]int, 0)
+	for _, series := range opt.SeriesList {
+		if containsInt(axisIndexList, series.AxisIndex) {
+			continue
+		}
+		axisIndexList = append(axisIndexList, series.AxisIndex)
+	}
+	// 高度需要减去x轴的高度
+	rangeHeight := p.Height() - defaultXAxisHeight
+	rangeWidthLeft := 0
+	rangeWidthRight := 0
+
+	// 倒序
+	sort.Sort(sort.Reverse(sort.IntSlice(axisIndexList)))
+
+	// 计算对应的axis range
+	for _, index := range axisIndexList {
+		yAxisOption := YAxisOption{}
+		if len(opt.YAxisOptions) > index {
+			yAxisOption = opt.YAxisOptions[index]
+		}
+		divideCount := yAxisOption.DivideCount
+		if divideCount <= 0 {
+			divideCount = defaultAxisDivideCount
+		}
+		max, min := opt.SeriesList.GetMaxMin(index)
+		r := NewRange(AxisRangeOption{
+			Painter: p,
+			Min:     min,
+			Max:     max,
+			// 高度需要减去x轴的高度
+			Size: rangeHeight,
+			// 分隔数量
+			DivideCount: divideCount,
+		})
+		if yAxisOption.Min != nil && *yAxisOption.Min <= min {
+			r.min = *yAxisOption.Min
+		}
+		if yAxisOption.Max != nil && *yAxisOption.Max >= max {
+			r.max = *yAxisOption.Max
+		}
+		result.axisRanges[index] = r
+
+		if yAxisOption.Theme == nil {
+			yAxisOption.Theme = opt.Theme
+		}
+		if !opt.axisReversed {
+			yAxisOption.Data = r.Values()
+		} else {
+			yAxisOption.isCategoryAxis = true
+			// 由于x轴为value部分，因此计算其label单独处理
+			opt.XAxis.Data = NewRange(AxisRangeOption{
+				Painter: p,
+				Min:     min,
+				Max:     max,
+				// 高度需要减去x轴的高度
+				Size: rangeHeight,
+				// 分隔数量
+				DivideCount: defaultAxisDivideCount,
+			}).Values()
+			opt.XAxis.isValueAxis = true
+		}
+		reverseStringSlice(yAxisOption.Data)
+		// TODO生成其它位置既yAxis
+		var yAxis *axisPainter
+		child := p.Child(PainterPaddingOption(Box{
+			Left:  rangeWidthLeft,
+			Right: rangeWidthRight,
+		}))
+		if index == 0 {
+			yAxis = NewLeftYAxis(child, yAxisOption)
+		} else {
+			yAxis = NewRightYAxis(child, yAxisOption)
+		}
+		yAxisBox, err := yAxis.Render()
+		if err != nil {
+			return nil, err
+		}
+		if index == 0 {
+			rangeWidthLeft += yAxisBox.Width()
+		} else {
+			rangeWidthRight += yAxisBox.Width()
+		}
+	}
+
+	if opt.XAxis.Theme == nil {
+		opt.XAxis.Theme = opt.Theme
+	}
+	xAxis := NewBottomXAxis(p.Child(PainterPaddingOption(Box{
+		Left:  rangeWidthLeft,
+		Right: rangeWidthRight,
+	})), opt.XAxis)
+	_, err := xAxis.Render()
+	if err != nil {
+		return nil, err
+	}
+
+	result.seriesPainter = p.Child(PainterPaddingOption(Box{
+		Bottom: defaultXAxisHeight,
+		Left:   rangeWidthLeft,
+		Right:  rangeWidthRight,
+	}))
+	return &result, nil
+}
+
+func doRender(renderers ...Renderer) error {
+	for _, r := range renderers {
+		_, err := r.Render()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func Render(opt ChartOption, opts ...OptionFunc) (*Painter, error) {
+	for _, fn := range opts {
+		fn(&opt)
+	}
+	opt.fillDefault()
+
+	isChild := true
+	if opt.Parent == nil {
+		isChild = false
+		p, err := NewPainter(PainterOptions{
+			Type:   opt.Type,
+			Width:  opt.Width,
+			Height: opt.Height,
+			Font:   opt.font,
+		})
+		if err != nil {
+			return nil, err
+		}
+		opt.Parent = p
+	}
+	p := opt.Parent
+	if opt.ValueFormatter != nil {
+		p.valueFormatter = opt.ValueFormatter
+	}
+	if !opt.Box.IsZero() {
+		p = p.Child(PainterBoxOption(opt.Box))
+	}
+	if !isChild {
+		p.SetBackground(p.Width(), p.Height(), opt.BackgroundColor)
+	}
+	seriesList := opt.SeriesList
+	seriesList.init()
+
+	seriesCount := len(seriesList)
+
+	// line chart
+	lineSeriesList := seriesList.Filter(ChartTypeLine)
+	barSeriesList := seriesList.Filter(ChartTypeBar)
+	horizontalBarSeriesList := seriesList.Filter(ChartTypeHorizontalBar)
+	pieSeriesList := seriesList.Filter(ChartTypePie)
+	radarSeriesList := seriesList.Filter(ChartTypeRadar)
+	funnelSeriesList := seriesList.Filter(ChartTypeFunnel)
+
+	if len(horizontalBarSeriesList) != 0 && len(horizontalBarSeriesList) != seriesCount {
+		return nil, errors.New("Horizontal bar can not mix other charts")
+	}
+	if len(pieSeriesList) != 0 && len(pieSeriesList) != seriesCount {
+		return nil, errors.New("Pie can not mix other charts")
+	}
+	if len(radarSeriesList) != 0 && len(radarSeriesList) != seriesCount {
+		return nil, errors.New("Radar can not mix other charts")
+	}
+	if len(funnelSeriesList) != 0 && len(funnelSeriesList) != seriesCount {
+		return nil, errors.New("Funnel can not mix other charts")
+	}
+
+	axisReversed := len(horizontalBarSeriesList) != 0
+	renderOpt := defaultRenderOption{
+		Theme:        opt.theme,
+		Padding:      opt.Padding,
+		SeriesList:   opt.SeriesList,
+		XAxis:        opt.XAxis,
+		YAxisOptions: opt.YAxisOptions,
+		TitleOption:  opt.Title,
+		LegendOption: opt.Legend,
+		axisReversed: axisReversed,
+		// 前置已设置背景色
+		backgroundIsFilled: true,
+	}
+	if len(pieSeriesList) != 0 ||
+		len(radarSeriesList) != 0 ||
+		len(funnelSeriesList) != 0 {
+		renderOpt.XAxis.Show = FalseFlag()
+		renderOpt.YAxisOptions = []YAxisOption{
+			{
+				Show: FalseFlag(),
+			},
+		}
+	}
+	if len(horizontalBarSeriesList) != 0 {
+		renderOpt.YAxisOptions[0].DivideCount = len(renderOpt.YAxisOptions[0].Data)
+		renderOpt.YAxisOptions[0].Unit = 1
+	}
+
+	renderResult, err := defaultRender(p, renderOpt)
+	if err != nil {
+		return nil, err
+	}
+
+	handler := renderHandler{}
+
+	// bar chart
+	if len(barSeriesList) != 0 {
+		handler.Add(func() error {
+			_, err := NewBarChart(p, BarChartOption{
+				Theme:     opt.theme,
+				Font:      opt.font,
+				XAxis:     opt.XAxis,
+				BarWidth:  opt.BarWidth,
+				BarMargin: opt.BarMargin,
+			}).render(renderResult, barSeriesList)
+			return err
+		})
+	}
+
+	// horizontal bar chart
+	if len(horizontalBarSeriesList) != 0 {
+		handler.Add(func() error {
+			_, err := NewHorizontalBarChart(p, HorizontalBarChartOption{
+				Theme:        opt.theme,
+				Font:         opt.font,
+				BarHeight:    opt.BarHeight,
+				BarMargin:    opt.BarMargin,
+				YAxisOptions: opt.YAxisOptions,
+			}).render(renderResult, horizontalBarSeriesList)
+			return err
+		})
+	}
+
+	// pie chart
+	if len(pieSeriesList) != 0 {
+		handler.Add(func() error {
+			_, err := NewPieChart(p, PieChartOption{
+				Theme: opt.theme,
+				Font:  opt.font,
+			}).render(renderResult, pieSeriesList)
+			return err
+		})
+	}
+
+	// line chart
+	if len(lineSeriesList) != 0 {
+		handler.Add(func() error {
+			_, err := NewLineChart(p, LineChartOption{
+				Theme:       opt.theme,
+				Font:        opt.font,
+				XAxis:       opt.XAxis,
+				SymbolShow:  opt.SymbolShow,
+				StrokeWidth: opt.LineStrokeWidth,
+				FillArea:    opt.FillArea,
+				Opacity:     opt.Opacity,
+			}).render(renderResult, lineSeriesList)
+			return err
+		})
+	}
+
+	// radar chart
+	if len(radarSeriesList) != 0 {
+		handler.Add(func() error {
+			_, err := NewRadarChart(p, RadarChartOption{
+				Theme: opt.theme,
+				Font:  opt.font,
+				// 相应值
+				RadarIndicators: opt.RadarIndicators,
+			}).render(renderResult, radarSeriesList)
+			return err
+		})
+	}
+
+	// funnel chart
+	if len(funnelSeriesList) != 0 {
+		handler.Add(func() error {
+			_, err := NewFunnelChart(p, FunnelChartOption{
+				Theme: opt.theme,
+				Font:  opt.font,
+			}).render(renderResult, funnelSeriesList)
+			return err
+		})
+	}
+
+	err = handler.Do()
+
+	if err != nil {
+		return nil, err
+	}
+	for _, item := range opt.Children {
+		item.Parent = p
+		if item.Theme == "" {
+			item.Theme = opt.Theme
+		}
+		if item.FontFamily == "" {
+			item.FontFamily = opt.FontFamily
+		}
+		_, err = Render(item)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return p, nil
+}

charts_test.go

@@ -0,0 +1,255 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"errors"
+	"testing"
+
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+func BenchmarkMultiChartPNGRender(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		opt := ChartOption{
+			Type: ChartOutputPNG,
+			Legend: LegendOption{
+				Top: "-90",
+				Data: []string{
+					"Milk Tea",
+					"Matcha Latte",
+					"Cheese Cocoa",
+					"Walnut Brownie",
+				},
+			},
+			Padding: chart.Box{
+				Top:    100,
+				Right:  10,
+				Bottom: 10,
+				Left:   10,
+			},
+			XAxis: NewXAxisOption([]string{
+				"2012",
+				"2013",
+				"2014",
+				"2015",
+				"2016",
+				"2017",
+			}),
+			YAxisOptions: []YAxisOption{
+				{
+
+					Min: NewFloatPoint(0),
+					Max: NewFloatPoint(90),
+				},
+			},
+			SeriesList: []Series{
+				NewSeriesFromValues([]float64{
+					56.5,
+					82.1,
+					88.7,
+					70.1,
+					53.4,
+					85.1,
+				}),
+				NewSeriesFromValues([]float64{
+					51.1,
+					51.4,
+					55.1,
+					53.3,
+					73.8,
+					68.7,
+				}),
+				NewSeriesFromValues([]float64{
+					40.1,
+					62.2,
+					69.5,
+					36.4,
+					45.2,
+					32.5,
+				}, ChartTypeBar),
+				NewSeriesFromValues([]float64{
+					25.2,
+					37.1,
+					41.2,
+					18,
+					33.9,
+					49.1,
+				}, ChartTypeBar),
+			},
+			Children: []ChartOption{
+				{
+					Legend: LegendOption{
+						Show: FalseFlag(),
+						Data: []string{
+							"Milk Tea",
+							"Matcha Latte",
+							"Cheese Cocoa",
+							"Walnut Brownie",
+						},
+					},
+					Box: chart.Box{
+						Top:    20,
+						Left:   400,
+						Right:  500,
+						Bottom: 120,
+					},
+					SeriesList: NewPieSeriesList([]float64{
+						435.9,
+						354.3,
+						285.9,
+						204.5,
+					}, PieSeriesOption{
+						Label: SeriesLabel{
+							Show: true,
+						},
+						Radius: "35%",
+					}),
+				},
+			},
+		}
+		d, err := Render(opt)
+		if err != nil {
+			panic(err)
+		}
+		buf, err := d.Bytes()
+		if err != nil {
+			panic(err)
+		}
+		if len(buf) == 0 {
+			panic(errors.New("data is nil"))
+		}
+	}
+}
+
+func BenchmarkMultiChartSVGRender(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		opt := ChartOption{
+			Legend: LegendOption{
+				Top: "-90",
+				Data: []string{
+					"Milk Tea",
+					"Matcha Latte",
+					"Cheese Cocoa",
+					"Walnut Brownie",
+				},
+			},
+			Padding: chart.Box{
+				Top:    100,
+				Right:  10,
+				Bottom: 10,
+				Left:   10,
+			},
+			XAxis: NewXAxisOption([]string{
+				"2012",
+				"2013",
+				"2014",
+				"2015",
+				"2016",
+				"2017",
+			}),
+			YAxisOptions: []YAxisOption{
+				{
+
+					Min: NewFloatPoint(0),
+					Max: NewFloatPoint(90),
+				},
+			},
+			SeriesList: []Series{
+				NewSeriesFromValues([]float64{
+					56.5,
+					82.1,
+					88.7,
+					70.1,
+					53.4,
+					85.1,
+				}),
+				NewSeriesFromValues([]float64{
+					51.1,
+					51.4,
+					55.1,
+					53.3,
+					73.8,
+					68.7,
+				}),
+				NewSeriesFromValues([]float64{
+					40.1,
+					62.2,
+					69.5,
+					36.4,
+					45.2,
+					32.5,
+				}, ChartTypeBar),
+				NewSeriesFromValues([]float64{
+					25.2,
+					37.1,
+					41.2,
+					18,
+					33.9,
+					49.1,
+				}, ChartTypeBar),
+			},
+			Children: []ChartOption{
+				{
+					Legend: LegendOption{
+						Show: FalseFlag(),
+						Data: []string{
+							"Milk Tea",
+							"Matcha Latte",
+							"Cheese Cocoa",
+							"Walnut Brownie",
+						},
+					},
+					Box: chart.Box{
+						Top:    20,
+						Left:   400,
+						Right:  500,
+						Bottom: 120,
+					},
+					SeriesList: NewPieSeriesList([]float64{
+						435.9,
+						354.3,
+						285.9,
+						204.5,
+					}, PieSeriesOption{
+						Label: SeriesLabel{
+							Show: true,
+						},
+						Radius: "35%",
+					}),
+				},
+			},
+		}
+		d, err := Render(opt)
+		if err != nil {
+			panic(err)
+		}
+		buf, err := d.Bytes()
+		if err != nil {
+			panic(err)
+		}
+		if len(buf) == 0 {
+			panic(errors.New("data is nil"))
+		}
+	}
+}

echarts.go

@@ -0,0 +1,528 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"strconv"
+
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+func convertToArray(data []byte) []byte {
+	data = bytes.TrimSpace(data)
+	if len(data) == 0 {
+		return nil
+	}
+	if data[0] != '[' {
+		data = []byte("[" + string(data) + "]")
+	}
+	return data
+}
+
+type EChartsPosition string
+
+func (p *EChartsPosition) UnmarshalJSON(data []byte) error {
+	if len(data) == 0 {
+		return nil
+	}
+	if regexp.MustCompile(`^\d+`).Match(data) {
+		data = []byte(fmt.Sprintf(`"%s"`, string(data)))
+	}
+	s := (*string)(p)
+	return json.Unmarshal(data, s)
+}
+
+type EChartStyle struct {
+	Color string `json:"color"`
+}
+
+func (es *EChartStyle) ToStyle() Style {
+	color := parseColor(es.Color)
+	return Style{
+		FillColor:   color,
+		FontColor:   color,
+		StrokeColor: color,
+	}
+}
+
+type EChartsSeriesDataValue struct {
+	values []float64
+}
+
+func (value *EChartsSeriesDataValue) UnmarshalJSON(data []byte) error {
+	data = convertToArray(data)
+	return json.Unmarshal(data, &value.values)
+}
+func (value *EChartsSeriesDataValue) First() float64 {
+	if len(value.values) == 0 {
+		return 0
+	}
+	return value.values[0]
+}
+func NewEChartsSeriesDataValue(values ...float64) EChartsSeriesDataValue {
+	return EChartsSeriesDataValue{
+		values: values,
+	}
+}
+
+type EChartsSeriesData struct {
+	Value     EChartsSeriesDataValue `json:"value"`
+	Name      string                 `json:"name"`
+	ItemStyle EChartStyle            `json:"itemStyle"`
+}
+type _EChartsSeriesData EChartsSeriesData
+
+var numericRep = regexp.MustCompile(`^[-+]?[0-9]+(?:\.[0-9]+)?$`)
+
+func (es *EChartsSeriesData) UnmarshalJSON(data []byte) error {
+	data = bytes.TrimSpace(data)
+	if len(data) == 0 {
+		return nil
+	}
+	if numericRep.Match(data) {
+		v, err := strconv.ParseFloat(string(data), 64)
+		if err != nil {
+			return err
+		}
+		es.Value = EChartsSeriesDataValue{
+			values: []float64{
+				v,
+			},
+		}
+		return nil
+	}
+	v := _EChartsSeriesData{}
+	err := json.Unmarshal(data, &v)
+	if err != nil {
+		return err
+	}
+	es.Name = v.Name
+	es.Value = v.Value
+	es.ItemStyle = v.ItemStyle
+	return nil
+}
+
+type EChartsXAxisData struct {
+	BoundaryGap *bool    `json:"boundaryGap"`
+	SplitNumber int      `json:"splitNumber"`
+	Data        []string `json:"data"`
+	Type        string   `json:"type"`
+}
+type EChartsXAxis struct {
+	Data []EChartsXAxisData
+}
+
+func (ex *EChartsXAxis) UnmarshalJSON(data []byte) error {
+	data = convertToArray(data)
+	if len(data) == 0 {
+		return nil
+	}
+	return json.Unmarshal(data, &ex.Data)
+}
+
+type EChartsAxisLabel struct {
+	Formatter string `json:"formatter"`
+}
+type EChartsYAxisData struct {
+	Min       *float64         `json:"min"`
+	Max       *float64         `json:"max"`
+	AxisLabel EChartsAxisLabel `json:"axisLabel"`
+	AxisLine  struct {
+		LineStyle struct {
+			Color string `json:"color"`
+		} `json:"lineStyle"`
+	} `json:"axisLine"`
+	Data []string `json:"data"`
+}
+type EChartsYAxis struct {
+	Data []EChartsYAxisData `json:"data"`
+}
+
+func (ey *EChartsYAxis) UnmarshalJSON(data []byte) error {
+	data = convertToArray(data)
+	if len(data) == 0 {
+		return nil
+	}
+	return json.Unmarshal(data, &ey.Data)
+}
+
+type EChartsPadding struct {
+	Box chart.Box
+}
+
+func (eb *EChartsPadding) UnmarshalJSON(data []byte) error {
+	data = convertToArray(data)
+	if len(data) == 0 {
+		return nil
+	}
+	arr := make([]int, 0)
+	err := json.Unmarshal(data, &arr)
+	if err != nil {
+		return err
+	}
+	if len(arr) == 0 {
+		return nil
+	}
+	switch len(arr) {
+	case 1:
+		eb.Box = chart.Box{
+			Left:   arr[0],
+			Top:    arr[0],
+			Bottom: arr[0],
+			Right:  arr[0],
+		}
+	case 2:
+		eb.Box = chart.Box{
+			Top:    arr[0],
+			Bottom: arr[0],
+			Left:   arr[1],
+			Right:  arr[1],
+		}
+	default:
+		result := make([]int, 4)
+		copy(result, arr)
+		if len(arr) == 3 {
+			result[3] = result[1]
+		}
+		// 上右下左
+		eb.Box = chart.Box{
+			Top:    result[0],
+			Right:  result[1],
+			Bottom: result[2],
+			Left:   result[3],
+		}
+	}
+	return nil
+}
+
+type EChartsLabelOption struct {
+	Show     bool   `json:"show"`
+	Distance int    `json:"distance"`
+	Color    string `json:"color"`
+}
+type EChartsLegend struct {
+	Show      *bool            `json:"show"`
+	Data      []string         `json:"data"`
+	Align     string           `json:"align"`
+	Orient    string           `json:"orient"`
+	Padding   EChartsPadding   `json:"padding"`
+	Left      EChartsPosition  `json:"left"`
+	Top       EChartsPosition  `json:"top"`
+	TextStyle EChartsTextStyle `json:"textStyle"`
+}
+
+type EChartsMarkData struct {
+	Type string `json:"type"`
+}
+type _EChartsMarkData EChartsMarkData
+
+func (emd *EChartsMarkData) UnmarshalJSON(data []byte) error {
+	data = bytes.TrimSpace(data)
+	if len(data) == 0 {
+		return nil
+	}
+	data = convertToArray(data)
+	ds := make([]*_EChartsMarkData, 0)
+	err := json.Unmarshal(data, &ds)
+	if err != nil {
+		return err
+	}
+	for _, d := range ds {
+		if d.Type != "" {
+			emd.Type = d.Type
+		}
+	}
+	return nil
+}
+
+type EChartsMarkPoint struct {
+	SymbolSize int               `json:"symbolSize"`
+	Data       []EChartsMarkData `json:"data"`
+}
+
+func (emp *EChartsMarkPoint) ToSeriesMarkPoint() SeriesMarkPoint {
+	sp := SeriesMarkPoint{
+		SymbolSize: emp.SymbolSize,
+	}
+	if len(emp.Data) == 0 {
+		return sp
+	}
+	data := make([]SeriesMarkData, len(emp.Data))
+	for index, item := range emp.Data {
+		data[index].Type = item.Type
+	}
+	sp.Data = data
+	return sp
+}
+
+type EChartsMarkLine struct {
+	Data []EChartsMarkData `json:"data"`
+}
+
+func (eml *EChartsMarkLine) ToSeriesMarkLine() SeriesMarkLine {
+	sl := SeriesMarkLine{}
+	if len(eml.Data) == 0 {
+		return sl
+	}
+	data := make([]SeriesMarkData, len(eml.Data))
+	for index, item := range eml.Data {
+		data[index].Type = item.Type
+	}
+	sl.Data = data
+	return sl
+}
+
+type EChartsSeries struct {
+	Data       []EChartsSeriesData `json:"data"`
+	Name       string              `json:"name"`
+	Type       string              `json:"type"`
+	Radius     string              `json:"radius"`
+	YAxisIndex int                 `json:"yAxisIndex"`
+	ItemStyle  EChartStyle         `json:"itemStyle"`
+	// label的配置
+	Label     EChartsLabelOption `json:"label"`
+	MarkPoint EChartsMarkPoint   `json:"markPoint"`
+	MarkLine  EChartsMarkLine    `json:"markLine"`
+	Max       *float64           `json:"max"`
+	Min       *float64           `json:"min"`
+}
+type EChartsSeriesList []EChartsSeries
+
+func (esList EChartsSeriesList) ToSeriesList() SeriesList {
+	seriesList := make(SeriesList, 0, len(esList))
+	for _, item := range esList {
+		// 如果是pie，则每个子荐生成一个series
+		if item.Type == ChartTypePie {
+			for _, dataItem := range item.Data {
+				seriesList = append(seriesList, Series{
+					Type: item.Type,
+					Name: dataItem.Name,
+					Label: SeriesLabel{
+						Show: true,
+					},
+					Radius: item.Radius,
+					Data: []SeriesData{
+						{
+							Value: dataItem.Value.First(),
+						},
+					},
+				})
+			}
+			continue
+		}
+		// 如果是radar或funnel
+		if item.Type == ChartTypeRadar ||
+			item.Type == ChartTypeFunnel {
+			for _, dataItem := range item.Data {
+				seriesList = append(seriesList, Series{
+					Name: dataItem.Name,
+					Type: item.Type,
+					Data: NewSeriesDataFromValues(dataItem.Value.values),
+					Max:  item.Max,
+					Min:  item.Min,
+					Label: SeriesLabel{
+						Color:    parseColor(item.Label.Color),
+						Show:     item.Label.Show,
+						Distance: item.Label.Distance,
+					},
+				})
+			}
+			continue
+		}
+		data := make([]SeriesData, len(item.Data))
+		for j, dataItem := range item.Data {
+			data[j] = SeriesData{
+				Value: dataItem.Value.First(),
+				Style: dataItem.ItemStyle.ToStyle(),
+			}
+		}
+		seriesList = append(seriesList, Series{
+			Type:      item.Type,
+			Data:      data,
+			AxisIndex: item.YAxisIndex,
+			Style:     item.ItemStyle.ToStyle(),
+			Label: SeriesLabel{
+				Color:    parseColor(item.Label.Color),
+				Show:     item.Label.Show,
+				Distance: item.Label.Distance,
+			},
+			Name:      item.Name,
+			MarkPoint: item.MarkPoint.ToSeriesMarkPoint(),
+			MarkLine:  item.MarkLine.ToSeriesMarkLine(),
+		})
+	}
+	return seriesList
+}
+
+type EChartsTextStyle struct {
+	Color      string  `json:"color"`
+	FontFamily string  `json:"fontFamily"`
+	FontSize   float64 `json:"fontSize"`
+}
+
+func (et *EChartsTextStyle) ToStyle() chart.Style {
+	s := chart.Style{
+		FontSize:  et.FontSize,
+		FontColor: parseColor(et.Color),
+	}
+	if et.FontFamily != "" {
+		s.Font, _ = GetFont(et.FontFamily)
+	}
+	return s
+}
+
+type EChartsOption struct {
+	Type       string         `json:"type"`
+	Theme      string         `json:"theme"`
+	FontFamily string         `json:"fontFamily"`
+	Padding    EChartsPadding `json:"padding"`
+	Box        chart.Box      `json:"box"`
+	Width      int            `json:"width"`
+	Height     int            `json:"height"`
+	Title      struct {
+		Text         string           `json:"text"`
+		Subtext      string           `json:"subtext"`
+		Left         EChartsPosition  `json:"left"`
+		Top          EChartsPosition  `json:"top"`
+		TextStyle    EChartsTextStyle `json:"textStyle"`
+		SubtextStyle EChartsTextStyle `json:"subtextStyle"`
+	} `json:"title"`
+	XAxis  EChartsXAxis  `json:"xAxis"`
+	YAxis  EChartsYAxis  `json:"yAxis"`
+	Legend EChartsLegend `json:"legend"`
+	Radar  struct {
+		Indicator []RadarIndicator `json:"indicator"`
+	} `json:"radar"`
+	Series   EChartsSeriesList `json:"series"`
+	Children []EChartsOption   `json:"children"`
+}
+
+func (eo *EChartsOption) ToOption() ChartOption {
+	fontFamily := eo.FontFamily
+	if len(fontFamily) == 0 {
+		fontFamily = eo.Title.TextStyle.FontFamily
+	}
+	titleTextStyle := eo.Title.TextStyle.ToStyle()
+	titleSubtextStyle := eo.Title.SubtextStyle.ToStyle()
+	legendTextStyle := eo.Legend.TextStyle.ToStyle()
+	o := ChartOption{
+		Type:       eo.Type,
+		FontFamily: fontFamily,
+		Theme:      eo.Theme,
+		Title: TitleOption{
+			Text:             eo.Title.Text,
+			Subtext:          eo.Title.Subtext,
+			FontColor:        titleTextStyle.FontColor,
+			FontSize:         titleTextStyle.FontSize,
+			SubtextFontSize:  titleSubtextStyle.FontSize,
+			SubtextFontColor: titleSubtextStyle.FontColor,
+			Left:             string(eo.Title.Left),
+			Top:              string(eo.Title.Top),
+		},
+		Legend: LegendOption{
+			Show:      eo.Legend.Show,
+			FontSize:  legendTextStyle.FontSize,
+			FontColor: legendTextStyle.FontColor,
+			Data:      eo.Legend.Data,
+			Left:      string(eo.Legend.Left),
+			Top:       string(eo.Legend.Top),
+			Align:     eo.Legend.Align,
+			Orient:    eo.Legend.Orient,
+		},
+		RadarIndicators: eo.Radar.Indicator,
+		Width:           eo.Width,
+		Height:          eo.Height,
+		Padding:         eo.Padding.Box,
+		Box:             eo.Box,
+		SeriesList:      eo.Series.ToSeriesList(),
+	}
+	isHorizontalChart := false
+	for _, item := range eo.XAxis.Data {
+		if item.Type == "value" {
+			isHorizontalChart = true
+		}
+	}
+	if isHorizontalChart {
+		for index := range o.SeriesList {
+			series := o.SeriesList[index]
+			if series.Type == ChartTypeBar {
+				o.SeriesList[index].Type = ChartTypeHorizontalBar
+			}
+		}
+	}
+
+	if len(eo.XAxis.Data) != 0 {
+		xAxisData := eo.XAxis.Data[0]
+		o.XAxis = XAxisOption{
+			BoundaryGap: xAxisData.BoundaryGap,
+			Data:        xAxisData.Data,
+			SplitNumber: xAxisData.SplitNumber,
+		}
+	}
+	yAxisOptions := make([]YAxisOption, len(eo.YAxis.Data))
+	for index, item := range eo.YAxis.Data {
+		yAxisOptions[index] = YAxisOption{
+			Min:       item.Min,
+			Max:       item.Max,
+			Formatter: item.AxisLabel.Formatter,
+			Color:     parseColor(item.AxisLine.LineStyle.Color),
+			Data:      item.Data,
+		}
+	}
+	o.YAxisOptions = yAxisOptions
+
+	if len(eo.Children) != 0 {
+		o.Children = make([]ChartOption, len(eo.Children))
+		for index, item := range eo.Children {
+			o.Children[index] = item.ToOption()
+		}
+	}
+	return o
+}
+
+func renderEcharts(options, outputType string) ([]byte, error) {
+	o := EChartsOption{}
+	err := json.Unmarshal([]byte(options), &o)
+	if err != nil {
+		return nil, err
+	}
+	opt := o.ToOption()
+	opt.Type = outputType
+	d, err := Render(opt)
+	if err != nil {
+		return nil, err
+	}
+	return d.Bytes()
+}
+
+func RenderEChartsToPNG(options string) ([]byte, error) {
+	return renderEcharts(options, "png")
+}
+
+func RenderEChartsToSVG(options string) ([]byte, error) {
+	return renderEcharts(options, "svg")
+}

entrypoint.sh

@@ -1,8 +0,0 @@
-#!/bin/sh
-set -e
-
-if [ "${1:0:1}" = '-' ]; then
-    set -- go-charts "$@"
-fi
-
-exec "$@"

examples/area_line_chart/main.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "area-line-chart.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	values := [][]float64{
+		{
+			120,
+			132,
+			101,
+			134,
+			90,
+			230,
+			210,
+		},
+	}
+	p, err := charts.LineRender(
+		values,
+		charts.TitleTextOptionFunc("Line"),
+		charts.XAxisDataOptionFunc([]string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"Email",
+		}, "50"),
+		func(opt *charts.ChartOption) {
+			opt.Legend.Padding = charts.Box{
+				Top:    5,
+				Bottom: 10,
+			}
+			opt.FillArea = true
+		},
+	)
+
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

examples/bar_chart/main.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "bar-chart.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	values := [][]float64{
+		{
+			2.0,
+			4.9,
+			7.0,
+			23.2,
+			25.6,
+			76.7,
+			135.6,
+			162.2,
+			32.6,
+			20.0,
+			6.4,
+			3.3,
+		},
+		{
+			2.6,
+			5.9,
+			9.0,
+			26.4,
+			28.7,
+			70.7,
+			175.6,
+			182.2,
+			48.7,
+			18.8,
+			6.0,
+			2.3,
+		},
+	}
+	p, err := charts.BarRender(
+		values,
+		charts.XAxisDataOptionFunc([]string{
+			"Jan",
+			"Feb",
+			"Mar",
+			"Apr",
+			"May",
+			"Jun",
+			"Jul",
+			"Aug",
+			"Sep",
+			"Oct",
+			"Nov",
+			"Dec",
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"Rainfall",
+			"Evaporation",
+		}, charts.PositionRight),
+		charts.MarkLineOptionFunc(0, charts.SeriesMarkDataTypeAverage),
+		charts.MarkPointOptionFunc(0, charts.SeriesMarkDataTypeMax,
+			charts.SeriesMarkDataTypeMin),
+		// custom option func
+		func(opt *charts.ChartOption) {
+			opt.SeriesList[1].MarkPoint = charts.NewMarkPoint(
+				charts.SeriesMarkDataTypeMax,
+				charts.SeriesMarkDataTypeMin,
+			)
+			opt.SeriesList[1].MarkLine = charts.NewMarkLine(
+				charts.SeriesMarkDataTypeAverage,
+			)
+		},
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

examples/chinese/main.go

@@ -0,0 +1,120 @@
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "chinese-line-chart.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	// 字体文件需要自行下载
+	// https://github.com/googlefonts/noto-cjk
+	buf, err := ioutil.ReadFile("./NotoSansSC.ttf")
+	if err != nil {
+		panic(err)
+	}
+	err = charts.InstallFont("noto", buf)
+	if err != nil {
+		panic(err)
+	}
+	font, _ := charts.GetFont("noto")
+	charts.SetDefaultFont(font)
+
+	values := [][]float64{
+		{
+			120,
+			132,
+			101,
+			134,
+			90,
+			230,
+			210,
+		},
+		{
+			220,
+			182,
+			191,
+			234,
+			290,
+			330,
+			310,
+		},
+		{
+			150,
+			232,
+			201,
+			154,
+			190,
+			330,
+			410,
+		},
+		{
+			320,
+			332,
+			301,
+			334,
+			390,
+			330,
+			320,
+		},
+		{
+			820,
+			932,
+			901,
+			934,
+			1290,
+			1330,
+			1320,
+		},
+	}
+	p, err := charts.LineRender(
+		values,
+		charts.TitleTextOptionFunc("测试"),
+		charts.XAxisDataOptionFunc([]string{
+			"星期一",
+			"星期二",
+			"星期三",
+			"星期四",
+			"星期五",
+			"星期六",
+			"星期日",
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"邮件",
+			"广告",
+			"视频广告",
+			"直接访问",
+			"搜索引擎",
+		}, charts.PositionCenter),
+	)
+
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err = p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

examples/funnel_chart/main.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "funnel-chart.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	values := []float64{
+		100,
+		80,
+		60,
+		40,
+		20,
+		10,
+		0,
+	}
+	p, err := charts.FunnelRender(
+		values,
+		charts.TitleTextOptionFunc("Funnel"),
+		charts.LegendLabelsOptionFunc([]string{
+			"Show",
+			"Click",
+			"Visit",
+			"Inquiry",
+			"Order",
+			"Pay",
+			"Cancel",
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

examples/horizontal_bar_chart/main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "horizontal-bar-chart.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	values := [][]float64{
+		{
+			10,
+			30,
+			50,
+			70,
+			90,
+			110,
+			130,
+		},
+		{
+			20,
+			40,
+			60,
+			80,
+			100,
+			120,
+			140,
+		},
+	}
+	p, err := charts.HorizontalBarRender(
+		values,
+		charts.TitleTextOptionFunc("World Population"),
+		charts.PaddingOptionFunc(charts.Box{
+			Top:    20,
+			Right:  40,
+			Bottom: 20,
+			Left:   20,
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"2011",
+			"2012",
+		}),
+		charts.YAxisDataOptionFunc([]string{
+			"UN",
+			"Brazil",
+			"Indonesia",
+			"USA",
+			"India",
+			"China",
+			"World",
+		}),
+		func(opt *charts.ChartOption) {
+			opt.SeriesList[0].RoundRadius = 5
+		},
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

examples/line_chart/main.go

@@ -0,0 +1,124 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "line-chart.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	values := [][]float64{
+		{
+			120,
+			132,
+			101,
+			// 134,
+			charts.GetNullValue(),
+			90,
+			230,
+			210,
+		},
+		{
+			220,
+			182,
+			191,
+			234,
+			290,
+			330,
+			310,
+		},
+		{
+			150,
+			232,
+			201,
+			154,
+			190,
+			330,
+			410,
+		},
+		{
+			320,
+			332,
+			301,
+			334,
+			390,
+			330,
+			320,
+		},
+		{
+			820,
+			932,
+			901,
+			934,
+			1290,
+			1330,
+			1320,
+		},
+	}
+	p, err := charts.LineRender(
+		values,
+		charts.TitleTextOptionFunc("Line"),
+		charts.XAxisDataOptionFunc([]string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		}),
+		charts.LegendLabelsOptionFunc([]string{
+			"Email",
+			"Union Ads",
+			"Video Ads",
+			"Direct",
+			"Search Engine",
+		}, "50"),
+		func(opt *charts.ChartOption) {
+			opt.Legend.Padding = charts.Box{
+				Top:    5,
+				Bottom: 10,
+			}
+			opt.YAxisOptions = []charts.YAxisOption{
+				{
+					SplitLineShow: charts.FalseFlag(),
+				},
+			}
+			opt.SymbolShow = charts.FalseFlag()
+			opt.LineStrokeWidth = 1
+			opt.ValueFormatter = func(f float64) string {
+				return fmt.Sprintf("%.0f", f)
+			}
+		},
+	)
+
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

examples/painter/main.go

@@ -0,0 +1,607 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+
+	charts "git.smarteching.com/zeni/go-charts/v2"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "painter.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	p, err := charts.NewPainter(charts.PainterOptions{
+		Width:  600,
+		Height: 2000,
+		Type:   charts.ChartOutputPNG,
+	})
+	if err != nil {
+		panic(err)
+	}
+	// 背景色
+	p.SetBackground(p.Width(), p.Height(), drawing.ColorWhite)
+
+	top := 0
+
+	// 画线
+	p.SetDrawingStyle(charts.Style{
+		StrokeColor: drawing.ColorBlack,
+		FillColor:   drawing.ColorBlack,
+		StrokeWidth: 1,
+	})
+	p.LineStroke([]charts.Point{
+		{
+			X: 0,
+			Y: 0,
+		},
+		{
+			X: 100,
+			Y: 10,
+		},
+		{
+			X: 200,
+			Y: 0,
+		},
+		{
+			X: 300,
+			Y: 10,
+		},
+	})
+
+	// 圆滑曲线
+	// top += 50
+	// p.Child(charts.PainterPaddingOption(charts.Box{
+	// 	Top: top,
+	// })).SetDrawingStyle(charts.Style{
+	// 	StrokeColor: drawing.ColorBlack,
+	// 	FillColor:   drawing.ColorBlack,
+	// 	StrokeWidth: 1,
+	// }).SmoothLineStroke([]charts.Point{
+	// 	{
+	// 		X: 0,
+	// 		Y: 0,
+	// 	},
+	// 	{
+	// 		X: 100,
+	// 		Y: 10,
+	// 	},
+	// 	{
+	// 		X: 200,
+	// 		Y: 0,
+	// 	},
+	// 	{
+	// 		X: 300,
+	// 		Y: 10,
+	// 	},
+	// })
+
+	// 标线
+	top += 50
+	p.Child(charts.PainterPaddingOption(charts.Box{
+		Top: top,
+	})).SetDrawingStyle(charts.Style{
+		StrokeColor: drawing.ColorBlack,
+		FillColor:   drawing.ColorBlack,
+		StrokeWidth: 1,
+		StrokeDashArray: []float64{
+			4,
+			2,
+		},
+	}).MarkLine(0, 0, p.Width())
+
+	top += 60
+	// Polygon
+	p.Child(charts.PainterBoxOption(charts.Box{
+		Top: top,
+	})).SetDrawingStyle(charts.Style{
+		StrokeColor: drawing.ColorBlack,
+		FillColor:   drawing.ColorBlack,
+		StrokeWidth: 1,
+	}).Polygon(charts.Point{
+		X: 100,
+		Y: 0,
+	}, 50, 6)
+
+	// FillArea
+	top += 60
+	p.Child(charts.PainterPaddingOption(charts.Box{
+		Top: top,
+	})).SetDrawingStyle(charts.Style{
+		FillColor: drawing.ColorBlack,
+	}).FillArea([]charts.Point{
+		{
+			X: 0,
+			Y: 0,
+		},
+		{
+			X: 100,
+			Y: 0,
+		},
+		{
+			X: 150,
+			Y: 40,
+		},
+		{
+			X: 80,
+			Y: 30,
+		},
+		{
+			X: 0,
+			Y: 0,
+		},
+	})
+
+	// 坐标轴的点
+	top += 50
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   1,
+			Right:  p.Width() - 1,
+			Bottom: 20,
+		}),
+	).SetDrawingStyle(charts.Style{
+		StrokeColor: drawing.ColorBlack,
+		FillColor:   drawing.ColorBlack,
+		StrokeWidth: 1,
+	}).Ticks(charts.TicksOption{
+		Count:  7,
+		Length: 5,
+	})
+
+	// 坐标轴的点，每2格显示一个
+	top += 20
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   1,
+			Right:  p.Width() - 1,
+			Bottom: 20,
+		}),
+	).SetDrawingStyle(charts.Style{
+		StrokeColor: drawing.ColorBlack,
+		FillColor:   drawing.ColorBlack,
+		StrokeWidth: 1,
+	}).Ticks(charts.TicksOption{
+		Unit:   2,
+		Count:  7,
+		Length: 5,
+	})
+
+	// 坐标轴的点，纵向
+	top += 20
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   1,
+			Right:  p.Width() - 1,
+			Bottom: top + 100,
+		}),
+	).SetDrawingStyle(charts.Style{
+		StrokeColor: drawing.ColorBlack,
+		FillColor:   drawing.ColorBlack,
+		StrokeWidth: 1,
+	}).Ticks(charts.TicksOption{
+		Orient: charts.OrientVertical,
+		Count:  7,
+		Length: 5,
+	})
+
+	// 横向展示文本
+	top += 120
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   1,
+			Right:  p.Width() - 1,
+			Bottom: 20,
+		}),
+	).OverrideTextStyle(charts.Style{
+		FontColor: drawing.ColorBlack,
+		FontSize:  10,
+	}).MultiText(charts.MultiTextOption{
+		TextList: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+	})
+
+	// 横向显示文本，靠左
+	top += 20
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   1,
+			Right:  p.Width() - 1,
+			Bottom: 20,
+		}),
+	).OverrideTextStyle(charts.Style{
+		FontColor: drawing.ColorBlack,
+		FontSize:  10,
+	}).MultiText(charts.MultiTextOption{
+		Position: charts.PositionLeft,
+		TextList: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+	})
+
+	// 纵向显示文本
+	top += 20
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   1,
+			Right:  50,
+			Bottom: top + 150,
+		}),
+	).OverrideTextStyle(charts.Style{
+		FontColor: drawing.ColorBlack,
+		FontSize:  10,
+	}).MultiText(charts.MultiTextOption{
+		Orient: charts.OrientVertical,
+		Align:  charts.AlignRight,
+		TextList: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+	})
+	// 纵向 文本居中
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   50,
+			Right:  100,
+			Bottom: top + 150,
+		}),
+	).OverrideTextStyle(charts.Style{
+		FontColor: drawing.ColorBlack,
+		FontSize:  10,
+	}).MultiText(charts.MultiTextOption{
+		Orient: charts.OrientVertical,
+		Align:  charts.AlignCenter,
+		TextList: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+	})
+	// 纵向 文本置顶
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   100,
+			Right:  150,
+			Bottom: top + 150,
+		}),
+	).OverrideTextStyle(charts.Style{
+		FontColor: drawing.ColorBlack,
+		FontSize:  10,
+	}).MultiText(charts.MultiTextOption{
+		Orient:   charts.OrientVertical,
+		Position: charts.PositionTop,
+		Align:    charts.AlignCenter,
+		TextList: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+	})
+
+	// grid
+	top += 150
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   1,
+			Right:  p.Width() - 1,
+			Bottom: top + 100,
+		}),
+	).OverrideTextStyle(charts.Style{
+		FontColor: drawing.ColorBlack,
+		FontSize:  10,
+	}).Grid(charts.GridOption{
+		Column:            8,
+		IgnoreColumnLines: []int{0, 8},
+		Row:               8,
+		IgnoreRowLines:    []int{0, 8},
+	})
+
+	// dots
+	top += 100
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   1,
+			Right:  p.Width() - 1,
+			Bottom: top + 20,
+		}),
+	).OverrideDrawingStyle(charts.Style{
+		FillColor:   drawing.ColorWhite,
+		StrokeColor: drawing.ColorBlack,
+		StrokeWidth: 1,
+	}).Dots([]charts.Point{
+		{
+			X: 0,
+			Y: 0,
+		},
+		{
+			X: 50,
+			Y: 0,
+		},
+		{
+			X: 100,
+			Y: 10,
+		},
+	})
+
+	// rect
+	top += 30
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   1,
+			Right:  200,
+			Bottom: top + 50,
+		}),
+	).OverrideDrawingStyle(charts.Style{
+		StrokeColor: drawing.ColorBlack,
+		FillColor:   drawing.ColorBlack,
+	}).Rect(charts.Box{
+		Left:   10,
+		Top:    0,
+		Right:  110,
+		Bottom: 20,
+	})
+	// legend line dot
+	p.Child(
+		charts.PainterBoxOption(charts.Box{
+			Top:    top,
+			Left:   200,
+			Right:  p.Width() - 1,
+			Bottom: top + 50,
+		}),
+	).OverrideDrawingStyle(charts.Style{
+		StrokeColor: drawing.ColorBlack,
+		FillColor:   drawing.ColorBlack,
+	}).LegendLineDot(charts.Box{
+		Left:   10,
+		Top:    0,
+		Right:  50,
+		Bottom: 20,
+	})
+
+	// grid
+	top += 50
+	charts.NewGridPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   1,
+		Right:  p.Width() - 1,
+		Bottom: top + 100,
+	})), charts.GridPainterOption{
+		Row:            5,
+		IgnoreFirstRow: true,
+		IgnoreLastRow:  true,
+		StrokeColor:    drawing.ColorBlue,
+	}).Render()
+
+	// legend
+	top += 100
+	charts.NewLegendPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   1,
+		Right:  p.Width() - 1,
+		Bottom: top + 30,
+	})), charts.LegendOption{
+		Left: "10",
+		Data: []string{
+			"Email",
+			"Union Ads",
+			"Video Ads",
+			"Direct",
+		},
+		FontSize:  12,
+		FontColor: drawing.ColorBlack,
+	}).Render()
+
+	// legend
+	top += 30
+	charts.NewLegendPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   1,
+		Right:  p.Width() - 1,
+		Bottom: top + 30,
+	})), charts.LegendOption{
+		Left: charts.PositionRight,
+		Data: []string{
+			"Email",
+			"Union Ads",
+			"Video Ads",
+			"Direct",
+		},
+		Align:     charts.AlignRight,
+		FontSize:  16,
+		Icon:      charts.IconRect,
+		FontColor: drawing.ColorBlack,
+	}).Render()
+
+	// legend
+	top += 30
+	charts.NewLegendPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   1,
+		Right:  p.Width() - 1,
+		Bottom: top + 100,
+	})), charts.LegendOption{
+		Top: "10",
+		Data: []string{
+			"Email",
+			"Union Ads",
+			"Video Ads",
+			"Direct",
+		},
+		Orient:    charts.OrientVertical,
+		FontSize:  12,
+		FontColor: drawing.ColorBlack,
+	}).Render()
+
+	// axis bottom
+	top += 100
+	charts.NewAxisPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   1,
+		Right:  p.Width() - 1,
+		Bottom: top + 50,
+	})), charts.AxisOption{
+		Data: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+		StrokeColor: drawing.ColorBlack,
+		FontSize:    12,
+		FontColor:   drawing.ColorBlack,
+	}).Render()
+
+	// axis top
+	top += 50
+	charts.NewAxisPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   1,
+		Right:  p.Width() - 1,
+		Bottom: top + 50,
+	})), charts.AxisOption{
+		Position:    charts.PositionTop,
+		BoundaryGap: charts.FalseFlag(),
+		Data: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+		StrokeColor: drawing.ColorBlack,
+		FontSize:    12,
+		FontColor:   drawing.ColorBlack,
+	}).Render()
+
+	// axis left
+	top += 50
+	charts.NewAxisPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   10,
+		Right:  60,
+		Bottom: top + 200,
+	})), charts.AxisOption{
+		Position: charts.PositionLeft,
+		Data: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+		StrokeColor: drawing.ColorBlack,
+		FontSize:    12,
+		FontColor:   drawing.ColorBlack,
+	}).Render()
+	// axis right
+	charts.NewAxisPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   100,
+		Right:  150,
+		Bottom: top + 200,
+	})), charts.AxisOption{
+		Position: charts.PositionRight,
+		Data: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+		StrokeColor: drawing.ColorBlack,
+		FontSize:    12,
+		FontColor:   drawing.ColorBlack,
+	}).Render()
+
+	// axis left no tick
+	charts.NewAxisPainter(p.Child(charts.PainterBoxOption(charts.Box{
+		Top:    top,
+		Left:   150,
+		Right:  300,
+		Bottom: top + 200,
+	})), charts.AxisOption{
+		BoundaryGap: charts.FalseFlag(),
+		Position:    charts.PositionLeft,
+		Data: []string{
+			"Mon",
+			"Tue",
+			"Wed",
+			"Thu",
+			"Fri",
+			"Sat",
+			"Sun",
+		},
+		FontSize:       12,
+		FontColor:      drawing.ColorBlack,
+		SplitLineShow:  true,
+		SplitLineColor: drawing.ColorBlack.WithAlpha(100),
+	}).Render()
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

examples/pie_chart/main.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "pie-chart.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	values := []float64{
+		1048,
+		735,
+		580,
+		484,
+		300,
+	}
+	p, err := charts.PieRender(
+		values,
+		charts.TitleOptionFunc(charts.TitleOption{
+			Text:    "Rainfall vs Evaporation",
+			Subtext: "Fake Data",
+			Left:    charts.PositionCenter,
+		}),
+		charts.PaddingOptionFunc(charts.Box{
+			Top:    20,
+			Right:  20,
+			Bottom: 20,
+			Left:   20,
+		}),
+		charts.LegendOptionFunc(charts.LegendOption{
+			Orient: charts.OrientVertical,
+			Data: []string{
+				"Search Engine",
+				"Direct",
+				"Email",
+				"Union Ads",
+				"Video Ads",
+			},
+			Left: charts.PositionLeft,
+		}),
+		charts.PieSeriesShowLabel(),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

examples/radar_chart/main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "radar-chart.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	values := [][]float64{
+		{
+			4200,
+			3000,
+			20000,
+			35000,
+			50000,
+			18000,
+		},
+		{
+			5000,
+			14000,
+			28000,
+			26000,
+			42000,
+			21000,
+		},
+	}
+	p, err := charts.RadarRender(
+		values,
+		charts.TitleTextOptionFunc("Basic Radar Chart"),
+		charts.LegendLabelsOptionFunc([]string{
+			"Allocated Budget",
+			"Actual Spending",
+		}),
+		charts.RadarIndicatorOptionFunc([]string{
+			"Sales",
+			"Administration",
+			"Information Technology",
+			"Customer Support",
+			"Development",
+			"Marketing",
+		}, []float64{
+			6500,
+			16000,
+			30000,
+			38000,
+			52000,
+			25000,
+		}),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

examples/table/main.go

@@ -0,0 +1,178 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+func writeFile(buf []byte, filename string) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, filename)
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	// charts.SetDefaultTableSetting(charts.TableDarkThemeSetting)
+	charts.SetDefaultWidth(810)
+	header := []string{
+		"Name",
+		"Age",
+		"Address",
+		"Tag",
+		"Action",
+	}
+	data := [][]string{
+		{
+			"John Brown",
+			"32",
+			"New York No. 1 Lake Park",
+			"nice, developer",
+			"Send Mail",
+		},
+		{
+			"Jim Green	",
+			"42",
+			"London No. 1 Lake Park",
+			"wow",
+			"Send Mail",
+		},
+		{
+			"Joe Black	",
+			"32",
+			"Sidney No. 1 Lake Park",
+			"cool, teacher",
+			"Send Mail",
+		},
+	}
+	spans := map[int]int{
+		0: 2,
+		1: 1,
+		// 设置第三列的span
+		2: 3,
+		3: 2,
+		4: 2,
+	}
+	p, err := charts.TableRender(
+		header,
+		data,
+		spans,
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf, "table.png")
+	if err != nil {
+		panic(err)
+	}
+
+	bgColor := charts.Color{
+		R: 16,
+		G: 22,
+		B: 30,
+		A: 255,
+	}
+	p, err = charts.TableOptionRender(charts.TableChartOption{
+		Header: []string{
+			"Name",
+			"Price",
+			"Change",
+		},
+		BackgroundColor:       bgColor,
+		HeaderBackgroundColor: bgColor,
+		RowBackgroundColors: []charts.Color{
+			bgColor,
+		},
+		HeaderFontColor: drawing.ColorWhite,
+		FontColor:       drawing.ColorWhite,
+		Padding: charts.Box{
+			Top:    15,
+			Right:  10,
+			Bottom: 15,
+			Left:   10,
+		},
+		Data: [][]string{
+			{
+				"Datadog Inc",
+				"97.32",
+				"-7.49%",
+			},
+			{
+				"Hashicorp Inc",
+				"28.66",
+				"-9.25%",
+			},
+			{
+				"Gitlab Inc",
+				"51.63",
+				"+4.32%",
+			},
+		},
+		TextAligns: []string{
+			"",
+			charts.AlignRight,
+			charts.AlignRight,
+		},
+		CellStyle: func(tc charts.TableCell) *charts.Style {
+			column := tc.Column
+			if column != 2 {
+				return nil
+			}
+			value, _ := strconv.ParseFloat(strings.Replace(tc.Text, "%", "", 1), 64)
+			if value == 0 {
+				return nil
+			}
+			style := charts.Style{
+				Padding: charts.Box{
+					Bottom: 5,
+				},
+			}
+			if value > 0 {
+				style.FillColor = charts.Color{
+					R: 179,
+					G: 53,
+					B: 20,
+					A: 255,
+				}
+			} else if value < 0 {
+				style.FillColor = charts.Color{
+					R: 33,
+					G: 124,
+					B: 50,
+					A: 255,
+				}
+			}
+			return &style
+		},
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err = p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf, "table-color.png")
+	if err != nil {
+		panic(err)
+	}
+}

examples/time_line_chart/main.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"crypto/rand"
+	"fmt"
+	"math/big"
+	"os"
+	"path/filepath"
+	"time"
+
+	"git.smarteching.com/zeni/go-charts/v2"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "time-line-chart.png")
+	err = os.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	xAxisValue := []string{}
+	values := []float64{}
+	now := time.Now()
+	firstAxis := 0
+	for i := 0; i < 300; i++ {
+		// 设置首个axis为xx:00的时间点
+		if firstAxis == 0 && now.Minute() == 0 {
+			firstAxis = i
+		}
+		xAxisValue = append(xAxisValue, now.Format("15:04"))
+		now = now.Add(time.Minute)
+		value, _ := rand.Int(rand.Reader, big.NewInt(100))
+		values = append(values, float64(value.Int64()))
+	}
+	p, err := charts.LineRender(
+		[][]float64{
+			values,
+		},
+		charts.TitleTextOptionFunc("Line"),
+		charts.XAxisDataOptionFunc(xAxisValue, charts.FalseFlag()),
+		charts.LegendLabelsOptionFunc([]string{
+			"Demo",
+		}, "50"),
+		func(opt *charts.ChartOption) {
+			opt.XAxis.FirstAxis = firstAxis
+			// 必须要比计算得来的最小值更大(每60分钟)
+			opt.XAxis.SplitNumber = 60
+			opt.Legend.Padding = charts.Box{
+				Top:    5,
+				Bottom: 10,
+			}
+			opt.SymbolShow = charts.FalseFlag()
+			opt.LineStrokeWidth = 1
+			opt.ValueFormatter = func(f float64) string {
+				return fmt.Sprintf("%.0f", f)
+			}
+		},
+	)
+
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}

font.go

@@ -0,0 +1,78 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"errors"
+	"sync"
+
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2/roboto"
+)
+
+var fonts = sync.Map{}
+var ErrFontNotExists = errors.New("font is not exists")
+var defaultFontFamily = "defaultFontFamily"
+
+func init() {
+	name := "roboto"
+	_ = InstallFont(name, roboto.Roboto)
+	font, _ := GetFont(name)
+	SetDefaultFont(font)
+}
+
+// InstallFont installs the font for charts
+func InstallFont(fontFamily string, data []byte) error {
+	font, err := truetype.Parse(data)
+	if err != nil {
+		return err
+	}
+	fonts.Store(fontFamily, font)
+	return nil
+}
+
+// GetDefaultFont get default font
+func GetDefaultFont() (*truetype.Font, error) {
+	return GetFont(defaultFontFamily)
+}
+
+// SetDefaultFont set default font
+func SetDefaultFont(font *truetype.Font) {
+	if font == nil {
+		return
+	}
+	fonts.Store(defaultFontFamily, font)
+}
+
+// GetFont get the font by font family
+func GetFont(fontFamily string) (*truetype.Font, error) {
+	value, ok := fonts.Load(fontFamily)
+	if !ok {
+		return nil, ErrFontNotExists
+	}
+	f, ok := value.(*truetype.Font)
+	if !ok {
+		return nil, ErrFontNotExists
+	}
+	return f, nil
+}

font_test.go

@@ -0,0 +1,42 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"git.smarteching.com/zeni/go-chart/v2/roboto"
+)
+
+func TestInstallFont(t *testing.T) {
+	assert := assert.New(t)
+
+	fontFamily := "test"
+	err := InstallFont(fontFamily, roboto.Roboto)
+	assert.Nil(err)
+
+	font, err := GetFont(fontFamily)
+	assert.Nil(err)
+	assert.NotNil(font)
+}

funnel_chart.go

@@ -0,0 +1,192 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"github.com/golang/freetype/truetype"
+)
+
+type funnelChart struct {
+	p   *Painter
+	opt *FunnelChartOption
+}
+
+// NewFunnelSeriesList returns a series list for funnel
+func NewFunnelSeriesList(values []float64) SeriesList {
+	seriesList := make(SeriesList, len(values))
+	for index, value := range values {
+		seriesList[index] = NewSeriesFromValues([]float64{
+			value,
+		}, ChartTypeFunnel)
+	}
+	return seriesList
+}
+
+// NewFunnelChart returns a funnel chart renderer
+func NewFunnelChart(p *Painter, opt FunnelChartOption) *funnelChart {
+	if opt.Theme == nil {
+		opt.Theme = defaultTheme
+	}
+	return &funnelChart{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+type FunnelChartOption struct {
+	// The theme
+	Theme ColorPalette
+	// The font size
+	Font *truetype.Font
+	// The data series list
+	SeriesList SeriesList
+	// The padding of line chart
+	Padding Box
+	// The option of title
+	Title TitleOption
+	// The legend option
+	Legend LegendOption
+}
+
+func (f *funnelChart) render(result *defaultRenderResult, seriesList SeriesList) (Box, error) {
+	opt := f.opt
+	seriesPainter := result.seriesPainter
+	max := seriesList[0].Data[0].Value
+	min := float64(0)
+	for _, item := range seriesList {
+		if item.Max != nil {
+			max = *item.Max
+		}
+		if item.Min != nil {
+			min = *item.Min
+		}
+	}
+	theme := opt.Theme
+	gap := 2
+	height := seriesPainter.Height()
+	width := seriesPainter.Width()
+	count := len(seriesList)
+
+	h := (height - gap*(count-1)) / count
+
+	y := 0
+	widthList := make([]int, len(seriesList))
+	textList := make([]string, len(seriesList))
+	seriesNames := seriesList.Names()
+	offset := max - min
+	for index, item := range seriesList {
+		value := item.Data[0].Value
+		// 最大最小值一致则为100%
+		widthPercent := 100.0
+		if offset != 0 {
+			widthPercent = (value - min) / offset
+		}
+		w := int(widthPercent * float64(width))
+		widthList[index] = w
+		// 如果最大值为0，则占比100%
+		percent := 1.0
+		if max != 0 {
+			percent = value / max
+		}
+		textList[index] = NewFunnelLabelFormatter(seriesNames, item.Label.Formatter)(index, value, percent)
+	}
+
+	for index, w := range widthList {
+		series := seriesList[index]
+		nextWidth := 0
+		if index+1 < len(widthList) {
+			nextWidth = widthList[index+1]
+		}
+		topStartX := (width - w) >> 1
+		topEndX := topStartX + w
+		bottomStartX := (width - nextWidth) >> 1
+		bottomEndX := bottomStartX + nextWidth
+		points := []Point{
+			{
+				X: topStartX,
+				Y: y,
+			},
+			{
+				X: topEndX,
+				Y: y,
+			},
+			{
+				X: bottomEndX,
+				Y: y + h,
+			},
+			{
+				X: bottomStartX,
+				Y: y + h,
+			},
+			{
+				X: topStartX,
+				Y: y,
+			},
+		}
+		color := theme.GetSeriesColor(series.index)
+
+		seriesPainter.OverrideDrawingStyle(Style{
+			FillColor: color,
+		}).FillArea(points)
+
+		// 文本
+		text := textList[index]
+		seriesPainter.OverrideTextStyle(Style{
+			FontColor: theme.GetTextColor(),
+			FontSize:  labelFontSize,
+			Font:      opt.Font,
+		})
+		textBox := seriesPainter.MeasureText(text)
+		textX := width>>1 - textBox.Width()>>1
+		textY := y + h>>1
+		seriesPainter.Text(text, textX, textY)
+		y += (h + gap)
+	}
+
+	return f.p.box, nil
+}
+
+func (f *funnelChart) Render() (Box, error) {
+	p := f.p
+	opt := f.opt
+	renderResult, err := defaultRender(p, defaultRenderOption{
+		Theme:      opt.Theme,
+		Padding:    opt.Padding,
+		SeriesList: opt.SeriesList,
+		XAxis: XAxisOption{
+			Show: FalseFlag(),
+		},
+		YAxisOptions: []YAxisOption{
+			{
+				Show: FalseFlag(),
+			},
+		},
+		TitleOption:  opt.Title,
+		LegendOption: opt.Legend,
+	})
+	if err != nil {
+		return BoxZero, err
+	}
+	seriesList := opt.SeriesList.Filter(ChartTypeFunnel)
+	return f.render(renderResult, seriesList)
+}

funnel_chart_test.go

@@ -0,0 +1,79 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFunnelChart(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		render func(*Painter) ([]byte, error)
+		result string
+	}{
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewFunnelChart(p, FunnelChartOption{
+					SeriesList: NewFunnelSeriesList([]float64{
+						100,
+						80,
+						60,
+						40,
+						20,
+					}),
+					Legend: NewLegendOption([]string{
+						"Show",
+						"Click",
+						"Visit",
+						"Inquiry",
+						"Order",
+					}),
+					Title: TitleOption{
+						Text: "Funnel",
+					},
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 0 0\nL 600 0\nL 600 400\nL 0 400\nL 0 0\" style=\"stroke-width:0;stroke:none;fill:rgba(255,255,255,1.0)\"/><path  d=\"M 86 9\nL 116 9\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><circle cx=\"101\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><text x=\"118\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Show</text><path  d=\"M 176 9\nL 206 9\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><circle cx=\"191\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><text x=\"208\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Click</text><path  d=\"M 262 9\nL 292 9\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><circle cx=\"277\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><text x=\"294\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Visit</text><path  d=\"M 345 9\nL 375 9\" style=\"stroke-width:3;stroke:rgba(238,102,102,1.0);fill:rgba(238,102,102,1.0)\"/><circle cx=\"360\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(238,102,102,1.0);fill:rgba(238,102,102,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(238,102,102,1.0);fill:rgba(238,102,102,1.0)\"/><text x=\"377\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Inquiry</text><path  d=\"M 444 9\nL 474 9\" style=\"stroke-width:3;stroke:rgba(115,192,222,1.0);fill:rgba(115,192,222,1.0)\"/><circle cx=\"459\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(115,192,222,1.0);fill:rgba(115,192,222,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(115,192,222,1.0);fill:rgba(115,192,222,1.0)\"/><text x=\"476\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Order</text><text x=\"0\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Funnel</text><path  d=\"M 0 35\nL 600 35\nL 540 100\nL 60 100\nL 0 35\" style=\"stroke-width:0;stroke:none;fill:rgba(84,112,198,1.0)\"/><text x=\"280\" y=\"67\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">(100%)</text><path  d=\"M 60 102\nL 540 102\nL 480 167\nL 120 167\nL 60 102\" style=\"stroke-width:0;stroke:none;fill:rgba(145,204,117,1.0)\"/><text x=\"284\" y=\"134\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">(80%)</text><path  d=\"M 120 169\nL 480 169\nL 420 234\nL 180 234\nL 120 169\" style=\"stroke-width:0;stroke:none;fill:rgba(250,200,88,1.0)\"/><text x=\"284\" y=\"201\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">(60%)</text><path  d=\"M 180 236\nL 420 236\nL 360 301\nL 240 301\nL 180 236\" style=\"stroke-width:0;stroke:none;fill:rgba(238,102,102,1.0)\"/><text x=\"284\" y=\"268\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">(40%)</text><path  d=\"M 240 303\nL 360 303\nL 300 368\nL 300 368\nL 240 303\" style=\"stroke-width:0;stroke:none;fill:rgba(115,192,222,1.0)\"/><text x=\"284\" y=\"335\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">(20%)</text></svg>",
+		},
+	}
+
+	for _, tt := range tests {
+		p, err := NewPainter(PainterOptions{
+			Type:   ChartOutputSVG,
+			Width:  600,
+			Height: 400,
+		}, PainterThemeOption(defaultTheme))
+		assert.Nil(err)
+		data, err := tt.render(p)
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}

go.mod

@@ -1,22 +1,17 @@
-module github.com/vicanso/go-charts-web
+module git.smarteching.com/zeni/go-charts/v2
 
-go 1.19
+go 1.24.1
 
 require (
-	github.com/vicanso/elton v1.10.0
-	github.com/vicanso/go-charts/v2 v2.6.0
+	git.smarteching.com/zeni/go-chart/v2 v2.1.4
+	github.com/dustin/go-humanize v1.0.1
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0
+	github.com/stretchr/testify v1.10.0
 )
 
 require (
-	github.com/andybalholm/brotli v1.0.4 // indirect
-	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
-	github.com/tidwall/gjson v1.14.4 // indirect
-	github.com/tidwall/match v1.1.1 // indirect
-	github.com/tidwall/pretty v1.2.0 // indirect
-	github.com/vicanso/hes v0.6.1 // indirect
-	github.com/vicanso/intranet-ip v0.1.0 // indirect
-	github.com/vicanso/keygrip v1.2.1 // indirect
-	github.com/wcharczuk/go-chart/v2 v2.1.0 // indirect
-	golang.org/x/image v0.0.0-20200927104501-e162460cd6b5 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/image v0.21.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,6 +1,5 @@
-github.com/andybalholm/brotli v1.0.4 h1:V7DdXeJtZscaqfNuAdSRuRFzuiKlHSC/Zh3zl9qY3JY=
-github.com/andybalholm/brotli v1.0.4/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+git.smarteching.com/zeni/go-chart/v2 v2.1.4 h1:pF06+F6eqJLIG8uMiTVPR5TygPGMjM/FHMzTxmu5V/Q=
+git.smarteching.com/zeni/go-chart/v2 v2.1.4/go.mod h1:b3ueW9h3pGGXyhkormZAvilHaG4+mQti+bMNPdQBeOQ=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
@@ -9,37 +8,11 @@ github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF0
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
-github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
-github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
-github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
-github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-github.com/tidwall/gjson v1.14.4 h1:uo0p8EbA09J7RQaflQ1aBRffTR7xedD2bcIVSYxLnkM=
-github.com/tidwall/gjson v1.14.4/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
-github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
-github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
-github.com/tidwall/pretty v1.2.0 h1:RWIZEg2iJ8/g6fDDYzMpobmaoGh5OLl4AXtGUGPcqCs=
-github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
-github.com/vicanso/elton v1.10.0 h1:Qd6Dr5sarzkij+Vdgvtsd08jaNAKuZpBDpyPtKzESaY=
-github.com/vicanso/elton v1.10.0/go.mod h1:GnFxH3+Vtz0HQbhGhCmssbdi67+yLjFOUbZDdB8mRcQ=
-github.com/vicanso/go-charts/v2 v2.6.0 h1:nDaJuIr4pc1leQVjwmSXIMSmRvrTr5hUwZaxG3GExKI=
-github.com/vicanso/go-charts/v2 v2.6.0/go.mod h1:aEuuwzCT+p/Pd8YnAPMEV+sMKjpKK6anH1u6CxiboIw=
-github.com/vicanso/hes v0.6.1 h1:BRGUDhV2sJYMieJf4dgxFXjvuhDgUWBsINELcti0Z8M=
-github.com/vicanso/hes v0.6.1/go.mod h1:awwBbvcDTk8APxRmiV7Hxrir89/iCxgB6RMeLc5toh0=
-github.com/vicanso/intranet-ip v0.1.0 h1:UeoxilO2VDIkeZZxmu6aT+f5o79mfGdsSdwoEv75nYo=
-github.com/vicanso/intranet-ip v0.1.0/go.mod h1:N1yrHdDYWNsOs5V374DuAJHba+d2dxUDcjVALgIlfOg=
-github.com/vicanso/keygrip v1.2.1 h1:876fXDwGJqxdi4JxZ1lNGBxYswyLZotrs7AA2QWcLeY=
-github.com/vicanso/keygrip v1.2.1/go.mod h1:tfB5az1yqold78zotkzNugk3sV+QW5m71CFz3zg9eeo=
-github.com/wcharczuk/go-chart/v2 v2.1.0 h1:tY2slqVQ6bN+yHSnDYwZebLQFkphK4WNrVwnt7CJZ2I=
-github.com/wcharczuk/go-chart/v2 v2.1.0/go.mod h1:yx7MvAVNcP/kN9lKXM/NTce4au4DFN99j6i1OwDclNA=
-golang.org/x/image v0.0.0-20200927104501-e162460cd6b5 h1:QelT11PB4FXiDEXucrfNckHoFxwt8USGY1ajP1ZF5lM=
-golang.org/x/image v0.0.0-20200927104501-e162460cd6b5/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+golang.org/x/image v0.21.0 h1:c5qV36ajHpdj4Qi0GnE0jUc/yuo33OLFaa0d+crTD5s=
+golang.org/x/image v0.21.0/go.mod h1:vUbsLavqK/W303ZroQQVKQ+Af3Yl6Uz1Ppu5J/cLz78=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

grid.go

@@ -0,0 +1,92 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+type gridPainter struct {
+	p   *Painter
+	opt *GridPainterOption
+}
+
+type GridPainterOption struct {
+	// The stroke width
+	StrokeWidth float64
+	// The stroke color
+	StrokeColor Color
+	// The spans of column
+	ColumnSpans []int
+	// The column of grid
+	Column int
+	// The row of grid
+	Row int
+	// Ignore first row
+	IgnoreFirstRow bool
+	// Ignore last row
+	IgnoreLastRow bool
+	// Ignore first column
+	IgnoreFirstColumn bool
+	// Ignore last column
+	IgnoreLastColumn bool
+}
+
+// NewGridPainter returns new a grid renderer
+func NewGridPainter(p *Painter, opt GridPainterOption) *gridPainter {
+	return &gridPainter{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+func (g *gridPainter) Render() (Box, error) {
+	opt := g.opt
+	ignoreColumnLines := make([]int, 0)
+	if opt.IgnoreFirstColumn {
+		ignoreColumnLines = append(ignoreColumnLines, 0)
+	}
+	if opt.IgnoreLastColumn {
+		ignoreColumnLines = append(ignoreColumnLines, opt.Column)
+	}
+	ignoreRowLines := make([]int, 0)
+	if opt.IgnoreFirstRow {
+		ignoreRowLines = append(ignoreRowLines, 0)
+	}
+	if opt.IgnoreLastRow {
+		ignoreRowLines = append(ignoreRowLines, opt.Row)
+	}
+	strokeWidth := opt.StrokeWidth
+	if strokeWidth <= 0 {
+		strokeWidth = 1
+	}
+
+	g.p.SetDrawingStyle(Style{
+		StrokeWidth: strokeWidth,
+		StrokeColor: opt.StrokeColor,
+	})
+	g.p.Grid(GridOption{
+		Column:            opt.Column,
+		ColumnSpans:       opt.ColumnSpans,
+		Row:               opt.Row,
+		IgnoreColumnLines: ignoreColumnLines,
+		IgnoreRowLines:    ignoreRowLines,
+	})
+	return g.p.box, nil
+}

grid_test.go

@@ -0,0 +1,87 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+func TestGrid(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		render func(*Painter) ([]byte, error)
+		result string
+	}{
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewGridPainter(p, GridPainterOption{
+					StrokeColor:       drawing.ColorBlack,
+					Column:            6,
+					Row:               6,
+					IgnoreFirstRow:    true,
+					IgnoreLastRow:     true,
+					IgnoreFirstColumn: true,
+					IgnoreLastColumn:  true,
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 100 0\nL 100 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 200 0\nL 200 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 300 0\nL 300 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 400 0\nL 400 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 500 0\nL 500 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 66\nL 600 66\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 133\nL 600 133\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 200\nL 600 200\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 266\nL 600 266\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 333\nL 600 333\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/></svg>",
+		},
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewGridPainter(p, GridPainterOption{
+					StrokeColor: drawing.ColorBlack,
+					ColumnSpans: []int{
+						2,
+						5,
+						3,
+					},
+					Row: 6,
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 0 0\nL 0 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 120 0\nL 120 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 420 0\nL 420 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 600 0\nL 600 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 0\nL 600 0\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 66\nL 600 66\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 133\nL 600 133\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 200\nL 600 200\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 266\nL 600 266\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 333\nL 600 333\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/><path  d=\"M 0 400\nL 600 400\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/></svg>",
+		},
+	}
+	for _, tt := range tests {
+		p, err := NewPainter(PainterOptions{
+			Type:   ChartOutputSVG,
+			Width:  600,
+			Height: 400,
+		}, PainterThemeOption(defaultTheme))
+		assert.Nil(err)
+		data, err := tt.render(p)
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}

horizontal_bar_chart.go

@@ -0,0 +1,216 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+type horizontalBarChart struct {
+	p   *Painter
+	opt *HorizontalBarChartOption
+}
+
+type HorizontalBarChartOption struct {
+	// The theme
+	Theme ColorPalette
+	// The font size
+	Font *truetype.Font
+	// The data series list
+	SeriesList SeriesList
+	// The x axis option
+	XAxis XAxisOption
+	// The padding of line chart
+	Padding Box
+	// The y axis option
+	YAxisOptions []YAxisOption
+	// The option of title
+	Title TitleOption
+	// The legend option
+	Legend    LegendOption
+	BarHeight int
+	// Margin of bar
+	BarMargin int
+}
+
+// NewHorizontalBarChart returns a horizontal bar chart renderer
+func NewHorizontalBarChart(p *Painter, opt HorizontalBarChartOption) *horizontalBarChart {
+	if opt.Theme == nil {
+		opt.Theme = defaultTheme
+	}
+	return &horizontalBarChart{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+func (h *horizontalBarChart) render(result *defaultRenderResult, seriesList SeriesList) (Box, error) {
+	p := h.p
+	opt := h.opt
+	seriesPainter := result.seriesPainter
+	yRange := result.axisRanges[0]
+	y0, y1 := yRange.GetRange(0)
+	height := int(y1 - y0)
+	// 每一块之间的margin
+	margin := 10
+	// 每一个bar之间的margin
+	barMargin := 5
+	if height < 20 {
+		margin = 2
+		barMargin = 2
+	} else if height < 50 {
+		margin = 5
+		barMargin = 3
+	}
+	if opt.BarMargin > 0 {
+		barMargin = opt.BarMargin
+	}
+	seriesCount := len(seriesList)
+	// 总的高度-两个margin-(总数-1)的barMargin
+	barHeight := (height - 2*margin - barMargin*(seriesCount-1)) / seriesCount
+	if opt.BarHeight > 0 && opt.BarHeight < barHeight {
+		barHeight = opt.BarHeight
+		margin = (height - seriesCount*barHeight - barMargin*(seriesCount-1)) / 2
+	}
+
+	theme := opt.Theme
+
+	max, min := seriesList.GetMaxMin(0)
+	xRange := NewRange(AxisRangeOption{
+		Painter:     p,
+		Min:         min,
+		Max:         max,
+		DivideCount: defaultAxisDivideCount,
+		Size:        seriesPainter.Width(),
+	})
+	seriesNames := seriesList.Names()
+
+	rendererList := []Renderer{}
+	for index := range seriesList {
+		series := seriesList[index]
+		seriesColor := theme.GetSeriesColor(series.index)
+		divideValues := yRange.AutoDivide()
+
+		var labelPainter *SeriesLabelPainter
+		if series.Label.Show {
+			labelPainter = NewSeriesLabelPainter(SeriesLabelPainterParams{
+				P:           seriesPainter,
+				SeriesNames: seriesNames,
+				Label:       series.Label,
+				Theme:       opt.Theme,
+				Font:        opt.Font,
+			})
+			rendererList = append(rendererList, labelPainter)
+		}
+		for j, item := range series.Data {
+			if j >= yRange.divideCount {
+				continue
+			}
+			// 显示位置切换
+			j = yRange.divideCount - j - 1
+			y := divideValues[j]
+			y += margin
+			if index != 0 {
+				y += index * (barHeight + barMargin)
+			}
+
+			w := int(xRange.getHeight(item.Value))
+			fillColor := seriesColor
+			if !item.Style.FillColor.IsZero() {
+				fillColor = item.Style.FillColor
+			}
+			right := w
+			if series.RoundRadius <= 0 {
+				seriesPainter.OverrideDrawingStyle(Style{
+					FillColor: fillColor,
+				}).Rect(chart.Box{
+					Top:    y,
+					Left:   0,
+					Right:  right,
+					Bottom: y + barHeight,
+				})
+			} else {
+				seriesPainter.OverrideDrawingStyle(Style{
+					FillColor: fillColor,
+				}).RoundedRect(chart.Box{
+					Top:    y,
+					Left:   0,
+					Right:  right,
+					Bottom: y + barHeight,
+				}, series.RoundRadius)
+			}
+
+			// 如果label不需要展示，则返回
+			if labelPainter == nil {
+				continue
+			}
+			labelValue := LabelValue{
+				Orient:    OrientHorizontal,
+				Index:     index,
+				Value:     item.Value,
+				X:         right,
+				Y:         y + barHeight>>1,
+				Offset:    series.Label.Offset,
+				FontColor: series.Label.Color,
+				FontSize:  series.Label.FontSize,
+			}
+			if series.Label.Position == PositionLeft {
+				labelValue.X = 0
+				if labelValue.FontColor.IsZero() {
+					if isLightColor(fillColor) {
+						labelValue.FontColor = defaultLightFontColor
+					} else {
+						labelValue.FontColor = defaultDarkFontColor
+					}
+				}
+			}
+			labelPainter.Add(labelValue)
+		}
+	}
+	err := doRender(rendererList...)
+	if err != nil {
+		return BoxZero, err
+	}
+	return p.box, nil
+}
+
+func (h *horizontalBarChart) Render() (Box, error) {
+	p := h.p
+	opt := h.opt
+	renderResult, err := defaultRender(p, defaultRenderOption{
+		Theme:        opt.Theme,
+		Padding:      opt.Padding,
+		SeriesList:   opt.SeriesList,
+		XAxis:        opt.XAxis,
+		YAxisOptions: opt.YAxisOptions,
+		TitleOption:  opt.Title,
+		LegendOption: opt.Legend,
+		axisReversed: true,
+	})
+	if err != nil {
+		return BoxZero, err
+	}
+	seriesList := opt.SeriesList.Filter(ChartTypeHorizontalBar)
+	return h.render(renderResult, seriesList)
+}

legend.go

@@ -0,0 +1,251 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"strconv"
+	"strings"
+)
+
+type legendPainter struct {
+	p   *Painter
+	opt *LegendOption
+}
+
+const IconRect = "rect"
+const IconLineDot = "lineDot"
+
+type LegendOption struct {
+	// The theme
+	Theme ColorPalette
+	// Text array of legend
+	Data []string
+	// Distance between legend component and the left side of the container.
+	// It can be pixel value: 20, percentage value: 20%,
+	// or position value: right, center.
+	Left string
+	// Distance between legend component and the top side of the container.
+	// It can be pixel value: 20.
+	Top string
+	// Legend marker and text aligning, it can be left or right, default is left.
+	Align string
+	// The layout orientation of legend, it can be horizontal or vertical, default is horizontal.
+	Orient string
+	// Icon of the legend.
+	Icon string
+	// Font size of legend text
+	FontSize float64
+	// FontColor color of legend text
+	FontColor Color
+	// The flag for show legend, set this to *false will hide legend
+	Show *bool
+	// The padding of legend
+	Padding Box
+}
+
+// NewLegendOption returns a legend option
+func NewLegendOption(labels []string, left ...string) LegendOption {
+	opt := LegendOption{
+		Data: labels,
+	}
+	if len(left) != 0 {
+		opt.Left = left[0]
+	}
+	return opt
+}
+
+// IsEmpty checks legend is empty
+func (opt *LegendOption) IsEmpty() bool {
+	isEmpty := true
+	for _, v := range opt.Data {
+		if v != "" {
+			isEmpty = false
+			break
+		}
+	}
+	return isEmpty
+}
+
+// NewLegendPainter returns a legend renderer
+func NewLegendPainter(p *Painter, opt LegendOption) *legendPainter {
+	return &legendPainter{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+func (l *legendPainter) Render() (Box, error) {
+	opt := l.opt
+	theme := opt.Theme
+	if opt.IsEmpty() ||
+		isFalse(opt.Show) {
+		return BoxZero, nil
+	}
+	if theme == nil {
+		theme = l.p.theme
+	}
+	if opt.FontSize == 0 {
+		opt.FontSize = theme.GetFontSize()
+	}
+	if opt.FontColor.IsZero() {
+		opt.FontColor = theme.GetTextColor()
+	}
+	if opt.Left == "" {
+		opt.Left = PositionCenter
+	}
+	padding := opt.Padding
+	if padding.IsZero() {
+		padding.Top = 5
+	}
+	p := l.p.Child(PainterPaddingOption(padding))
+	p.SetTextStyle(Style{
+		FontSize:  opt.FontSize,
+		FontColor: opt.FontColor,
+	})
+	measureList := make([]Box, len(opt.Data))
+	maxTextWidth := 0
+	for index, text := range opt.Data {
+		b := p.MeasureText(text)
+		if b.Width() > maxTextWidth {
+			maxTextWidth = b.Width()
+		}
+		measureList[index] = b
+	}
+
+	// 计算展示的宽高
+	width := 0
+	height := 0
+	offset := 20
+	textOffset := 2
+	legendWidth := 30
+	legendHeight := 20
+	itemMaxHeight := 0
+	for _, item := range measureList {
+		if item.Height() > itemMaxHeight {
+			itemMaxHeight = item.Height()
+		}
+		if opt.Orient == OrientVertical {
+			height += item.Height()
+		} else {
+			width += item.Width()
+		}
+	}
+	// 增加padding
+	itemMaxHeight += 10
+	if opt.Orient == OrientVertical {
+		width = maxTextWidth + textOffset + legendWidth
+		height = offset * len(opt.Data)
+	} else {
+		height = legendHeight
+		offsetValue := (len(opt.Data) - 1) * (offset + textOffset)
+		allLegendWidth := len(opt.Data) * legendWidth
+		width += (offsetValue + allLegendWidth)
+	}
+
+	// 计算开始的位置
+	left := 0
+	switch opt.Left {
+	case PositionRight:
+		left = p.Width() - width
+	case PositionCenter:
+		left = (p.Width() - width) >> 1
+	default:
+		if strings.HasSuffix(opt.Left, "%") {
+			value, _ := strconv.Atoi(strings.ReplaceAll(opt.Left, "%", ""))
+			left = p.Width() * value / 100
+		} else {
+			value, _ := strconv.Atoi(opt.Left)
+			left = value
+		}
+	}
+	top, _ := strconv.Atoi(opt.Top)
+
+	if left < 0 {
+		left = 0
+	}
+
+	x := int(left)
+	y := int(top) + 10
+	startY := y
+	x0 := x
+	y0 := y
+
+	drawIcon := func(top, left int) int {
+		if opt.Icon == IconRect {
+			p.Rect(Box{
+				Top:    top - legendHeight + 8,
+				Left:   left,
+				Right:  left + legendWidth,
+				Bottom: top + 1,
+			})
+		} else {
+			p.LegendLineDot(Box{
+				Top:    top + 1,
+				Left:   left,
+				Right:  left + legendWidth,
+				Bottom: top + legendHeight + 1,
+			})
+		}
+		return left + legendWidth
+	}
+	lastIndex := len(opt.Data) - 1
+	for index, text := range opt.Data {
+		color := theme.GetSeriesColor(index)
+		p.SetDrawingStyle(Style{
+			FillColor:   color,
+			StrokeColor: color,
+		})
+		itemWidth := x0 + measureList[index].Width() + textOffset + offset + legendWidth
+		if lastIndex == index {
+			itemWidth = x0 + measureList[index].Width() + legendWidth
+		}
+		if itemWidth > p.Width() {
+			x0 = 0
+			y += itemMaxHeight
+			y0 = y
+		}
+		if opt.Align != AlignRight {
+			x0 = drawIcon(y0, x0)
+			x0 += textOffset
+		}
+		p.Text(text, x0, y0)
+		x0 += measureList[index].Width()
+		if opt.Align == AlignRight {
+			x0 += textOffset
+			x0 = drawIcon(y0, x0)
+		}
+		if opt.Orient == OrientVertical {
+			y0 += offset
+			x0 = x
+		} else {
+			x0 += offset
+			y0 = y
+		}
+		height = y0 - startY + 10
+	}
+
+	return Box{
+		Right:  width,
+		Bottom: height + padding.Bottom + padding.Top,
+	}, nil
+}

legend_test.go

@@ -0,0 +1,102 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewLegend(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		render func(*Painter) ([]byte, error)
+		result string
+	}{
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewLegendPainter(p, LegendOption{
+					Data: []string{
+						"One",
+						"Two",
+						"Three",
+					},
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 184 9\nL 214 9\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><circle cx=\"199\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><text x=\"216\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">One</text><path  d=\"M 264 9\nL 294 9\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><circle cx=\"279\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><text x=\"296\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Two</text><path  d=\"M 346 9\nL 376 9\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><circle cx=\"361\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><text x=\"378\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Three</text></svg>",
+		},
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewLegendPainter(p, LegendOption{
+					Data: []string{
+						"One",
+						"Two",
+						"Three",
+					},
+					Left: PositionLeft,
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 0 9\nL 30 9\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><circle cx=\"15\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><text x=\"32\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">One</text><path  d=\"M 80 9\nL 110 9\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><circle cx=\"95\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><text x=\"112\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Two</text><path  d=\"M 162 9\nL 192 9\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><circle cx=\"177\" cy=\"9\" r=\"5\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><path  d=\"\" style=\"stroke-width:3;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><text x=\"194\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Three</text></svg>",
+		},
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewLegendPainter(p, LegendOption{
+					Data: []string{
+						"One",
+						"Two",
+						"Three",
+					},
+					Orient: OrientVertical,
+					Icon:   IconRect,
+					Left:   "10%",
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 60 3\nL 90 3\nL 90 16\nL 60 16\nL 60 3\" style=\"stroke-width:0;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><text x=\"92\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">One</text><path  d=\"M 60 23\nL 90 23\nL 90 36\nL 60 36\nL 60 23\" style=\"stroke-width:0;stroke:rgba(145,204,117,1.0);fill:rgba(145,204,117,1.0)\"/><text x=\"92\" y=\"35\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Two</text><path  d=\"M 60 43\nL 90 43\nL 90 56\nL 60 56\nL 60 43\" style=\"stroke-width:0;stroke:rgba(250,200,88,1.0);fill:rgba(250,200,88,1.0)\"/><text x=\"92\" y=\"55\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Three</text></svg>",
+		},
+	}
+	for _, tt := range tests {
+		p, err := NewPainter(PainterOptions{
+			Type:   ChartOutputSVG,
+			Width:  600,
+			Height: 400,
+		}, PainterThemeOption(defaultTheme))
+		assert.Nil(err)
+		data, err := tt.render(p)
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}

line_chart.go

@@ -0,0 +1,240 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"math"
+
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+type lineChart struct {
+	p   *Painter
+	opt *LineChartOption
+}
+
+// NewLineChart returns a line chart render
+func NewLineChart(p *Painter, opt LineChartOption) *lineChart {
+	if opt.Theme == nil {
+		opt.Theme = defaultTheme
+	}
+	return &lineChart{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+type LineChartOption struct {
+	// The theme
+	Theme ColorPalette
+	// The font size
+	Font *truetype.Font
+	// The data series list
+	SeriesList SeriesList
+	// The x axis option
+	XAxis XAxisOption
+	// The padding of line chart
+	Padding Box
+	// The y axis option
+	YAxisOptions []YAxisOption
+	// The option of title
+	Title TitleOption
+	// The legend option
+	Legend LegendOption
+	// The flag for show symbol of line, set this to *false will hide symbol
+	SymbolShow *bool
+	// The stroke width of line
+	StrokeWidth float64
+	// Fill the area of line
+	FillArea bool
+	// background is filled
+	backgroundIsFilled bool
+	// background fill (alpha) opacity
+	Opacity uint8
+}
+
+func (l *lineChart) render(result *defaultRenderResult, seriesList SeriesList) (Box, error) {
+	p := l.p
+	opt := l.opt
+	boundaryGap := true
+	if isFalse(opt.XAxis.BoundaryGap) {
+		boundaryGap = false
+	}
+
+	seriesPainter := result.seriesPainter
+
+	xDivideCount := len(opt.XAxis.Data)
+	if !boundaryGap {
+		xDivideCount--
+	}
+	xDivideValues := autoDivide(seriesPainter.Width(), xDivideCount)
+	xValues := make([]int, len(xDivideValues)-1)
+	if boundaryGap {
+		for i := 0; i < len(xDivideValues)-1; i++ {
+			xValues[i] = (xDivideValues[i] + xDivideValues[i+1]) >> 1
+		}
+	} else {
+		xValues = xDivideValues
+	}
+	markPointPainter := NewMarkPointPainter(seriesPainter)
+	markLinePainter := NewMarkLinePainter(seriesPainter)
+	rendererList := []Renderer{
+		markPointPainter,
+		markLinePainter,
+	}
+	strokeWidth := opt.StrokeWidth
+	if strokeWidth == 0 {
+		strokeWidth = defaultStrokeWidth
+	}
+	seriesNames := seriesList.Names()
+	for index := range seriesList {
+		series := seriesList[index]
+		seriesColor := opt.Theme.GetSeriesColor(series.index)
+		drawingStyle := Style{
+			StrokeColor: seriesColor,
+			StrokeWidth: strokeWidth,
+		}
+		if len(series.Style.StrokeDashArray) > 0 {
+			drawingStyle.StrokeDashArray = series.Style.StrokeDashArray
+		}
+
+		yRange := result.axisRanges[series.AxisIndex]
+		points := make([]Point, 0)
+		var labelPainter *SeriesLabelPainter
+		if series.Label.Show {
+			labelPainter = NewSeriesLabelPainter(SeriesLabelPainterParams{
+				P:           seriesPainter,
+				SeriesNames: seriesNames,
+				Label:       series.Label,
+				Theme:       opt.Theme,
+				Font:        opt.Font,
+			})
+			rendererList = append(rendererList, labelPainter)
+		}
+		for i, item := range series.Data {
+			h := yRange.getRestHeight(item.Value)
+			if item.Value == nullValue {
+				h = int(math.MaxInt32)
+			}
+			p := Point{
+				X: xValues[i],
+				Y: h,
+			}
+			points = append(points, p)
+
+			// 如果label不需要展示，则返回
+			if labelPainter == nil {
+				continue
+			}
+			labelPainter.Add(LabelValue{
+				Index: index,
+				Value: item.Value,
+				X:     p.X,
+				Y:     p.Y,
+				// 字体大小
+				FontSize: series.Label.FontSize,
+			})
+		}
+		// 如果需要填充区域
+		if opt.FillArea {
+			areaPoints := make([]Point, len(points))
+			copy(areaPoints, points)
+			bottomY := yRange.getRestHeight(yRange.min)
+			var opacity uint8 = 200
+			if opt.Opacity != 0 {
+				opacity = opt.Opacity
+			}
+			areaPoints = append(areaPoints, Point{
+				X: areaPoints[len(areaPoints)-1].X,
+				Y: bottomY,
+			}, Point{
+				X: areaPoints[0].X,
+				Y: bottomY,
+			}, areaPoints[0])
+			seriesPainter.SetDrawingStyle(Style{
+				FillColor: seriesColor.WithAlpha(opacity),
+			})
+			seriesPainter.FillArea(areaPoints)
+		}
+		seriesPainter.SetDrawingStyle(drawingStyle)
+
+		// 画线
+		seriesPainter.LineStroke(points)
+
+		// 画点
+		if opt.Theme.IsDark() {
+			drawingStyle.FillColor = drawingStyle.StrokeColor
+		} else {
+			drawingStyle.FillColor = drawing.ColorWhite
+		}
+		drawingStyle.StrokeWidth = 1
+		seriesPainter.SetDrawingStyle(drawingStyle)
+		if !isFalse(opt.SymbolShow) {
+			seriesPainter.Dots(points)
+		}
+		markPointPainter.Add(markPointRenderOption{
+			FillColor: seriesColor,
+			Font:      opt.Font,
+			Points:    points,
+			Series:    series,
+		})
+		markLinePainter.Add(markLineRenderOption{
+			FillColor:   seriesColor,
+			FontColor:   opt.Theme.GetTextColor(),
+			StrokeColor: seriesColor,
+			Font:        opt.Font,
+			Series:      series,
+			Range:       yRange,
+		})
+	}
+	// 最大、最小的mark point
+	err := doRender(rendererList...)
+	if err != nil {
+		return BoxZero, err
+	}
+
+	return p.box, nil
+}
+
+func (l *lineChart) Render() (Box, error) {
+	p := l.p
+	opt := l.opt
+
+	renderResult, err := defaultRender(p, defaultRenderOption{
+		Theme:              opt.Theme,
+		Padding:            opt.Padding,
+		SeriesList:         opt.SeriesList,
+		XAxis:              opt.XAxis,
+		YAxisOptions:       opt.YAxisOptions,
+		TitleOption:        opt.Title,
+		LegendOption:       opt.Legend,
+		backgroundIsFilled: opt.backgroundIsFilled,
+	})
+	if err != nil {
+		return BoxZero, err
+	}
+	seriesList := opt.SeriesList.Filter(ChartTypeLine)
+
+	return l.render(renderResult, seriesList)
+}

main.go

@@ -1,82 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"embed"
-	"encoding/base64"
-	"fmt"
-	"time"
-
-	"github.com/vicanso/elton"
-	"github.com/vicanso/elton/middleware"
-	"github.com/vicanso/go-charts/v2"
-)
-
-//go:embed web
-var webFS embed.FS
-
-func main() {
-	e := elton.New()
-
-	e.Use(middleware.NewLogger(middleware.LoggerConfig{
-		Format: `{real-ip} {when-iso} "{method} {uri} {proto}" {status} {size-human} "{userAgent}"`,
-		OnLog: func(s string, _ *elton.Context) {
-			fmt.Println(s)
-		},
-	}))
-	e.Use(middleware.NewDefaultError())
-	e.Use(middleware.NewDefaultBodyParser())
-	e.Use(func(c *elton.Context) error {
-		c.NoCache()
-		return c.Next()
-	})
-
-	assetFS := middleware.NewEmbedStaticFS(webFS, "web")
-	e.GET("/static/*", middleware.NewStaticServe(assetFS, middleware.StaticServeConfig{
-		// 客户端缓存
-		MaxAge: 10 * time.Minute,
-		// 缓存服务器缓存
-		SMaxAge:             5 * time.Minute,
-		DenyQueryString:     true,
-		DisableLastModified: true,
-		EnableStrongETag:    true,
-	}))
-
-	e.GET("/ping", func(c *elton.Context) error {
-		c.BodyBuffer = bytes.NewBufferString("pong")
-		return nil
-	})
-
-	e.GET("/", func(c *elton.Context) error {
-		buf, err := webFS.ReadFile("web/index.html")
-		if err != nil {
-			return err
-		}
-		c.SetContentTypeByExt(".html")
-		c.BodyBuffer = bytes.NewBuffer(buf)
-		return nil
-	})
-	e.POST("/", func(c *elton.Context) error {
-		outputType := c.QueryParam("outputType")
-		fn := charts.RenderEChartsToSVG
-		isPNG := false
-		if outputType == "png" {
-			isPNG = true
-			fn = charts.RenderEChartsToPNG
-		}
-		buf, err := fn(string(c.RequestBody))
-		if err != nil {
-			return err
-		}
-		if isPNG {
-			buf = []byte(base64.StdEncoding.EncodeToString(buf))
-		}
-		c.BodyBuffer = bytes.NewBuffer(buf)
-		return nil
-	})
-
-	err := e.ListenAndServe(":7001")
-	if err != nil {
-		panic(err)
-	}
-}

mark_line.go

@@ -0,0 +1,113 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"github.com/golang/freetype/truetype"
+)
+
+// NewMarkLine returns a series mark line
+func NewMarkLine(markLineTypes ...string) SeriesMarkLine {
+	data := make([]SeriesMarkData, len(markLineTypes))
+	for index, t := range markLineTypes {
+		data[index] = SeriesMarkData{
+			Type: t,
+		}
+	}
+	return SeriesMarkLine{
+		Data: data,
+	}
+}
+
+type markLinePainter struct {
+	p       *Painter
+	options []markLineRenderOption
+}
+
+func (m *markLinePainter) Add(opt markLineRenderOption) {
+	m.options = append(m.options, opt)
+}
+
+// NewMarkLinePainter returns a mark line renderer
+func NewMarkLinePainter(p *Painter) *markLinePainter {
+	return &markLinePainter{
+		p:       p,
+		options: make([]markLineRenderOption, 0),
+	}
+}
+
+type markLineRenderOption struct {
+	FillColor   Color
+	FontColor   Color
+	StrokeColor Color
+	Font        *truetype.Font
+	Series      Series
+	Range       axisRange
+}
+
+func (m *markLinePainter) Render() (Box, error) {
+	painter := m.p
+	for _, opt := range m.options {
+		s := opt.Series
+		if len(s.MarkLine.Data) == 0 {
+			continue
+		}
+		font := opt.Font
+		if font == nil {
+			font, _ = GetDefaultFont()
+		}
+		summary := s.Summary()
+		for _, markLine := range s.MarkLine.Data {
+			// 由于mark line会修改style，因此每次重新设置
+			painter.OverrideDrawingStyle(Style{
+				FillColor:   opt.FillColor,
+				StrokeColor: opt.StrokeColor,
+				StrokeWidth: 1,
+				StrokeDashArray: []float64{
+					4,
+					2,
+				},
+			}).OverrideTextStyle(Style{
+				Font:      font,
+				FontColor: opt.FontColor,
+				FontSize:  labelFontSize,
+			})
+			value := float64(0)
+			switch markLine.Type {
+			case SeriesMarkDataTypeMax:
+				value = summary.MaxValue
+			case SeriesMarkDataTypeMin:
+				value = summary.MinValue
+			default:
+				value = summary.AverageValue
+			}
+			y := opt.Range.getRestHeight(value)
+			width := painter.Width()
+			text := commafWithDigits(value)
+			textBox := painter.MeasureText(text)
+			painter.MarkLine(0, y, width-2)
+			painter.Text(text, width, y+textBox.Height()>>1-2)
+		}
+	}
+	return BoxZero, nil
+}

mark_line_test.go

@@ -0,0 +1,90 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+func TestMarkLine(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		render func(*Painter) ([]byte, error)
+		result string
+	}{
+		{
+			render: func(p *Painter) ([]byte, error) {
+				markLine := NewMarkLinePainter(p)
+				series := NewSeriesFromValues([]float64{
+					1,
+					2,
+					3,
+				})
+				series.MarkLine = NewMarkLine(
+					SeriesMarkDataTypeMax,
+					SeriesMarkDataTypeAverage,
+					SeriesMarkDataTypeMin,
+				)
+				markLine.Add(markLineRenderOption{
+					FillColor:   drawing.ColorBlack,
+					FontColor:   drawing.ColorBlack,
+					StrokeColor: drawing.ColorBlack,
+					Series:      series,
+					Range: NewRange(AxisRangeOption{
+						Painter:     p,
+						Min:         0,
+						Max:         5,
+						Size:        p.Height(),
+						DivideCount: 6,
+					}),
+				})
+				_, err := markLine.Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<circle cx=\"23\" cy=\"272\" r=\"3\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"M 29 272\nL 562 272\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"M 562 267\nL 578 272\nL 562 277\nL 567 272\nL 562 267\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><text x=\"580\" y=\"276\" style=\"stroke-width:0;stroke:none;fill:rgba(0,0,0,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">3</text><circle cx=\"23\" cy=\"308\" r=\"3\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"M 29 308\nL 562 308\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"M 562 303\nL 578 308\nL 562 313\nL 567 308\nL 562 303\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><text x=\"580\" y=\"312\" style=\"stroke-width:0;stroke:none;fill:rgba(0,0,0,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">2</text><circle cx=\"23\" cy=\"344\" r=\"3\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"M 29 344\nL 562 344\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"M 562 339\nL 578 344\nL 562 349\nL 567 344\nL 562 339\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,0,1.0)\"/><text x=\"580\" y=\"348\" style=\"stroke-width:0;stroke:none;fill:rgba(0,0,0,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">1</text></svg>",
+		},
+	}
+	for _, tt := range tests {
+		p, err := NewPainter(PainterOptions{
+			Type:   ChartOutputSVG,
+			Width:  600,
+			Height: 400,
+		}, PainterThemeOption(defaultTheme))
+		assert.Nil(err)
+		data, err := tt.render(p.Child(PainterPaddingOption(Box{
+			Left:   20,
+			Top:    20,
+			Right:  20,
+			Bottom: 20,
+		})))
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}

mark_point.go

@@ -0,0 +1,115 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"github.com/golang/freetype/truetype"
+)
+
+// NewMarkPoint returns a series mark point
+func NewMarkPoint(markPointTypes ...string) SeriesMarkPoint {
+	data := make([]SeriesMarkData, len(markPointTypes))
+	for index, t := range markPointTypes {
+		data[index] = SeriesMarkData{
+			Type: t,
+		}
+	}
+	return SeriesMarkPoint{
+		Data: data,
+	}
+}
+
+type markPointPainter struct {
+	p       *Painter
+	options []markPointRenderOption
+}
+
+func (m *markPointPainter) Add(opt markPointRenderOption) {
+	m.options = append(m.options, opt)
+}
+
+type markPointRenderOption struct {
+	FillColor Color
+	Font      *truetype.Font
+	Series    Series
+	Points    []Point
+}
+
+// NewMarkPointPainter returns a mark point renderer
+func NewMarkPointPainter(p *Painter) *markPointPainter {
+	return &markPointPainter{
+		p:       p,
+		options: make([]markPointRenderOption, 0),
+	}
+}
+
+func (m *markPointPainter) Render() (Box, error) {
+	painter := m.p
+	for _, opt := range m.options {
+		s := opt.Series
+		if len(s.MarkPoint.Data) == 0 {
+			continue
+		}
+		points := opt.Points
+		summary := s.Summary()
+		symbolSize := s.MarkPoint.SymbolSize
+		if symbolSize == 0 {
+			symbolSize = 30
+		}
+		textStyle := Style{
+			FontSize:    labelFontSize,
+			StrokeWidth: 1,
+			Font:        opt.Font,
+		}
+		if isLightColor(opt.FillColor) {
+			textStyle.FontColor = defaultLightFontColor
+		} else {
+			textStyle.FontColor = defaultDarkFontColor
+		}
+		painter.OverrideDrawingStyle(Style{
+			FillColor: opt.FillColor,
+		}).OverrideTextStyle(textStyle)
+		for _, markPointData := range s.MarkPoint.Data {
+			textStyle.FontSize = labelFontSize
+			painter.OverrideTextStyle(textStyle)
+			p := points[summary.MinIndex]
+			value := summary.MinValue
+			switch markPointData.Type {
+			case SeriesMarkDataTypeMax:
+				p = points[summary.MaxIndex]
+				value = summary.MaxValue
+			}
+
+			painter.Pin(p.X, p.Y-symbolSize>>1, symbolSize)
+			text := commafWithDigits(value)
+			textBox := painter.MeasureText(text)
+			if textBox.Width() > symbolSize {
+				textStyle.FontSize = smallLabelFontSize
+				painter.OverrideTextStyle(textStyle)
+				textBox = painter.MeasureText(text)
+			}
+			painter.Text(text, p.X-textBox.Width()>>1, p.Y-symbolSize>>1-2)
+		}
+	}
+	return BoxZero, nil
+}

mark_point_test.go

@@ -0,0 +1,92 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+func TestMarkPoint(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		render func(*Painter) ([]byte, error)
+		result string
+	}{
+		{
+			render: func(p *Painter) ([]byte, error) {
+				series := NewSeriesFromValues([]float64{
+					1,
+					2,
+					3,
+				})
+				series.MarkPoint = NewMarkPoint(SeriesMarkDataTypeMax)
+				markPoint := NewMarkPointPainter(p)
+				markPoint.Add(markPointRenderOption{
+					FillColor: drawing.ColorBlack,
+					Series:    series,
+					Points: []Point{
+						{
+							X: 10,
+							Y: 10,
+						},
+						{
+							X: 30,
+							Y: 30,
+						},
+						{
+							X: 50,
+							Y: 50,
+						},
+					},
+				})
+				_, err := markPoint.Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 67 62\nA 15 15 330.00 1 1 73 62\nL 70 48\nZ\" style=\"stroke-width:0;stroke:none;fill:rgba(0,0,0,1.0)\"/><path  d=\"M 55 48\nQ70,85 85,48\nZ\" style=\"stroke-width:0;stroke:none;fill:rgba(0,0,0,1.0)\"/><text x=\"66\" y=\"53\" style=\"stroke-width:0;stroke:none;fill:rgba(238,238,238,1.0);font-size:12.8px;font-family:'Roboto Medium',sans-serif\">3</text></svg>",
+		},
+	}
+
+	for _, tt := range tests {
+		p, err := NewPainter(PainterOptions{
+			Type:   ChartOutputSVG,
+			Width:  600,
+			Height: 400,
+		}, PainterThemeOption(defaultTheme))
+		assert.Nil(err)
+		data, err := tt.render(p.Child(PainterPaddingOption(Box{
+			Left:   20,
+			Top:    20,
+			Right:  20,
+			Bottom: 20,
+		})))
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}

painter.go

@@ -0,0 +1,866 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"bytes"
+	"errors"
+	"math"
+
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+type ValueFormatter func(float64) string
+
+type Painter struct {
+	render chart.Renderer
+	box    Box
+	font   *truetype.Font
+	parent *Painter
+	style  Style
+	theme  ColorPalette
+	// 类型
+	outputType     string
+	valueFormatter ValueFormatter
+}
+
+type PainterOptions struct {
+	// Draw type, "svg" or "png", default type is "png"
+	Type string
+	// The width of draw painter
+	Width int
+	// The height of draw painter
+	Height int
+	// The font for painter
+	Font *truetype.Font
+}
+
+type PainterOption func(*Painter)
+
+type TicksOption struct {
+	// the first tick
+	First  int
+	Length int
+	Orient string
+	Count  int
+	Unit   int
+}
+
+type MultiTextOption struct {
+	TextList []string
+	Orient   string
+	Unit     int
+	Position string
+	Align    string
+	// The text rotation of label
+	TextRotation float64
+	Offset       Box
+	// The first text index
+	First int
+}
+
+type GridOption struct {
+	Column      int
+	Row         int
+	ColumnSpans []int
+	// 忽略不展示的column
+	IgnoreColumnLines []int
+	// 忽略不展示的row
+	IgnoreRowLines []int
+}
+
+// PainterPaddingOption sets the padding of draw painter
+func PainterPaddingOption(padding Box) PainterOption {
+	return func(p *Painter) {
+		p.box.Left += padding.Left
+		p.box.Top += padding.Top
+		p.box.Right -= padding.Right
+		p.box.Bottom -= padding.Bottom
+	}
+}
+
+// PainterBoxOption sets the box of draw painter
+func PainterBoxOption(box Box) PainterOption {
+	return func(p *Painter) {
+		if box.IsZero() {
+			return
+		}
+		p.box = box
+	}
+}
+
+// PainterFontOption sets the font of draw painter
+func PainterFontOption(font *truetype.Font) PainterOption {
+	return func(p *Painter) {
+		if font == nil {
+			return
+		}
+		p.font = font
+	}
+}
+
+// PainterStyleOption sets the style of draw painter
+func PainterStyleOption(style Style) PainterOption {
+	return func(p *Painter) {
+		p.SetStyle(style)
+	}
+}
+
+// PainterThemeOption sets the theme of draw painter
+func PainterThemeOption(theme ColorPalette) PainterOption {
+	return func(p *Painter) {
+		if theme == nil {
+			return
+		}
+		p.theme = theme
+	}
+}
+
+// PainterWidthHeightOption set width or height of draw painter
+func PainterWidthHeightOption(width, height int) PainterOption {
+	return func(p *Painter) {
+		if width > 0 {
+			p.box.Right = p.box.Left + width
+		}
+		if height > 0 {
+			p.box.Bottom = p.box.Top + height
+		}
+	}
+}
+
+// NewPainter creates a painter
+func NewPainter(opts PainterOptions, opt ...PainterOption) (*Painter, error) {
+	if opts.Width <= 0 || opts.Height <= 0 {
+		return nil, errors.New("width/height can not be nil")
+	}
+	font := opts.Font
+	if font == nil {
+		f, err := GetDefaultFont()
+		if err != nil {
+			return nil, err
+		}
+		font = f
+	}
+	fn := chart.PNG
+	if opts.Type == ChartOutputSVG {
+		fn = chart.SVG
+	}
+	width := opts.Width
+	height := opts.Height
+	r, err := fn(width, height)
+	if err != nil {
+		return nil, err
+	}
+	r.SetFont(font)
+
+	p := &Painter{
+		render: r,
+		box: Box{
+			Right:  opts.Width,
+			Bottom: opts.Height,
+		},
+		font: font,
+		// 类型
+		outputType: opts.Type,
+	}
+	p.setOptions(opt...)
+	if p.theme == nil {
+		p.theme = NewTheme(ThemeLight)
+	}
+	return p, nil
+}
+func (p *Painter) setOptions(opts ...PainterOption) {
+	for _, fn := range opts {
+		fn(p)
+	}
+}
+
+func (p *Painter) Child(opt ...PainterOption) *Painter {
+	child := &Painter{
+		// 格式化
+		valueFormatter: p.valueFormatter,
+		// render
+		render: p.render,
+		box:    p.box.Clone(),
+		font:   p.font,
+		parent: p,
+		style:  p.style,
+		theme:  p.theme,
+	}
+	child.setOptions(opt...)
+	return child
+}
+
+func (p *Painter) SetStyle(style Style) {
+	if style.Font == nil {
+		style.Font = p.font
+	}
+	p.style = style
+	style.WriteToRenderer(p.render)
+}
+
+func overrideStyle(defaultStyle Style, style Style) Style {
+	if style.StrokeWidth == 0 {
+		style.StrokeWidth = defaultStyle.StrokeWidth
+	}
+	if style.StrokeColor.IsZero() {
+		style.StrokeColor = defaultStyle.StrokeColor
+	}
+	if style.StrokeDashArray == nil {
+		style.StrokeDashArray = defaultStyle.StrokeDashArray
+	}
+	if style.DotColor.IsZero() {
+		style.DotColor = defaultStyle.DotColor
+	}
+	if style.DotWidth == 0 {
+		style.DotWidth = defaultStyle.DotWidth
+	}
+	if style.FillColor.IsZero() {
+		style.FillColor = defaultStyle.FillColor
+	}
+	if style.FontSize == 0 {
+		style.FontSize = defaultStyle.FontSize
+	}
+	if style.FontColor.IsZero() {
+		style.FontColor = defaultStyle.FontColor
+	}
+	if style.Font == nil {
+		style.Font = defaultStyle.Font
+	}
+	return style
+}
+
+func (p *Painter) OverrideDrawingStyle(style Style) *Painter {
+	s := overrideStyle(p.style, style)
+	p.SetDrawingStyle(s)
+	return p
+}
+
+func (p *Painter) SetDrawingStyle(style Style) *Painter {
+	style.WriteDrawingOptionsToRenderer(p.render)
+	return p
+}
+
+func (p *Painter) SetTextStyle(style Style) *Painter {
+	if style.Font == nil {
+		style.Font = p.font
+	}
+	style.WriteTextOptionsToRenderer(p.render)
+	return p
+}
+func (p *Painter) OverrideTextStyle(style Style) *Painter {
+	s := overrideStyle(p.style, style)
+	p.SetTextStyle(s)
+	return p
+}
+
+func (p *Painter) ResetStyle() *Painter {
+	p.style.WriteToRenderer(p.render)
+	return p
+}
+
+// Bytes returns the data of draw canvas
+func (p *Painter) Bytes() ([]byte, error) {
+	buffer := bytes.Buffer{}
+	err := p.render.Save(&buffer)
+	if err != nil {
+		return nil, err
+	}
+	return buffer.Bytes(), err
+}
+
+// MoveTo moves the cursor to a given point
+func (p *Painter) MoveTo(x, y int) *Painter {
+	p.render.MoveTo(x+p.box.Left, y+p.box.Top)
+	return p
+}
+
+func (p *Painter) ArcTo(cx, cy int, rx, ry, startAngle, delta float64) *Painter {
+	p.render.ArcTo(cx+p.box.Left, cy+p.box.Top, rx, ry, startAngle, delta)
+	return p
+}
+
+func (p *Painter) LineTo(x, y int) *Painter {
+	p.render.LineTo(x+p.box.Left, y+p.box.Top)
+	return p
+}
+
+func (p *Painter) QuadCurveTo(cx, cy, x, y int) *Painter {
+	p.render.QuadCurveTo(cx+p.box.Left, cy+p.box.Top, x+p.box.Left, y+p.box.Top)
+	return p
+}
+
+func (p *Painter) Pin(x, y, width int) *Painter {
+	r := float64(width) / 2
+	y -= width / 4
+	angle := chart.DegreesToRadians(15)
+	box := p.box
+
+	startAngle := math.Pi/2 + angle
+	delta := 2*math.Pi - 2*angle
+	p.ArcTo(x, y, r, r, startAngle, delta)
+	p.LineTo(x, y)
+	p.Close()
+	p.FillStroke()
+
+	startX := x - int(r)
+	startY := y
+	endX := x + int(r)
+	endY := y
+	p.MoveTo(startX, startY)
+
+	left := box.Left
+	top := box.Top
+	cx := x
+	cy := y + int(r*2.5)
+	p.render.QuadCurveTo(cx+left, cy+top, endX+left, endY+top)
+	p.Close()
+	p.Fill()
+	return p
+}
+
+func (p *Painter) arrow(x, y, width, height int, direction string) *Painter {
+	halfWidth := width >> 1
+	halfHeight := height >> 1
+	if direction == PositionTop || direction == PositionBottom {
+		x0 := x - halfWidth
+		x1 := x0 + width
+		dy := -height / 3
+		y0 := y
+		y1 := y0 - height
+		if direction == PositionBottom {
+			y0 = y - height
+			y1 = y
+			dy = 2 * dy
+		}
+		p.MoveTo(x0, y0)
+		p.LineTo(x0+halfWidth, y1)
+		p.LineTo(x1, y0)
+		p.LineTo(x0+halfWidth, y+dy)
+		p.LineTo(x0, y0)
+	} else {
+		x0 := x + width
+		x1 := x0 - width
+		y0 := y - halfHeight
+		dx := -width / 3
+		if direction == PositionRight {
+			x0 = x - width
+			dx = -dx
+			x1 = x0 + width
+		}
+		p.MoveTo(x0, y0)
+		p.LineTo(x1, y0+halfHeight)
+		p.LineTo(x0, y0+height)
+		p.LineTo(x0+dx, y0+halfHeight)
+		p.LineTo(x0, y0)
+	}
+	p.FillStroke()
+	return p
+}
+
+func (p *Painter) ArrowLeft(x, y, width, height int) *Painter {
+	p.arrow(x, y, width, height, PositionLeft)
+	return p
+}
+
+func (p *Painter) ArrowRight(x, y, width, height int) *Painter {
+	p.arrow(x, y, width, height, PositionRight)
+	return p
+}
+
+func (p *Painter) ArrowTop(x, y, width, height int) *Painter {
+	p.arrow(x, y, width, height, PositionTop)
+	return p
+}
+func (p *Painter) ArrowBottom(x, y, width, height int) *Painter {
+	p.arrow(x, y, width, height, PositionBottom)
+	return p
+}
+
+func (p *Painter) Circle(radius float64, x, y int) *Painter {
+	p.render.Circle(radius, x+p.box.Left, y+p.box.Top)
+	return p
+}
+
+func (p *Painter) Stroke() *Painter {
+	p.render.Stroke()
+	return p
+}
+
+func (p *Painter) Close() *Painter {
+	p.render.Close()
+	return p
+}
+
+func (p *Painter) FillStroke() *Painter {
+	p.render.FillStroke()
+	return p
+}
+
+func (p *Painter) Fill() *Painter {
+	p.render.Fill()
+	return p
+}
+
+func (p *Painter) Width() int {
+	return p.box.Width()
+}
+
+func (p *Painter) Height() int {
+	return p.box.Height()
+}
+
+func (p *Painter) MeasureText(text string) Box {
+	return p.render.MeasureText(text)
+}
+
+func (p *Painter) MeasureTextMaxWidthHeight(textList []string) (int, int) {
+	maxWidth := 0
+	maxHeight := 0
+	for _, text := range textList {
+		box := p.MeasureText(text)
+		if maxWidth < box.Width() {
+			maxWidth = box.Width()
+		}
+		if maxHeight < box.Height() {
+			maxHeight = box.Height()
+		}
+	}
+	return maxWidth, maxHeight
+}
+
+func (p *Painter) LineStroke(points []Point) *Painter {
+	shouldMoveTo := false
+	for index, point := range points {
+		x := point.X
+		y := point.Y
+		if y == int(math.MaxInt32) {
+			p.Stroke()
+			shouldMoveTo = true
+			continue
+		}
+		if shouldMoveTo || index == 0 {
+			p.MoveTo(x, y)
+			shouldMoveTo = false
+		} else {
+			p.LineTo(x, y)
+		}
+	}
+	p.Stroke()
+	return p
+}
+
+func (p *Painter) SmoothLineStroke(points []Point) *Painter {
+	prevX := 0
+	prevY := 0
+	// TODO 如何生成平滑的折线
+	for index, point := range points {
+		x := point.X
+		y := point.Y
+		if index == 0 {
+			p.MoveTo(x, y)
+		} else {
+			cx := prevX + (x-prevX)/5
+			cy := y + (y-prevY)/2
+			p.QuadCurveTo(cx, cy, x, y)
+		}
+		prevX = x
+		prevY = y
+	}
+	p.Stroke()
+	return p
+}
+
+func (p *Painter) SetBackground(width, height int, color Color, inside ...bool) *Painter {
+	r := p.render
+	s := chart.Style{
+		FillColor: color,
+	}
+	// 背景色
+	p.SetDrawingStyle(s)
+	defer p.ResetStyle()
+	if len(inside) != 0 && inside[0] {
+		p.MoveTo(0, 0)
+		p.LineTo(width, 0)
+		p.LineTo(width, height)
+		p.LineTo(0, height)
+		p.LineTo(0, 0)
+	} else {
+		// 设置背景色不使用box，因此不直接使用Painter
+		r.MoveTo(0, 0)
+		r.LineTo(width, 0)
+		r.LineTo(width, height)
+		r.LineTo(0, height)
+		r.LineTo(0, 0)
+	}
+	p.FillStroke()
+	return p
+}
+func (p *Painter) MarkLine(x, y, width int) *Painter {
+	arrowWidth := 16
+	arrowHeight := 10
+	endX := x + width
+	radius := 3
+	p.Circle(3, x+radius, y)
+	p.render.Fill()
+	p.MoveTo(x+radius*3, y)
+	p.LineTo(endX-arrowWidth, y)
+	p.Stroke()
+	p.ArrowRight(endX, y, arrowWidth, arrowHeight)
+	return p
+}
+
+func (p *Painter) Polygon(center Point, radius float64, sides int) *Painter {
+	points := getPolygonPoints(center, radius, sides)
+	for i, item := range points {
+		if i == 0 {
+			p.MoveTo(item.X, item.Y)
+		} else {
+			p.LineTo(item.X, item.Y)
+		}
+	}
+	p.LineTo(points[0].X, points[0].Y)
+	p.Stroke()
+	return p
+}
+
+func (p *Painter) FillArea(points []Point) *Painter {
+	var x, y int
+	for index, point := range points {
+		x = point.X
+		y = point.Y
+		if index == 0 {
+			p.MoveTo(x, y)
+		} else {
+			p.LineTo(x, y)
+		}
+	}
+	p.Fill()
+	return p
+}
+
+func (p *Painter) Text(body string, x, y int) *Painter {
+	p.render.Text(body, x+p.box.Left, y+p.box.Top)
+	return p
+}
+
+func (p *Painter) TextRotation(body string, x, y int, radians float64) {
+	p.render.SetTextRotation(radians)
+	p.render.Text(body, x+p.box.Left, y+p.box.Top)
+	p.render.ClearTextRotation()
+}
+
+func (p *Painter) SetTextRotation(radians float64) {
+	p.render.SetTextRotation(radians)
+}
+func (p *Painter) ClearTextRotation() {
+	p.render.ClearTextRotation()
+}
+
+func (p *Painter) TextFit(body string, x, y, width int, textAligns ...string) chart.Box {
+	style := p.style
+	textWarp := style.TextWrap
+	style.TextWrap = chart.TextWrapWord
+	r := p.render
+	lines := chart.Text.WrapFit(r, body, width, style)
+	p.SetTextStyle(style)
+	var output chart.Box
+
+	textAlign := ""
+	if len(textAligns) != 0 {
+		textAlign = textAligns[0]
+	}
+	for index, line := range lines {
+		if line == "" {
+			continue
+		}
+		x0 := x
+		y0 := y + output.Height()
+		lineBox := r.MeasureText(line)
+		switch textAlign {
+		case AlignRight:
+			x0 += width - lineBox.Width()
+		case AlignCenter:
+			x0 += (width - lineBox.Width()) >> 1
+		}
+		p.Text(line, x0, y0)
+		output.Right = chart.MaxInt(lineBox.Right, output.Right)
+		output.Bottom += lineBox.Height()
+		if index < len(lines)-1 {
+			output.Bottom += +style.GetTextLineSpacing()
+		}
+	}
+	p.style.TextWrap = textWarp
+	return output
+}
+
+func (p *Painter) Ticks(opt TicksOption) *Painter {
+	if opt.Count <= 0 || opt.Length <= 0 {
+		return p
+	}
+	count := opt.Count
+	first := opt.First
+	width := p.Width()
+	height := p.Height()
+	unit := 1
+	if opt.Unit > 1 {
+		unit = opt.Unit
+	}
+	var values []int
+	isVertical := opt.Orient == OrientVertical
+	if isVertical {
+		values = autoDivide(height, count)
+	} else {
+		values = autoDivide(width, count)
+	}
+	for index, value := range values {
+		if index < first {
+			continue
+		}
+		if (index-first)%unit != 0 {
+			continue
+		}
+		if isVertical {
+			p.LineStroke([]Point{
+				{
+					X: 0,
+					Y: value,
+				},
+				{
+					X: opt.Length,
+					Y: value,
+				},
+			})
+		} else {
+			p.LineStroke([]Point{
+				{
+					X: value,
+					Y: opt.Length,
+				},
+				{
+					X: value,
+					Y: 0,
+				},
+			})
+		}
+	}
+	return p
+}
+
+func (p *Painter) MultiText(opt MultiTextOption) *Painter {
+	if len(opt.TextList) == 0 {
+		return p
+	}
+	count := len(opt.TextList)
+	positionCenter := true
+	showIndex := opt.Unit / 2
+	if containsString([]string{
+		PositionLeft,
+		PositionTop,
+	}, opt.Position) {
+		positionCenter = false
+		count--
+		// 非居中
+		showIndex = 0
+	}
+	width := p.Width()
+	height := p.Height()
+	var values []int
+	isVertical := opt.Orient == OrientVertical
+	if isVertical {
+		values = autoDivide(height, count)
+	} else {
+		values = autoDivide(width, count)
+	}
+	isTextRotation := opt.TextRotation != 0
+	offset := opt.Offset
+	for index, text := range opt.TextList {
+		if index < opt.First {
+			continue
+		}
+		if opt.Unit != 0 && (index-opt.First)%opt.Unit != showIndex {
+			continue
+		}
+		if isTextRotation {
+			p.ClearTextRotation()
+			p.SetTextRotation(opt.TextRotation)
+		}
+		box := p.MeasureText(text)
+		start := values[index]
+		if positionCenter {
+			start = (values[index] + values[index+1]) >> 1
+		}
+		x := 0
+		y := 0
+		if isVertical {
+			y = start + box.Height()>>1
+			switch opt.Align {
+			case AlignRight:
+				x = width - box.Width()
+			case AlignCenter:
+				x = width - box.Width()>>1
+			default:
+				x = 0
+			}
+		} else {
+			x = start - box.Width()>>1
+		}
+		x += offset.Left
+		y += offset.Top
+		p.Text(text, x, y)
+	}
+	if isTextRotation {
+		p.ClearTextRotation()
+	}
+	return p
+}
+
+func (p *Painter) Grid(opt GridOption) *Painter {
+	width := p.Width()
+	height := p.Height()
+	drawLines := func(values []int, ignoreIndexList []int, isVertical bool) {
+		for index, v := range values {
+			if containsInt(ignoreIndexList, index) {
+				continue
+			}
+			x0 := 0
+			y0 := 0
+			x1 := 0
+			y1 := 0
+			if isVertical {
+
+				x0 = v
+				x1 = v
+				y1 = height
+			} else {
+				x1 = width
+				y0 = v
+				y1 = v
+			}
+			p.LineStroke([]Point{
+				{
+					X: x0,
+					Y: y0,
+				},
+				{
+					X: x1,
+					Y: y1,
+				},
+			})
+		}
+	}
+	columnCount := sumInt(opt.ColumnSpans)
+	if columnCount == 0 {
+		columnCount = opt.Column
+	}
+	if columnCount > 0 {
+		values := autoDivideSpans(width, columnCount, opt.ColumnSpans)
+		drawLines(values, opt.IgnoreColumnLines, true)
+	}
+	if opt.Row > 0 {
+		values := autoDivide(height, opt.Row)
+		drawLines(values, opt.IgnoreRowLines, false)
+	}
+	return p
+}
+
+func (p *Painter) Dots(points []Point) *Painter {
+	for _, item := range points {
+		p.Circle(2, item.X, item.Y)
+	}
+	p.FillStroke()
+	return p
+}
+
+func (p *Painter) Rect(box Box) *Painter {
+	p.MoveTo(box.Left, box.Top)
+	p.LineTo(box.Right, box.Top)
+	p.LineTo(box.Right, box.Bottom)
+	p.LineTo(box.Left, box.Bottom)
+	p.LineTo(box.Left, box.Top)
+	p.FillStroke()
+	return p
+}
+
+func (p *Painter) RoundedRect(box Box, radius int) *Painter {
+	r := (box.Right - box.Left) / 2
+	if radius > r {
+		radius = r
+	}
+	rx := float64(radius)
+	ry := float64(radius)
+	p.MoveTo(box.Left+radius, box.Top)
+	p.LineTo(box.Right-radius, box.Top)
+
+	cx := box.Right - radius
+	cy := box.Top + radius
+	// right top
+	p.ArcTo(cx, cy, rx, ry, -math.Pi/2, math.Pi/2)
+
+	p.LineTo(box.Right, box.Bottom-radius)
+
+	// right bottom
+	cx = box.Right - radius
+	cy = box.Bottom - radius
+	p.ArcTo(cx, cy, rx, ry, 0.0, math.Pi/2)
+
+	p.LineTo(box.Left+radius, box.Bottom)
+
+	// left bottom
+	cx = box.Left + radius
+	cy = box.Bottom - radius
+	p.ArcTo(cx, cy, rx, ry, math.Pi/2, math.Pi/2)
+
+	p.LineTo(box.Left, box.Top+radius)
+
+	// left top
+	cx = box.Left + radius
+	cy = box.Top + radius
+	p.ArcTo(cx, cy, rx, ry, math.Pi, math.Pi/2)
+
+	p.Close()
+	p.FillStroke()
+	p.Fill()
+	return p
+}
+
+func (p *Painter) LegendLineDot(box Box) *Painter {
+	width := box.Width()
+	height := box.Height()
+	strokeWidth := 3
+	dotHeight := 5
+
+	p.render.SetStrokeWidth(float64(strokeWidth))
+	center := (height-strokeWidth)>>1 - 1
+	p.MoveTo(box.Left, box.Top-center)
+	p.LineTo(box.Right, box.Top-center)
+	p.Stroke()
+	p.Circle(float64(dotHeight), box.Left+width>>1, box.Top-center)
+	p.FillStroke()
+	return p
+}
+
+func (p *Painter) GetRenderer() chart.Renderer {
+	return p.render
+}

painter_test.go

@@ -0,0 +1,399 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"math"
+	"testing"
+
+	"github.com/golang/freetype/truetype"
+	"github.com/stretchr/testify/assert"
+	"git.smarteching.com/zeni/go-chart/v2"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+func TestPainterOption(t *testing.T) {
+	assert := assert.New(t)
+
+	font := &truetype.Font{}
+	d, err := NewPainter(PainterOptions{
+		Width:  800,
+		Height: 600,
+		Type:   ChartOutputSVG,
+	},
+		PainterBoxOption(Box{
+			Right:  400,
+			Bottom: 300,
+		}),
+		PainterPaddingOption(Box{
+			Left:   1,
+			Top:    2,
+			Right:  3,
+			Bottom: 4,
+		}),
+		PainterFontOption(font),
+		PainterStyleOption(Style{
+			ClassName: "test",
+		}),
+	)
+	assert.Nil(err)
+	assert.Equal(Box{
+		Left:   1,
+		Top:    2,
+		Right:  397,
+		Bottom: 296,
+	}, d.box)
+	assert.Equal(font, d.font)
+	assert.Equal("test", d.style.ClassName)
+}
+
+func TestPainter(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		fn     func(*Painter)
+		result string
+	}{
+		// moveTo, lineTo
+		{
+			fn: func(p *Painter) {
+				p.MoveTo(1, 1)
+				p.LineTo(2, 2)
+				p.Stroke()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 6 11\nL 7 12\" style=\"stroke-width:0;stroke:none;fill:none\"/></svg>",
+		},
+		// circle
+		{
+			fn: func(p *Painter) {
+				p.Circle(5, 2, 3)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<circle cx=\"7\" cy=\"13\" r=\"5\" style=\"stroke-width:0;stroke:none;fill:none\"/></svg>",
+		},
+		// text
+		{
+			fn: func(p *Painter) {
+				p.Text("hello world!", 3, 6)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<text x=\"8\" y=\"16\" style=\"stroke-width:0;stroke:none;fill:none;font-family:'Roboto Medium',sans-serif\">hello world!</text></svg>",
+		},
+		// line stroke
+		{
+			fn: func(p *Painter) {
+				p.SetDrawingStyle(Style{
+					StrokeColor: drawing.ColorBlack,
+					StrokeWidth: 1,
+				})
+				p.LineStroke([]Point{
+					{
+						X: 1,
+						Y: 2,
+					},
+					{
+						X: 3,
+						Y: 4,
+					},
+				})
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 6 12\nL 8 14\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:none\"/></svg>",
+		},
+		// set background
+		{
+			fn: func(p *Painter) {
+				p.SetBackground(400, 300, chart.ColorWhite)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 0 0\nL 400 0\nL 400 300\nL 0 300\nL 0 0\" style=\"stroke-width:0;stroke:none;fill:rgba(255,255,255,1.0)\"/></svg>",
+		},
+		// arcTo
+		{
+			fn: func(p *Painter) {
+				p.SetStyle(Style{
+					StrokeWidth: 1,
+					StrokeColor: drawing.ColorBlack,
+					FillColor:   drawing.ColorBlue,
+				})
+				p.ArcTo(100, 100, 100, 100, 0, math.Pi/2)
+				p.Close()
+				p.FillStroke()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 205 110\nA 100 100 90.00 0 1 105 210\nZ\" style=\"stroke-width:1;stroke:rgba(0,0,0,1.0);fill:rgba(0,0,255,1.0)\"/></svg>",
+		},
+		// pin
+		{
+			fn: func(p *Painter) {
+				p.SetStyle(Style{
+					StrokeWidth: 1,
+					StrokeColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+					FillColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+				})
+				p.Pin(30, 30, 30)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 32 47\nA 15 15 330.00 1 1 38 47\nL 35 33\nZ\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><path  d=\"M 20 33\nQ35,70 50,33\nZ\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/></svg>",
+		},
+		// arrow left
+		{
+			fn: func(p *Painter) {
+				p.SetStyle(Style{
+					StrokeWidth: 1,
+					StrokeColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+					FillColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+				})
+				p.ArrowLeft(30, 30, 16, 10)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 51 35\nL 35 40\nL 51 45\nL 46 40\nL 51 35\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/></svg>",
+		},
+		// arrow right
+		{
+			fn: func(p *Painter) {
+				p.SetStyle(Style{
+					StrokeWidth: 1,
+					StrokeColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+					FillColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+				})
+				p.ArrowRight(30, 30, 16, 10)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 19 35\nL 35 40\nL 19 45\nL 24 40\nL 19 35\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/></svg>",
+		},
+		// arrow top
+		{
+			fn: func(p *Painter) {
+				p.SetStyle(Style{
+					StrokeWidth: 1,
+					StrokeColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+					FillColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+				})
+				p.ArrowTop(30, 30, 10, 16)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 30 40\nL 35 24\nL 40 40\nL 35 35\nL 30 40\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/></svg>",
+		},
+		// arrow bottom
+		{
+			fn: func(p *Painter) {
+				p.SetStyle(Style{
+					StrokeWidth: 1,
+					StrokeColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+					FillColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+				})
+				p.ArrowBottom(30, 30, 10, 16)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 30 24\nL 35 40\nL 40 24\nL 35 30\nL 30 24\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/></svg>",
+		},
+		// mark line
+		{
+			fn: func(p *Painter) {
+				p.SetStyle(Style{
+					StrokeWidth: 1,
+					StrokeColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+					FillColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+					StrokeDashArray: []float64{
+						4,
+						2,
+					},
+				})
+				p.MarkLine(0, 20, 300)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<circle cx=\"8\" cy=\"30\" r=\"3\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"M 14 30\nL 289 30\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/><path stroke-dasharray=\"4.0, 2.0\" d=\"M 289 25\nL 305 30\nL 289 35\nL 294 30\nL 289 25\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:rgba(84,112,198,1.0)\"/></svg>",
+		},
+		// polygon
+		{
+			fn: func(p *Painter) {
+				p.SetStyle(Style{
+					StrokeWidth: 1,
+					StrokeColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+				})
+				p.Polygon(Point{
+					X: 100,
+					Y: 100,
+				}, 50, 6)
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 105 60\nL 148 85\nL 148 134\nL 105 160\nL 62 135\nL 62 86\nL 105 60\" style=\"stroke-width:1;stroke:rgba(84,112,198,1.0);fill:none\"/></svg>",
+		},
+		// FillArea
+		{
+			fn: func(p *Painter) {
+				p.SetDrawingStyle(Style{
+					FillColor: Color{
+						R: 84,
+						G: 112,
+						B: 198,
+						A: 255,
+					},
+				})
+				p.FillArea([]Point{
+					{
+						X: 0,
+						Y: 0,
+					},
+					{
+						X: 0,
+						Y: 100,
+					},
+					{
+						X: 100,
+						Y: 100,
+					},
+					{
+						X: 0,
+						Y: 0,
+					},
+				})
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 5 10\nL 5 110\nL 105 110\nL 5 10\" style=\"stroke-width:0;stroke:none;fill:rgba(84,112,198,1.0)\"/></svg>",
+		},
+	}
+	for _, tt := range tests {
+		d, err := NewPainter(PainterOptions{
+			Width:  400,
+			Height: 300,
+			Type:   ChartOutputSVG,
+		}, PainterPaddingOption(chart.Box{
+			Left: 5,
+			Top:  10,
+		}))
+		assert.Nil(err)
+		tt.fn(d)
+		data, err := d.Bytes()
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}
+
+func TestRoundedRect(t *testing.T) {
+	assert := assert.New(t)
+	p, err := NewPainter(PainterOptions{
+		Width:  400,
+		Height: 300,
+		Type:   ChartOutputSVG,
+	})
+	assert.Nil(err)
+	p.OverrideDrawingStyle(Style{
+		FillColor:   drawing.ColorWhite,
+		StrokeWidth: 1,
+		StrokeColor: drawing.ColorWhite,
+	}).RoundedRect(Box{
+		Left:   10,
+		Right:  30,
+		Bottom: 150,
+		Top:    10,
+	}, 5)
+	buf, err := p.Bytes()
+	assert.Nil(err)
+	assert.Equal("<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"400\" height=\"300\">\\n<path  d=\"M 15 10\nL 25 10\nL 25 10\nA 5 5 90.00 0 1 30 15\nL 30 145\nL 30 145\nA 5 5 90.00 0 1 25 150\nL 15 150\nL 15 150\nA 5 5 90.00 0 1 10 145\nL 10 15\nL 10 15\nA 5 5 90.00 0 1 15 10\nZ\" style=\"stroke-width:1;stroke:rgba(255,255,255,1.0);fill:rgba(255,255,255,1.0)\"/><path  d=\"\" style=\"stroke-width:1;stroke:rgba(255,255,255,1.0);fill:rgba(255,255,255,1.0)\"/></svg>", string(buf))
+}
+
+func TestPainterTextFit(t *testing.T) {
+	assert := assert.New(t)
+	p, err := NewPainter(PainterOptions{
+		Width:  400,
+		Height: 300,
+		Type:   ChartOutputSVG,
+	})
+	assert.Nil(err)
+	f, _ := GetDefaultFont()
+	style := Style{
+		FontSize:  12,
+		FontColor: chart.ColorBlack,
+		Font:      f,
+	}
+	p.SetStyle(style)
+	box := p.TextFit("Hello World!", 0, 20, 80)
+	assert.Equal(chart.Box{
+		Right:  45,
+		Bottom: 35,
+	}, box)
+
+	box = p.TextFit("Hello World!", 0, 100, 200)
+	assert.Equal(chart.Box{
+		Right:  84,
+		Bottom: 15,
+	}, box)
+
+	buf, err := p.Bytes()
+	assert.Nil(err)
+	assert.Equal(`<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="400" height="300">\n<text x="0" y="20" style="stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif">Hello</text><text x="0" y="40" style="stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif">World!</text><text x="0" y="100" style="stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif">Hello World!</text></svg>`, string(buf))
+}

pie_chart.go

@@ -0,0 +1,318 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"errors"
+	"math"
+
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+type pieChart struct {
+	p   *Painter
+	opt *PieChartOption
+}
+
+type PieChartOption struct {
+	// The theme
+	Theme ColorPalette
+	// The font size
+	Font *truetype.Font
+	// The data series list
+	SeriesList SeriesList
+	// The padding of line chart
+	Padding Box
+	// The option of title
+	Title TitleOption
+	// The legend option
+	Legend LegendOption
+	// background is filled
+	backgroundIsFilled bool
+}
+
+// NewPieChart returns a pie chart renderer
+func NewPieChart(p *Painter, opt PieChartOption) *pieChart {
+	if opt.Theme == nil {
+		opt.Theme = defaultTheme
+	}
+	return &pieChart{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+type sector struct {
+	value       float64
+	percent     float64
+	cx          int
+	cy          int
+	rx          float64
+	ry          float64
+	start       float64
+	delta       float64
+	offset      int
+	quadrant    int
+	lineStartX  int
+	lineStartY  int
+	lineBranchX int
+	lineBranchY int
+	lineEndX    int
+	lineEndY    int
+	showLabel   bool
+	label       string
+	series      Series
+	color       Color
+}
+
+func NewSector(cx int, cy int, radius float64, labelRadius float64, value float64, currentValue float64, totalValue float64, labelLineLength int, label string, series Series, color Color) sector {
+	s := sector{}
+	s.value = value
+	s.percent = value / totalValue
+	s.cx = cx
+	s.cy = cy
+	s.rx = radius
+	s.ry = radius
+	p := (currentValue + value/2) / totalValue
+	if p < 0.25 {
+		s.quadrant = 1
+	} else if p < 0.5 {
+		s.quadrant = 4
+	} else if p < 0.75 {
+		s.quadrant = 3
+	} else {
+		s.quadrant = 2
+	}
+	s.start = chart.PercentToRadians(currentValue/totalValue) - math.Pi/2
+	s.delta = chart.PercentToRadians(value / totalValue)
+	angle := s.start + s.delta/2
+	s.lineStartX = cx + int(radius*math.Cos(angle))
+	s.lineStartY = cy + int(radius*math.Sin(angle))
+	s.lineBranchX = cx + int(labelRadius*math.Cos(angle))
+	s.lineBranchY = cy + int(labelRadius*math.Sin(angle))
+	s.offset = labelLineLength
+	if s.lineBranchX <= cx {
+		s.offset *= -1
+	}
+	s.lineEndX = s.lineBranchX + s.offset
+	s.lineEndY = s.lineBranchY
+	s.series = series
+	s.color = color
+	s.showLabel = series.Label.Show
+	s.label = NewPieLabelFormatter([]string{label}, series.Label.Formatter)(0, s.value, s.percent)
+	return s
+}
+
+func (s *sector) calculateY(prevY int) int {
+	for i := 0; i <= s.cy; i++ {
+		if s.quadrant <= 2 {
+			if (prevY - s.lineBranchY) > labelFontSize+5 {
+				break
+			}
+			s.lineBranchY -= 1
+		} else {
+			if (s.lineBranchY - prevY) > labelFontSize+5 {
+				break
+			}
+			s.lineBranchY += 1
+		}
+	}
+	s.lineEndY = s.lineBranchY
+	return s.lineBranchY
+}
+
+func (s *sector) calculateTextXY(textBox Box) (x int, y int) {
+	textMargin := 3
+	x = s.lineEndX + textMargin
+	y = s.lineEndY + textBox.Height()>>1 - 1
+	if s.offset < 0 {
+		textWidth := textBox.Width()
+		x = s.lineEndX - textWidth - textMargin
+	}
+	return
+}
+
+func (p *pieChart) render(result *defaultRenderResult, seriesList SeriesList) (Box, error) {
+	opt := p.opt
+	values := make([]float64, len(seriesList))
+	total := float64(0)
+	radiusValue := ""
+	for index, series := range seriesList {
+		if len(series.Radius) != 0 {
+			radiusValue = series.Radius
+		}
+		value := float64(0)
+		for _, item := range series.Data {
+			value += item.Value
+		}
+		values[index] = value
+		total += value
+	}
+	if total <= 0 {
+		return BoxZero, errors.New("The sum value of pie chart should gt 0")
+	}
+	seriesPainter := result.seriesPainter
+	cx := seriesPainter.Width() >> 1
+	cy := seriesPainter.Height() >> 1
+
+	diameter := chart.MinInt(seriesPainter.Width(), seriesPainter.Height())
+	radius := getRadius(float64(diameter), radiusValue)
+
+	labelLineWidth := 15
+	if radius < 50 {
+		labelLineWidth = 10
+	}
+	labelRadius := radius + float64(labelLineWidth)
+	seriesNames := opt.Legend.Data
+	if len(seriesNames) == 0 {
+		seriesNames = seriesList.Names()
+	}
+	theme := opt.Theme
+
+	currentValue := float64(0)
+
+	var quadrant1, quadrant2, quadrant3, quadrant4 []sector
+	for index, v := range values {
+		series := seriesList[index]
+		color := theme.GetSeriesColor(index)
+		if index == len(values)-1 {
+			if color == theme.GetSeriesColor(0) {
+				color = theme.GetSeriesColor(1)
+			}
+		}
+		s := NewSector(cx, cy, radius, labelRadius, v, currentValue, total, labelLineWidth, seriesNames[index], series, color)
+		switch quadrant := s.quadrant; quadrant {
+		case 1:
+			quadrant1 = append([]sector{s}, quadrant1...)
+		case 2:
+			quadrant2 = append(quadrant2, s)
+		case 3:
+			quadrant3 = append([]sector{s}, quadrant3...)
+		case 4:
+			quadrant4 = append(quadrant4, s)
+		}
+		currentValue += v
+	}
+	sectors := append(quadrant1, quadrant4...)
+	sectors = append(sectors, quadrant3...)
+	sectors = append(sectors, quadrant2...)
+
+	currentQuadrant := 0
+	prevY := 0
+	maxY := 0
+	minY := 0
+	for _, s := range sectors {
+		seriesPainter.OverrideDrawingStyle(Style{
+			StrokeWidth: 1,
+			StrokeColor: s.color,
+			FillColor:   s.color,
+		})
+		seriesPainter.MoveTo(s.cx, s.cy)
+		seriesPainter.ArcTo(s.cx, s.cy, s.rx, s.ry, s.start, s.delta).LineTo(s.cx, s.cy).Close().FillStroke()
+		if !s.showLabel {
+			continue
+		}
+		if currentQuadrant != s.quadrant {
+			if s.quadrant == 1 {
+				minY = cy * 2
+				maxY = 0
+				prevY = cy * 2
+			}
+			if s.quadrant == 2 {
+				if currentQuadrant != 3 {
+					prevY = s.lineEndY
+				} else {
+					prevY = minY
+				}
+			}
+			if s.quadrant == 3 {
+				if currentQuadrant != 4 {
+					prevY = s.lineEndY
+				} else {
+					minY = cy * 2
+					maxY = 0
+					prevY = 0
+				}
+			}
+			if s.quadrant == 4 {
+				if currentQuadrant != 1 {
+					prevY = s.lineEndY
+				} else {
+					prevY = maxY
+				}
+			}
+			currentQuadrant = s.quadrant
+		}
+		prevY = s.calculateY(prevY)
+		if prevY > maxY {
+			maxY = prevY
+		}
+		if prevY < minY {
+			minY = prevY
+		}
+		seriesPainter.MoveTo(s.lineStartX, s.lineStartY)
+		seriesPainter.LineTo(s.lineBranchX, s.lineBranchY)
+		seriesPainter.MoveTo(s.lineBranchX, s.lineBranchY)
+		seriesPainter.LineTo(s.lineEndX, s.lineEndY)
+		seriesPainter.Stroke()
+		textStyle := Style{
+			FontColor: theme.GetTextColor(),
+			FontSize:  labelFontSize,
+			Font:      opt.Font,
+		}
+		if !s.series.Label.Color.IsZero() {
+			textStyle.FontColor = s.series.Label.Color
+		}
+		seriesPainter.OverrideTextStyle(textStyle)
+		x, y := s.calculateTextXY(seriesPainter.MeasureText(s.label))
+		seriesPainter.Text(s.label, x, y)
+	}
+	return p.p.box, nil
+}
+
+func (p *pieChart) Render() (Box, error) {
+	opt := p.opt
+
+	renderResult, err := defaultRender(p.p, defaultRenderOption{
+		Theme:      opt.Theme,
+		Padding:    opt.Padding,
+		SeriesList: opt.SeriesList,
+		XAxis: XAxisOption{
+			Show: FalseFlag(),
+		},
+		YAxisOptions: []YAxisOption{
+			{
+				Show: FalseFlag(),
+			},
+		},
+		TitleOption:        opt.Title,
+		LegendOption:       opt.Legend,
+		backgroundIsFilled: opt.backgroundIsFilled,
+	})
+	if err != nil {
+		return BoxZero, err
+	}
+	seriesList := opt.SeriesList.Filter(ChartTypePie)
+	return p.render(renderResult, seriesList)
+}

radar_chart.go

@@ -0,0 +1,273 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"errors"
+
+	"github.com/dustin/go-humanize"
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+type radarChart struct {
+	p   *Painter
+	opt *RadarChartOption
+}
+
+type RadarIndicator struct {
+	// Indicator's name
+	Name string
+	// The maximum value of indicator
+	Max float64
+	// The minimum value of indicator
+	Min float64
+}
+
+type RadarChartOption struct {
+	// The theme
+	Theme ColorPalette
+	// The font size
+	Font *truetype.Font
+	// The data series list
+	SeriesList SeriesList
+	// The padding of line chart
+	Padding Box
+	// The option of title
+	Title TitleOption
+	// The legend option
+	Legend LegendOption
+	// The radar indicator list
+	RadarIndicators []RadarIndicator
+	// background is filled
+	backgroundIsFilled bool
+}
+
+// NewRadarIndicators returns a radar indicator list
+func NewRadarIndicators(names []string, values []float64) []RadarIndicator {
+	if len(names) != len(values) {
+		return nil
+	}
+	indicators := make([]RadarIndicator, len(names))
+	for index, name := range names {
+		indicators[index] = RadarIndicator{
+			Name: name,
+			Max:  values[index],
+		}
+	}
+	return indicators
+}
+
+// NewRadarChart returns a radar chart renderer
+func NewRadarChart(p *Painter, opt RadarChartOption) *radarChart {
+	if opt.Theme == nil {
+		opt.Theme = defaultTheme
+	}
+	return &radarChart{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+func (r *radarChart) render(result *defaultRenderResult, seriesList SeriesList) (Box, error) {
+	opt := r.opt
+	indicators := opt.RadarIndicators
+	sides := len(indicators)
+	if sides < 3 {
+		return BoxZero, errors.New("The count of indicator should be >= 3")
+	}
+	maxValues := make([]float64, len(indicators))
+	for _, series := range seriesList {
+		for index, item := range series.Data {
+			if index < len(maxValues) && item.Value > maxValues[index] {
+				maxValues[index] = item.Value
+			}
+		}
+	}
+	for index, indicator := range indicators {
+		if indicator.Max <= 0 {
+			indicators[index].Max = maxValues[index]
+		}
+	}
+
+	radiusValue := ""
+	for _, series := range seriesList {
+		if len(series.Radius) != 0 {
+			radiusValue = series.Radius
+		}
+	}
+
+	seriesPainter := result.seriesPainter
+	theme := opt.Theme
+
+	cx := seriesPainter.Width() >> 1
+	cy := seriesPainter.Height() >> 1
+	diameter := chart.MinInt(seriesPainter.Width(), seriesPainter.Height())
+	radius := getRadius(float64(diameter), radiusValue)
+
+	divideCount := 5
+	divideRadius := float64(int(radius / float64(divideCount)))
+	radius = divideRadius * float64(divideCount)
+
+	seriesPainter.OverrideDrawingStyle(Style{
+		StrokeColor: theme.GetAxisSplitLineColor(),
+		StrokeWidth: 1,
+	})
+	center := Point{
+		X: cx,
+		Y: cy,
+	}
+	for i := 0; i < divideCount; i++ {
+		seriesPainter.Polygon(center, divideRadius*float64(i+1), sides)
+	}
+	points := getPolygonPoints(center, radius, sides)
+	for _, p := range points {
+		seriesPainter.MoveTo(center.X, center.Y)
+		seriesPainter.LineTo(p.X, p.Y)
+		seriesPainter.Stroke()
+	}
+	seriesPainter.OverrideTextStyle(Style{
+		FontColor: theme.GetTextColor(),
+		FontSize:  labelFontSize,
+		Font:      opt.Font,
+	})
+	offset := 5
+	// 文本生成
+	for index, p := range points {
+		name := indicators[index].Name
+		b := seriesPainter.MeasureText(name)
+		isXCenter := p.X == center.X
+		isYCenter := p.Y == center.Y
+		isRight := p.X > center.X
+		isLeft := p.X < center.X
+		isTop := p.Y < center.Y
+		isBottom := p.Y > center.Y
+		x := p.X
+		y := p.Y
+		if isXCenter {
+			x -= b.Width() >> 1
+			if isTop {
+				y -= b.Height()
+			} else {
+				y += b.Height()
+			}
+		}
+		if isYCenter {
+			y += b.Height() >> 1
+		}
+		if isTop {
+			y += offset
+		}
+		if isBottom {
+			y += offset
+		}
+		if isRight {
+			x += offset
+		}
+		if isLeft {
+			x -= (b.Width() + offset)
+		}
+		seriesPainter.Text(name, x, y)
+	}
+
+	// 雷达图
+	angles := getPolygonPointAngles(sides)
+	maxCount := len(indicators)
+	for _, series := range seriesList {
+		linePoints := make([]Point, 0, maxCount)
+		for j, item := range series.Data {
+			if j >= maxCount {
+				continue
+			}
+			indicator := indicators[j]
+			var percent float64
+			offset := indicator.Max - indicator.Min
+			if offset > 0 {
+				percent = (item.Value - indicator.Min) / offset
+			}
+			r := percent * radius
+			p := getPolygonPoint(center, r, angles[j])
+			linePoints = append(linePoints, p)
+		}
+		color := theme.GetSeriesColor(series.index)
+		dotFillColor := drawing.ColorWhite
+		if theme.IsDark() {
+			dotFillColor = color
+		}
+		linePoints = append(linePoints, linePoints[0])
+		seriesPainter.OverrideDrawingStyle(Style{
+			StrokeColor: color,
+			StrokeWidth: defaultStrokeWidth,
+			DotWidth:    defaultDotWidth,
+			DotColor:    color,
+			FillColor:   color.WithAlpha(20),
+		})
+		seriesPainter.LineStroke(linePoints).
+			FillArea(linePoints)
+		dotWith := 2.0
+		seriesPainter.OverrideDrawingStyle(Style{
+			StrokeWidth: defaultStrokeWidth,
+			StrokeColor: color,
+			FillColor:   dotFillColor,
+		})
+		for index, point := range linePoints {
+			seriesPainter.Circle(dotWith, point.X, point.Y)
+			seriesPainter.FillStroke()
+			if series.Label.Show && index < len(series.Data) {
+				value := humanize.FtoaWithDigits(series.Data[index].Value, 2)
+				b := seriesPainter.MeasureText(value)
+				seriesPainter.Text(value, point.X-b.Width()/2, point.Y)
+			}
+
+		}
+	}
+
+	return r.p.box, nil
+}
+
+func (r *radarChart) Render() (Box, error) {
+	p := r.p
+	opt := r.opt
+	renderResult, err := defaultRender(p, defaultRenderOption{
+		Theme:      opt.Theme,
+		Padding:    opt.Padding,
+		SeriesList: opt.SeriesList,
+		XAxis: XAxisOption{
+			Show: FalseFlag(),
+		},
+		YAxisOptions: []YAxisOption{
+			{
+				Show: FalseFlag(),
+			},
+		},
+		TitleOption:        opt.Title,
+		LegendOption:       opt.Legend,
+		backgroundIsFilled: opt.backgroundIsFilled,
+	})
+	if err != nil {
+		return BoxZero, err
+	}
+	seriesList := opt.SeriesList.Filter(ChartTypeRadar)
+	return r.render(renderResult, seriesList)
+}

range.go

@@ -0,0 +1,144 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"math"
+)
+
+const defaultAxisDivideCount = 6
+
+type axisRange struct {
+	p           *Painter
+	divideCount int
+	min         float64
+	max         float64
+	size        int
+	boundary    bool
+}
+
+type AxisRangeOption struct {
+	Painter *Painter
+	// The min value of axis
+	Min float64
+	// The max value of axis
+	Max float64
+	// The size of axis
+	Size int
+	// Boundary gap
+	Boundary bool
+	// The count of divide
+	DivideCount int
+}
+
+// NewRange returns a axis range
+func NewRange(opt AxisRangeOption) axisRange {
+	max := opt.Max
+	min := opt.Min
+
+	max += math.Abs(max * 0.1)
+	min -= math.Abs(min * 0.1)
+	divideCount := opt.DivideCount
+	r := math.Abs(max - min)
+
+	// 最小单位计算
+	unit := 1
+	if r > 5 {
+		unit = 2
+	}
+	if r > 10 {
+		unit = 4
+	}
+	if r > 30 {
+		unit = 5
+	}
+	if r > 100 {
+		unit = 10
+	}
+	if r > 200 {
+		unit = 20
+	}
+	unit = int((r/float64(divideCount))/float64(unit))*unit + unit
+
+	if min != 0 {
+		isLessThanZero := min < 0
+		min = float64(int(min/float64(unit)) * unit)
+		// 如果是小于0，int的时候向上取整了，因此调整
+		if min < 0 ||
+			(isLessThanZero && min == 0) {
+			min -= float64(unit)
+		}
+	}
+	max = min + float64(unit*divideCount)
+	expectMax := opt.Max * 2
+	if max > expectMax {
+		max = float64(ceilFloatToInt(expectMax))
+	}
+	return axisRange{
+		p:           opt.Painter,
+		divideCount: divideCount,
+		min:         min,
+		max:         max,
+		size:        opt.Size,
+		boundary:    opt.Boundary,
+	}
+}
+
+// Values returns values of range
+func (r axisRange) Values() []string {
+	offset := (r.max - r.min) / float64(r.divideCount)
+	values := make([]string, 0)
+	formatter := commafWithDigits
+	if r.p != nil && r.p.valueFormatter != nil {
+		formatter = r.p.valueFormatter
+	}
+	for i := 0; i <= r.divideCount; i++ {
+		v := r.min + float64(i)*offset
+		value := formatter(v)
+		values = append(values, value)
+	}
+	return values
+}
+
+func (r *axisRange) getHeight(value float64) int {
+	if r.max <= r.min {
+		return 0
+	}
+	v := (value - r.min) / (r.max - r.min)
+	return int(v * float64(r.size))
+}
+
+func (r *axisRange) getRestHeight(value float64) int {
+	return r.size - r.getHeight(value)
+}
+
+// GetRange returns a range of index
+func (r *axisRange) GetRange(index int) (float64, float64) {
+	unit := float64(r.size) / float64(r.divideCount)
+	return unit * float64(index), unit * float64(index+1)
+}
+
+// AutoDivide divides the axis
+func (r *axisRange) AutoDivide() []int {
+	return autoDivide(r.size, r.divideCount)
+}

series.go

@@ -0,0 +1,318 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+package charts
+
+import (
+	"math"
+	"strings"
+
+	"github.com/dustin/go-humanize"
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+type SeriesData struct {
+	// The value of series data
+	Value float64
+	// The style of series data
+	Style Style
+}
+
+// NewSeriesListDataFromValues returns a series list
+func NewSeriesListDataFromValues(values [][]float64, chartType ...string) SeriesList {
+	seriesList := make(SeriesList, len(values))
+	for index, value := range values {
+		seriesList[index] = NewSeriesFromValues(value, chartType...)
+	}
+	return seriesList
+}
+
+// NewSeriesFromValues returns a series
+func NewSeriesFromValues(values []float64, chartType ...string) Series {
+	s := Series{
+		Data: NewSeriesDataFromValues(values),
+	}
+	if len(chartType) != 0 {
+		s.Type = chartType[0]
+	}
+	return s
+}
+
+// NewSeriesDataFromValues return a series data
+func NewSeriesDataFromValues(values []float64) []SeriesData {
+	data := make([]SeriesData, len(values))
+	for index, value := range values {
+		data[index] = SeriesData{
+			Value: value,
+		}
+	}
+	return data
+}
+
+type SeriesLabel struct {
+	// Data label formatter, which supports string template.
+	// {b}: the name of a data item.
+	// {c}: the value of a data item.
+	// {d}: the percent of a data item(pie chart).
+	Formatter string
+	// The color for label
+	Color Color
+	// Show flag for label
+	Show bool
+	// Distance to the host graphic element.
+	Distance int
+	// The position of label
+	Position string
+	// The offset of label's position
+	Offset Box
+	// The font size of label
+	FontSize float64
+}
+
+const (
+	SeriesMarkDataTypeMax     = "max"
+	SeriesMarkDataTypeMin     = "min"
+	SeriesMarkDataTypeAverage = "average"
+)
+
+type SeriesMarkData struct {
+	// The mark data type, it can be "max", "min", "average".
+	// The "average" is only for mark line
+	Type string
+}
+type SeriesMarkPoint struct {
+	// The width of symbol, default value is 30
+	SymbolSize int
+	// The mark data of series mark point
+	Data []SeriesMarkData
+}
+type SeriesMarkLine struct {
+	// The mark data of series mark line
+	Data []SeriesMarkData
+}
+type Series struct {
+	index int
+	// The type of series, it can be "line", "bar" or "pie".
+	// Default value is "line"
+	Type string
+	// The data list of series
+	Data []SeriesData
+	// The Y axis index, it should be 0 or 1.
+	// Default value is 0
+	AxisIndex int
+	// The style for series
+	Style chart.Style
+	// The label for series
+	Label SeriesLabel
+	// The name of series
+	Name string
+	// Radius for Pie chart, e.g.: 40%, default is "40%"
+	Radius string
+	// Round for bar chart
+	RoundRadius int
+	// Mark point for series
+	MarkPoint SeriesMarkPoint
+	// Make line for series
+	MarkLine SeriesMarkLine
+	// Max value of series
+	Min *float64
+	// Min value of series
+	Max *float64
+}
+type SeriesList []Series
+
+func (sl SeriesList) init() {
+	if len(sl) == 0 {
+		return
+	}
+	if sl[len(sl)-1].index != 0 {
+		return
+	}
+	for i := 0; i < len(sl); i++ {
+		if sl[i].Type == "" {
+			sl[i].Type = ChartTypeLine
+		}
+		sl[i].index = i
+	}
+}
+
+func (sl SeriesList) Filter(chartType string) SeriesList {
+	arr := make(SeriesList, 0)
+	for index, item := range sl {
+		if item.Type == chartType {
+			arr = append(arr, sl[index])
+		}
+	}
+	return arr
+}
+
+// GetMaxMin get max and min value of series list
+func (sl SeriesList) GetMaxMin(axisIndex int) (float64, float64) {
+	min := math.MaxFloat64
+	max := -math.MaxFloat64
+	for _, series := range sl {
+		if series.AxisIndex != axisIndex {
+			continue
+		}
+		for _, item := range series.Data {
+			// 如果为空值，忽略
+			if item.Value == nullValue {
+				continue
+			}
+			if item.Value > max {
+				max = item.Value
+			}
+			if item.Value < min {
+				min = item.Value
+			}
+		}
+	}
+	return max, min
+}
+
+type PieSeriesOption struct {
+	Radius string
+	Label  SeriesLabel
+	Names  []string
+}
+
+func NewPieSeriesList(values []float64, opts ...PieSeriesOption) SeriesList {
+	result := make([]Series, len(values))
+	var opt PieSeriesOption
+	if len(opts) != 0 {
+		opt = opts[0]
+	}
+	for index, v := range values {
+		name := ""
+		if index < len(opt.Names) {
+			name = opt.Names[index]
+		}
+		s := Series{
+			Type: ChartTypePie,
+			Data: []SeriesData{
+				{
+					Value: v,
+				},
+			},
+			Radius: opt.Radius,
+			Label:  opt.Label,
+			Name:   name,
+		}
+		result[index] = s
+	}
+	return result
+}
+
+type seriesSummary struct {
+	// The index of max value
+	MaxIndex int
+	// The max value
+	MaxValue float64
+	// The index of min value
+	MinIndex int
+	// The min value
+	MinValue float64
+	// THe average value
+	AverageValue float64
+}
+
+// Summary get summary of series
+func (s *Series) Summary() seriesSummary {
+	minIndex := -1
+	maxIndex := -1
+	minValue := math.MaxFloat64
+	maxValue := -math.MaxFloat64
+	sum := float64(0)
+	for j, item := range s.Data {
+		if item.Value < minValue {
+			minIndex = j
+			minValue = item.Value
+		}
+		if item.Value > maxValue {
+			maxIndex = j
+			maxValue = item.Value
+		}
+		sum += item.Value
+	}
+	return seriesSummary{
+		MaxIndex:     maxIndex,
+		MaxValue:     maxValue,
+		MinIndex:     minIndex,
+		MinValue:     minValue,
+		AverageValue: sum / float64(len(s.Data)),
+	}
+}
+
+// Names returns the names of series list
+func (sl SeriesList) Names() []string {
+	names := make([]string, len(sl))
+	for index, s := range sl {
+		names[index] = s.Name
+	}
+	return names
+}
+
+// LabelFormatter label formatter
+type LabelFormatter func(index int, value float64, percent float64) string
+
+// NewPieLabelFormatter returns a pie label formatter
+func NewPieLabelFormatter(seriesNames []string, layout string) LabelFormatter {
+	if len(layout) == 0 {
+		layout = "{b}: {d}"
+	}
+	return NewLabelFormatter(seriesNames, layout)
+}
+
+// NewFunnelLabelFormatter returns a funner label formatter
+func NewFunnelLabelFormatter(seriesNames []string, layout string) LabelFormatter {
+	if len(layout) == 0 {
+		layout = "{b}({d})"
+	}
+	return NewLabelFormatter(seriesNames, layout)
+}
+
+// NewValueLabelFormatter returns a value formatter
+func NewValueLabelFormatter(seriesNames []string, layout string) LabelFormatter {
+	if len(layout) == 0 {
+		layout = "{c}"
+	}
+	return NewLabelFormatter(seriesNames, layout)
+}
+
+// NewLabelFormatter returns a label formaatter
+func NewLabelFormatter(seriesNames []string, layout string) LabelFormatter {
+	return func(index int, value, percent float64) string {
+		// 如果无percent的则设置为<0
+		percentText := ""
+		if percent >= 0 {
+			percentText = humanize.FtoaWithDigits(percent*100, 2) + "%"
+		}
+		valueText := humanize.FtoaWithDigits(value, 2)
+		name := ""
+		if len(seriesNames) > index {
+			name = seriesNames[index]
+		}
+		text := strings.ReplaceAll(layout, "{c}", valueText)
+		text = strings.ReplaceAll(text, "{d}", percentText)
+		text = strings.ReplaceAll(text, "{b}", name)
+		return text
+	}
+}

series_label.go

@@ -0,0 +1,148 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2"
+)
+
+type labelRenderValue struct {
+	Text  string
+	Style Style
+	X     int
+	Y     int
+	// 旋转
+	Radians float64
+}
+
+type LabelValue struct {
+	Index int
+	Value float64
+	X     int
+	Y     int
+	// 旋转
+	Radians float64
+	// 字体颜色
+	FontColor Color
+	// 字体大小
+	FontSize float64
+	Orient   string
+	Offset   Box
+}
+
+type SeriesLabelPainter struct {
+	p           *Painter
+	seriesNames []string
+	label       *SeriesLabel
+	theme       ColorPalette
+	font        *truetype.Font
+	values      []labelRenderValue
+}
+
+type SeriesLabelPainterParams struct {
+	P           *Painter
+	SeriesNames []string
+	Label       SeriesLabel
+	Theme       ColorPalette
+	Font        *truetype.Font
+}
+
+func NewSeriesLabelPainter(params SeriesLabelPainterParams) *SeriesLabelPainter {
+	return &SeriesLabelPainter{
+		p:           params.P,
+		seriesNames: params.SeriesNames,
+		label:       &params.Label,
+		theme:       params.Theme,
+		font:        params.Font,
+		values:      make([]labelRenderValue, 0),
+	}
+}
+
+func (o *SeriesLabelPainter) Add(value LabelValue) {
+	label := o.label
+	distance := label.Distance
+	if distance == 0 {
+		distance = 5
+	}
+	text := NewValueLabelFormatter(o.seriesNames, label.Formatter)(value.Index, value.Value, -1)
+	labelStyle := Style{
+		FontColor: o.theme.GetTextColor(),
+		FontSize:  labelFontSize,
+		Font:      o.font,
+	}
+	if value.FontSize != 0 {
+		labelStyle.FontSize = value.FontSize
+	}
+	if !value.FontColor.IsZero() {
+		label.Color = value.FontColor
+	}
+	if !label.Color.IsZero() {
+		labelStyle.FontColor = label.Color
+	}
+	p := o.p
+	p.OverrideDrawingStyle(labelStyle)
+	rotated := value.Radians != 0
+	if rotated {
+		p.SetTextRotation(value.Radians)
+	}
+	textBox := p.MeasureText(text)
+	renderValue := labelRenderValue{
+		Text:    text,
+		Style:   labelStyle,
+		X:       value.X,
+		Y:       value.Y,
+		Radians: value.Radians,
+	}
+	if value.Orient != OrientHorizontal {
+		renderValue.X -= textBox.Width() >> 1
+		renderValue.Y -= distance
+	} else {
+		renderValue.X += distance
+		renderValue.Y += textBox.Height() >> 1
+		renderValue.Y -= 2
+	}
+	if rotated {
+		renderValue.X = value.X + textBox.Width()>>1 - 1
+		p.ClearTextRotation()
+	} else {
+		if textBox.Width()%2 != 0 {
+			renderValue.X++
+		}
+	}
+	renderValue.X += value.Offset.Left
+	renderValue.Y += value.Offset.Top
+	o.values = append(o.values, renderValue)
+}
+
+func (o *SeriesLabelPainter) Render() (Box, error) {
+	for _, item := range o.values {
+		o.p.OverrideTextStyle(item.Style)
+		if item.Radians != 0 {
+			o.p.TextRotation(item.Text, item.X, item.Y, item.Radians)
+		} else {
+			o.p.Text(item.Text, item.X, item.Y)
+		}
+	}
+	return chart.BoxZero, nil
+}

series_test.go

@@ -0,0 +1,89 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewSeriesListDataFromValues(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal(SeriesList{
+		{
+			Type: ChartTypeBar,
+			Data: []SeriesData{
+				{
+					Value: 1.0,
+				},
+			},
+		},
+	}, NewSeriesListDataFromValues([][]float64{
+		{
+			1,
+		},
+	}, ChartTypeBar))
+}
+
+func TestSeriesLists(t *testing.T) {
+	assert := assert.New(t)
+	seriesList := NewSeriesListDataFromValues([][]float64{
+		{
+			1,
+			2,
+		},
+		{
+			10,
+		},
+	}, ChartTypeBar)
+
+	assert.Equal(2, len(seriesList.Filter(ChartTypeBar)))
+	assert.Equal(0, len(seriesList.Filter(ChartTypeLine)))
+
+	max, min := seriesList.GetMaxMin(0)
+	assert.Equal(float64(10), max)
+	assert.Equal(float64(1), min)
+
+	assert.Equal(seriesSummary{
+		MaxIndex:     1,
+		MaxValue:     2,
+		MinIndex:     0,
+		MinValue:     1,
+		AverageValue: 1.5,
+	}, seriesList[0].Summary())
+}
+
+func TestFormatter(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal("a: 12%", NewPieLabelFormatter([]string{
+		"a",
+		"b",
+	}, "")(0, 10, 0.12))
+
+	assert.Equal("10", NewValueLabelFormatter([]string{
+		"a",
+		"b",
+	}, "")(0, 10, 0.12))
+}

start_zh.md

@@ -0,0 +1,254 @@
+# go-charts
+
+`go-charts`主要分为了下几个模块：
+
+- `标题`：图表的标题，包括主副标题，位置为图表的顶部
+- `图例`：图表的图例列表，用于标识每个图例对应的颜色与名称信息，默认为图表的顶部，可自定义位置
+- `X轴`：图表的x轴，用于折线图、柱状图中，表示每个点对应的时间，位置图表的底部
+- `Y轴`：图表的y轴，用于折线图、柱状图中，最多可使用两组y轴（一左一右），默认位置图表的左侧
+- `内容`: 图表的内容，折线图、柱状图、饼图等，在图表的中间区域
+
+## 标题
+
+### 常用设置
+
+标题一般仅需要设置主副标题即可，其它的属性均会设置默认值，常用的方式是使用`TitleTextOptionFunc`设置，其中副标题为可选值，方式如下：
+
+```go
+    charts.TitleTextOptionFunc("Text", "Subtext"),
+```
+
+### 个性化设置
+
+```go
+func(opt *charts.ChartOption) {
+    opt.Title = charts.TitleOption{
+        // 主标题
+        Text: "Text",
+        // 副标题
+        Subtext: "Subtext",
+        // 标题左侧位置，可设置为"center"，"right"，数值("20")或百份比("20%")
+        Left: charts.PositionRight,
+        // 标题顶部位置，只可调为数值
+        Top: "20",
+        // 主标题文字大小
+        FontSize: 14,
+        // 副标题文字大小
+        SubtextFontSize: 12,
+        // 主标题字体颜色
+        FontColor: charts.Color{
+            R: 100,
+            G: 100,
+            B: 100,
+            A: 255,
+        },
+        // 副标题字体影响
+        SubtextFontColor: charts.Color{
+            R: 200,
+            G: 200,
+            B: 200,
+            A: 255,
+        },
+    }
+},
+```
+
+### 部分属性个性化设置
+
+```go
+charts.TitleTextOptionFunc("Text", "Subtext"),
+func(opt *charts.ChartOption) {
+    // 修改top的值
+    opt.Title.Top = "20"
+},
+```
+
+## 图例
+
+### 常用设置
+
+图例组件与图表中的数据一一对应，常用仅设置其名称及左侧的值即可(可选)，方式如下：
+
+
+```go
+charts.LegendLabelsOptionFunc([]string{
+    "Email",
+    "Union Ads",
+    "Video Ads",
+    "Direct",
+    "Search Engine",
+}, "50"),
+```
+
+### 个性化设置
+
+```go
+func(opt *charts.ChartOption) {
+    opt.Legend = charts.LegendOption{
+        // 图例名称
+        Data: []string{
+            "Email",
+            "Union Ads",
+            "Video Ads",
+            "Direct",
+            "Search Engine",
+        },
+        // 图例左侧位置，可设置为"center"，"right"，数值("20")或百份比("20%")
+        // 如果示例有多行，只影响第一行，而且对于多行的示例，设置"center", "right"无效
+        Left: "50",
+        // 图例顶部位置，只可调为数值
+        Top: "10",
+        // 图例图标的位置，默认为左侧，只允许左或右
+        Align: charts.AlignRight,
+        // 图例排列方式，默认为水平，只允许水平或垂直
+        Orient: charts.OrientVertical,
+        // 图标类型，提供"rect"与"lineDot"两种类型
+        Icon: charts.IconRect,
+        // 字体大小
+        FontSize: 14,
+        // 字体颜色
+        FontColor: charts.Color{
+            R: 150,
+            G: 150,
+            B: 150,
+            A: 255,
+        },
+        // 是否展示，如果不需要展示则设置
+        // Show: charts.FalseFlag(),
+        // 图例区域的padding值
+        Padding: charts.Box{
+            Top:  10,
+            Left: 10,
+        },
+    }
+},
+```
+
+### 部分属性个性化设置
+
+```go
+charts.LegendLabelsOptionFunc([]string{
+    "Email",
+    "Union Ads",
+    "Video Ads",
+    "Direct",
+    "Search Engine",
+}, "50"),
+func(opt *charts.ChartOption) {
+    opt.Legend.Top = "10"
+},
+```
+
+## X轴
+
+### 常用设置
+
+图表中X轴的展示，常用的设置方式是指定数组即可：
+
+```go
+charts.XAxisDataOptionFunc([]string{
+    "Mon",
+    "Tue",
+    "Wed",
+    "Thu",
+    "Fri",
+    "Sat",
+    "Sun",
+}),
+```
+
+### 个性化设置
+
+```go
+func(opt *charts.ChartOption) {
+    opt.XAxis = charts.XAxisOption{
+        // X轴内容
+        Data: []string{
+            "01",
+            "02",
+            "03",
+            "04",
+            "05",
+            "06",
+            "07",
+            "08",
+            "09",
+        },
+        // 如果数据点不居中，则设置为false
+        BoundaryGap: charts.FalseFlag(),
+        // 字体大小
+        FontSize: 14,
+        // 是否展示，如果不需要展示则设置
+        // Show: charts.FalseFlag(),
+        // 会根据文本内容以及此值选择适合的分块大小，一般不需要设置
+        // SplitNumber: 3,
+        // 线条颜色
+        StrokeColor: charts.Color{
+            R: 200,
+            G: 200,
+            B: 200,
+            A: 255,
+        },
+        // 文字颜色
+        FontColor: charts.Color{
+            R: 100,
+            G: 100,
+            B: 100,
+            A: 255,
+        },
+    }
+},
+```
+
+### 部分属性个性化设置
+
+```go
+charts.XAxisDataOptionFunc([]string{
+    "Mon",
+    "Tue",
+    "Wed",
+    "Thu",
+    "Fri",
+    "Sat",
+    "Sun",
+}),
+func(opt *charts.ChartOption) {
+    opt.XAxis.FontColor = charts.Color{
+        R: 100,
+        G: 100,
+        B: 100,
+        A: 255,
+    },
+},
+```
+
+## Y轴
+
+图表中的y轴展示的相关数据会根据图表中的数据自动生成适合的值，如果需要自定义，则可自定义以下部分数据：
+
+```go
+func(opt *charts.ChartOption) {
+    opt.YAxisOptions = []charts.YAxisOption{
+        {
+            // 字体大小
+            FontSize: 16,
+            // 字体颜色
+            FontColor: charts.Color{
+                R: 100,
+                G: 100,
+                B: 100,
+                A: 255,
+            },
+            // 内容，{value}会替换为对应的值
+            Formatter: "{value} ml",
+            // Y轴颜色，如果设置此值，会覆盖font color
+            Color: charts.Color{
+                R: 255,
+                G: 0,
+                B: 0,
+                A: 255,
+            },
+        },
+    }
+},
+```

table.go

@@ -0,0 +1,438 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"errors"
+
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+type tableChart struct {
+	p   *Painter
+	opt *TableChartOption
+}
+
+// NewTableChart returns a table chart render
+func NewTableChart(p *Painter, opt TableChartOption) *tableChart {
+	if opt.Theme == nil {
+		opt.Theme = defaultTheme
+	}
+	return &tableChart{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+type TableCell struct {
+	// Text the text of table cell
+	Text string
+	// Style the current style of table cell
+	Style Style
+	// Row the row index of table cell
+	Row int
+	// Column the column index of table cell
+	Column int
+}
+
+type TableChartOption struct {
+	// The output type
+	Type string
+	// The width of table
+	Width int
+	// The theme
+	Theme ColorPalette
+	// The padding of table cell
+	Padding Box
+	// The header data of table
+	Header []string
+	// The data of table
+	Data [][]string
+	// The span list of table column
+	Spans []int
+	// The text align list of table cell
+	TextAligns []string
+	// The font size of table
+	FontSize float64
+	// The font family, which should be installed first
+	FontFamily string
+	Font       *truetype.Font
+	// The font color of table
+	FontColor Color
+	// The background color of header
+	HeaderBackgroundColor Color
+	// The header font color
+	HeaderFontColor Color
+	// The background color of row
+	RowBackgroundColors []Color
+	// The background color
+	BackgroundColor Color
+	// CellTextStyle customize text style of table cell
+	CellTextStyle func(TableCell) *Style
+	// CellStyle customize drawing style of table cell
+	CellStyle func(TableCell) *Style
+}
+
+type TableSetting struct {
+	// The color of header
+	HeaderColor Color
+	// The color of heder text
+	HeaderFontColor Color
+	// The color of table text
+	FontColor Color
+	// The color list of row
+	RowColors []Color
+	// The padding of cell
+	Padding Box
+}
+
+var TableLightThemeSetting = TableSetting{
+	HeaderColor: Color{
+		R: 240,
+		G: 240,
+		B: 240,
+		A: 255,
+	},
+	HeaderFontColor: Color{
+		R: 98,
+		G: 105,
+		B: 118,
+		A: 255,
+	},
+	FontColor: Color{
+		R: 70,
+		G: 70,
+		B: 70,
+		A: 255,
+	},
+	RowColors: []Color{
+		drawing.ColorWhite,
+		{
+			R: 247,
+			G: 247,
+			B: 247,
+			A: 255,
+		},
+	},
+	Padding: Box{
+		Left:   10,
+		Top:    10,
+		Right:  10,
+		Bottom: 10,
+	},
+}
+
+var TableDarkThemeSetting = TableSetting{
+	HeaderColor: Color{
+		R: 38,
+		G: 38,
+		B: 42,
+		A: 255,
+	},
+	HeaderFontColor: Color{
+		R: 216,
+		G: 217,
+		B: 218,
+		A: 255,
+	},
+	FontColor: Color{
+		R: 216,
+		G: 217,
+		B: 218,
+		A: 255,
+	},
+	RowColors: []Color{
+		{
+			R: 24,
+			G: 24,
+			B: 28,
+			A: 255,
+		},
+		{
+			R: 38,
+			G: 38,
+			B: 42,
+			A: 255,
+		},
+	},
+	Padding: Box{
+		Left:   10,
+		Top:    10,
+		Right:  10,
+		Bottom: 10,
+	},
+}
+
+var tableDefaultSetting = TableLightThemeSetting
+
+// SetDefaultTableSetting sets the default setting for table
+func SetDefaultTableSetting(setting TableSetting) {
+	tableDefaultSetting = setting
+}
+
+type renderInfo struct {
+	Width        int
+	Height       int
+	HeaderHeight int
+	RowHeights   []int
+	ColumnWidths []int
+}
+
+func (t *tableChart) render() (*renderInfo, error) {
+	info := renderInfo{
+		RowHeights: make([]int, 0),
+	}
+	p := t.p
+	opt := t.opt
+	if len(opt.Header) == 0 {
+		return nil, errors.New("header can not be nil")
+	}
+	theme := opt.Theme
+	if theme == nil {
+		theme = p.theme
+	}
+	fontSize := opt.FontSize
+	if fontSize == 0 {
+		fontSize = 12
+	}
+	fontColor := opt.FontColor
+	if fontColor.IsZero() {
+		fontColor = tableDefaultSetting.FontColor
+	}
+	font := opt.Font
+	if font == nil {
+		font = theme.GetFont()
+	}
+	headerFontColor := opt.HeaderFontColor
+	if opt.HeaderFontColor.IsZero() {
+		headerFontColor = tableDefaultSetting.HeaderFontColor
+	}
+
+	spans := opt.Spans
+	if len(spans) != len(opt.Header) {
+		newSpans := make([]int, len(opt.Header))
+		for index := range opt.Header {
+			if index >= len(spans) {
+				newSpans[index] = 1
+			} else {
+				newSpans[index] = spans[index]
+			}
+		}
+		spans = newSpans
+	}
+
+	sum := sumInt(spans)
+	values := autoDivideSpans(p.Width(), sum, spans)
+	columnWidths := make([]int, 0)
+	for index, v := range values {
+		if index == len(values)-1 {
+			break
+		}
+		columnWidths = append(columnWidths, values[index+1]-v)
+	}
+	info.ColumnWidths = columnWidths
+
+	height := 0
+	textStyle := Style{
+		FontSize:  fontSize,
+		FontColor: headerFontColor,
+		FillColor: headerFontColor,
+		Font:      font,
+	}
+
+	headerHeight := 0
+	padding := opt.Padding
+	if padding.IsZero() {
+		padding = tableDefaultSetting.Padding
+	}
+	getCellTextStyle := opt.CellTextStyle
+	if getCellTextStyle == nil {
+		getCellTextStyle = func(_ TableCell) *Style {
+			return nil
+		}
+	}
+	// textAligns := opt.TextAligns
+	getTextAlign := func(index int) string {
+		if len(opt.TextAligns) <= index {
+			return ""
+		}
+		return opt.TextAligns[index]
+	}
+
+	// 表格单元的处理
+	renderTableCells := func(
+		currentStyle Style,
+		rowIndex int,
+		textList []string,
+		currentHeight int,
+		cellPadding Box,
+	) int {
+		cellMaxHeight := 0
+		paddingHeight := cellPadding.Top + cellPadding.Bottom
+		paddingWidth := cellPadding.Left + cellPadding.Right
+		for index, text := range textList {
+			cellStyle := getCellTextStyle(TableCell{
+				Text:   text,
+				Row:    rowIndex,
+				Column: index,
+				Style:  currentStyle,
+			})
+			if cellStyle == nil {
+				cellStyle = &currentStyle
+			}
+			p.SetStyle(*cellStyle)
+			x := values[index]
+			y := currentHeight + cellPadding.Top
+			width := values[index+1] - x
+			x += cellPadding.Left
+			width -= paddingWidth
+			box := p.TextFit(text, x, y+int(fontSize), width, getTextAlign(index))
+			// 计算最高的高度
+			if box.Height()+paddingHeight > cellMaxHeight {
+				cellMaxHeight = box.Height() + paddingHeight
+			}
+		}
+		return cellMaxHeight
+	}
+
+	// 表头的处理
+	headerHeight = renderTableCells(textStyle, 0, opt.Header, height, padding)
+	height += headerHeight
+	info.HeaderHeight = headerHeight
+
+	// 表格内容的处理
+	textStyle.FontColor = fontColor
+	textStyle.FillColor = fontColor
+	for index, textList := range opt.Data {
+		cellHeight := renderTableCells(textStyle, index+1, textList, height, padding)
+		info.RowHeights = append(info.RowHeights, cellHeight)
+		height += cellHeight
+	}
+
+	info.Width = p.Width()
+	info.Height = height
+	return &info, nil
+}
+
+func (t *tableChart) renderWithInfo(info *renderInfo) (Box, error) {
+	p := t.p
+	opt := t.opt
+	if !opt.BackgroundColor.IsZero() {
+		p.SetBackground(p.Width(), p.Height(), opt.BackgroundColor)
+	}
+	headerBGColor := opt.HeaderBackgroundColor
+	if headerBGColor.IsZero() {
+		headerBGColor = tableDefaultSetting.HeaderColor
+	}
+
+	// 如果设置表头背景色
+	p.SetBackground(info.Width, info.HeaderHeight, headerBGColor, true)
+	currentHeight := info.HeaderHeight
+	rowColors := opt.RowBackgroundColors
+	if rowColors == nil {
+		rowColors = tableDefaultSetting.RowColors
+	}
+	for index, h := range info.RowHeights {
+		color := rowColors[index%len(rowColors)]
+		child := p.Child(PainterPaddingOption(Box{
+			Top: currentHeight,
+		}))
+		child.SetBackground(p.Width(), h, color, true)
+		currentHeight += h
+	}
+	// 根据是否有设置表格样式调整背景色
+	getCellStyle := opt.CellStyle
+	if getCellStyle != nil {
+		arr := [][]string{
+			opt.Header,
+		}
+		arr = append(arr, opt.Data...)
+		top := 0
+		heights := []int{
+			info.HeaderHeight,
+		}
+		heights = append(heights, info.RowHeights...)
+		// 循环所有表格单元，生成背景色
+		for i, textList := range arr {
+			left := 0
+			for j, v := range textList {
+				style := getCellStyle(TableCell{
+					Text:   v,
+					Row:    i,
+					Column: j,
+				})
+				if style != nil && !style.FillColor.IsZero() {
+					padding := style.Padding
+					child := p.Child(PainterPaddingOption(Box{
+						Top:  top + padding.Top,
+						Left: left + padding.Left,
+					}))
+					w := info.ColumnWidths[j] - padding.Left - padding.Top
+					h := heights[i] - padding.Top - padding.Bottom
+					child.SetBackground(w, h, style.FillColor, true)
+				}
+				left += info.ColumnWidths[j]
+			}
+			top += heights[i]
+		}
+	}
+	_, err := t.render()
+	if err != nil {
+		return BoxZero, err
+	}
+
+	return Box{
+		Right:  info.Width,
+		Bottom: info.Height,
+	}, nil
+}
+
+func (t *tableChart) Render() (Box, error) {
+	p := t.p
+	opt := t.opt
+	if !opt.BackgroundColor.IsZero() {
+		p.SetBackground(p.Width(), p.Height(), opt.BackgroundColor)
+	}
+	if opt.Font == nil && opt.FontFamily != "" {
+		opt.Font, _ = GetFont(opt.FontFamily)
+	}
+
+	r := p.render
+	fn := chart.PNG
+	if p.outputType == ChartOutputSVG {
+		fn = chart.SVG
+	}
+	newRender, err := fn(p.Width(), 100)
+	if err != nil {
+		return BoxZero, err
+	}
+	p.render = newRender
+	info, err := t.render()
+	if err != nil {
+		return BoxZero, err
+	}
+	p.render = r
+	return t.renderWithInfo(info)
+}

table_test.go

@@ -0,0 +1,140 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTableChart(t *testing.T) {
+	assert := assert.New(t)
+
+	tests := []struct {
+		render func(*Painter) ([]byte, error)
+		result string
+	}{
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewTableChart(p, TableChartOption{
+					Header: []string{
+						"Name",
+						"Age",
+						"Address",
+						"Tag",
+						"Action",
+					},
+					Spans: []int{
+						1,
+						1,
+						2,
+						1,
+						// span和header不匹配，最后自动设置为1
+						// 1,
+					},
+					Data: [][]string{
+						{
+							"John Brown",
+							"32",
+							"New York No. 1 Lake Park",
+							"nice, developer",
+							"Send Mail",
+						},
+						{
+							"Jim Green	",
+							"42",
+							"London No. 1 Lake Park",
+							"wow",
+							"Send Mail",
+						},
+						{
+							"Joe Black	",
+							"32",
+							"Sidney No. 1 Lake Park",
+							"cool, teacher",
+							"Send Mail",
+						},
+					},
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 0 0\nL 600 0\nL 600 35\nL 0 35\nL 0 0\" style=\"stroke-width:0;stroke:none;fill:rgba(240,240,240,1.0)\"/><path  d=\"M 0 35\nL 600 35\nL 600 90\nL 0 90\nL 0 35\" style=\"stroke-width:0;stroke:none;fill:rgba(255,255,255,1.0)\"/><path  d=\"M 0 90\nL 600 90\nL 600 125\nL 0 125\nL 0 90\" style=\"stroke-width:0;stroke:none;fill:rgba(247,247,247,1.0)\"/><path  d=\"M 0 125\nL 600 125\nL 600 180\nL 0 180\nL 0 125\" style=\"stroke-width:0;stroke:none;fill:rgba(255,255,255,1.0)\"/><text x=\"10\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Name</text><text x=\"110\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Age</text><text x=\"210\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Address</text><text x=\"410\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Tag</text><text x=\"510\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Action</text><text x=\"10\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">John</text><text x=\"10\" y=\"77\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Brown</text><text x=\"110\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">32</text><text x=\"210\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">New York No. 1 Lake Park</text><text x=\"410\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">nice,</text><text x=\"410\" y=\"77\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">developer</text><text x=\"510\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Send Mail</text><text x=\"10\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Jim Green</text><text x=\"110\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">42</text><text x=\"210\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">London No. 1 Lake Park</text><text x=\"410\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">wow</text><text x=\"510\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Send Mail</text><text x=\"10\" y=\"147\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Joe Black</text><text x=\"110\" y=\"147\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">32</text><text x=\"210\" y=\"147\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sidney No. 1 Lake Park</text><text x=\"410\" y=\"147\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">cool,</text><text x=\"410\" y=\"167\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">teacher</text><text x=\"510\" y=\"147\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Send Mail</text></svg>",
+		},
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewTableChart(p, TableChartOption{
+					Header: []string{
+						"Name",
+						"Age",
+						"Address",
+						"Tag",
+						"Action",
+					},
+					Data: [][]string{
+						{
+							"John Brown",
+							"32",
+							"New York No. 1 Lake Park",
+							"nice, developer",
+							"Send Mail",
+						},
+						{
+							"Jim Green	",
+							"42",
+							"London No. 1 Lake Park",
+							"wow",
+							"Send Mail",
+						},
+						{
+							"Joe Black	",
+							"32",
+							"Sidney No. 1 Lake Park",
+							"cool, teacher",
+							"Send Mail",
+						},
+					},
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<path  d=\"M 0 0\nL 600 0\nL 600 35\nL 0 35\nL 0 0\" style=\"stroke-width:0;stroke:none;fill:rgba(240,240,240,1.0)\"/><path  d=\"M 0 35\nL 600 35\nL 600 90\nL 0 90\nL 0 35\" style=\"stroke-width:0;stroke:none;fill:rgba(255,255,255,1.0)\"/><path  d=\"M 0 90\nL 600 90\nL 600 145\nL 0 145\nL 0 90\" style=\"stroke-width:0;stroke:none;fill:rgba(247,247,247,1.0)\"/><path  d=\"M 0 145\nL 600 145\nL 600 200\nL 0 200\nL 0 145\" style=\"stroke-width:0;stroke:none;fill:rgba(255,255,255,1.0)\"/><text x=\"10\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Name</text><text x=\"130\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Age</text><text x=\"250\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Address</text><text x=\"370\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Tag</text><text x=\"490\" y=\"22\" style=\"stroke-width:0;stroke:none;fill:rgba(98,105,118,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Action</text><text x=\"10\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">John Brown</text><text x=\"130\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">32</text><text x=\"250\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">New York No.</text><text x=\"250\" y=\"77\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">1 Lake Park</text><text x=\"370\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">nice,</text><text x=\"370\" y=\"77\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">developer</text><text x=\"490\" y=\"57\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Send Mail</text><text x=\"10\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Jim Green</text><text x=\"130\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">42</text><text x=\"250\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">London No. 1</text><text x=\"250\" y=\"132\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Lake Park</text><text x=\"370\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">wow</text><text x=\"490\" y=\"112\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Send Mail</text><text x=\"10\" y=\"167\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Joe Black</text><text x=\"130\" y=\"167\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">32</text><text x=\"250\" y=\"167\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Sidney No. 1</text><text x=\"250\" y=\"187\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Lake Park</text><text x=\"370\" y=\"167\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">cool, teacher</text><text x=\"490\" y=\"167\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">Send Mail</text></svg>",
+		},
+	}
+	for _, tt := range tests {
+		p, err := NewPainter(PainterOptions{
+			Type:   ChartOutputSVG,
+			Width:  600,
+			Height: 400,
+		}, PainterThemeOption(defaultTheme))
+		assert.Nil(err)
+		data, err := tt.render(p)
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}

theme.go

@@ -0,0 +1,332 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"github.com/golang/freetype/truetype"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+const ThemeDark = "dark"
+const ThemeLight = "light"
+const ThemeGrafana = "grafana"
+const ThemeAnt = "ant"
+
+type ColorPalette interface {
+	IsDark() bool
+	GetAxisStrokeColor() Color
+	SetAxisStrokeColor(Color)
+	GetAxisSplitLineColor() Color
+	SetAxisSplitLineColor(Color)
+	GetSeriesColor(int) Color
+	SetSeriesColor([]Color)
+	GetBackgroundColor() Color
+	SetBackgroundColor(Color)
+	GetTextColor() Color
+	SetTextColor(Color)
+	GetFontSize() float64
+	SetFontSize(float64)
+	GetFont() *truetype.Font
+	SetFont(*truetype.Font)
+}
+
+type themeColorPalette struct {
+	isDarkMode         bool
+	axisStrokeColor    Color
+	axisSplitLineColor Color
+	backgroundColor    Color
+	textColor          Color
+	seriesColors       []Color
+	fontSize           float64
+	font               *truetype.Font
+}
+
+type ThemeOption struct {
+	IsDarkMode         bool
+	AxisStrokeColor    Color
+	AxisSplitLineColor Color
+	BackgroundColor    Color
+	TextColor          Color
+	SeriesColors       []Color
+}
+
+var palettes = map[string]*themeColorPalette{}
+
+const defaultFontSize = 12.0
+
+var defaultTheme ColorPalette
+
+var defaultLightFontColor = drawing.Color{
+	R: 70,
+	G: 70,
+	B: 70,
+	A: 255,
+}
+var defaultDarkFontColor = drawing.Color{
+	R: 238,
+	G: 238,
+	B: 238,
+	A: 255,
+}
+
+func init() {
+	echartSeriesColors := []Color{
+		parseColor("#5470c6"),
+		parseColor("#91cc75"),
+		parseColor("#fac858"),
+		parseColor("#ee6666"),
+		parseColor("#73c0de"),
+		parseColor("#3ba272"),
+		parseColor("#fc8452"),
+		parseColor("#9a60b4"),
+		parseColor("#ea7ccc"),
+	}
+	grafanaSeriesColors := []Color{
+		parseColor("#7EB26D"),
+		parseColor("#EAB839"),
+		parseColor("#6ED0E0"),
+		parseColor("#EF843C"),
+		parseColor("#E24D42"),
+		parseColor("#1F78C1"),
+		parseColor("#705DA0"),
+		parseColor("#508642"),
+	}
+	antSeriesColors := []Color{
+		parseColor("#5b8ff9"),
+		parseColor("#5ad8a6"),
+		parseColor("#5d7092"),
+		parseColor("#f6bd16"),
+		parseColor("#6f5ef9"),
+		parseColor("#6dc8ec"),
+		parseColor("#945fb9"),
+		parseColor("#ff9845"),
+	}
+	AddTheme(
+		ThemeDark,
+		ThemeOption{
+			IsDarkMode: true,
+			AxisStrokeColor: Color{
+				R: 185,
+				G: 184,
+				B: 206,
+				A: 255,
+			},
+			AxisSplitLineColor: Color{
+				R: 72,
+				G: 71,
+				B: 83,
+				A: 255,
+			},
+			BackgroundColor: Color{
+				R: 16,
+				G: 12,
+				B: 42,
+				A: 255,
+			},
+			TextColor: Color{
+				R: 238,
+				G: 238,
+				B: 238,
+				A: 255,
+			},
+			SeriesColors: echartSeriesColors,
+		},
+	)
+
+	AddTheme(
+		ThemeLight,
+		ThemeOption{
+			IsDarkMode: false,
+			AxisStrokeColor: Color{
+				R: 110,
+				G: 112,
+				B: 121,
+				A: 255,
+			},
+			AxisSplitLineColor: Color{
+				R: 224,
+				G: 230,
+				B: 242,
+				A: 255,
+			},
+			BackgroundColor: drawing.ColorWhite,
+			TextColor: Color{
+				R: 70,
+				G: 70,
+				B: 70,
+				A: 255,
+			},
+			SeriesColors: echartSeriesColors,
+		},
+	)
+	AddTheme(
+		ThemeAnt,
+		ThemeOption{
+			IsDarkMode: false,
+			AxisStrokeColor: Color{
+				R: 110,
+				G: 112,
+				B: 121,
+				A: 255,
+			},
+			AxisSplitLineColor: Color{
+				R: 224,
+				G: 230,
+				B: 242,
+				A: 255,
+			},
+			BackgroundColor: drawing.ColorWhite,
+			TextColor: drawing.Color{
+				R: 70,
+				G: 70,
+				B: 70,
+				A: 255,
+			},
+			SeriesColors: antSeriesColors,
+		},
+	)
+	AddTheme(
+		ThemeGrafana,
+		ThemeOption{
+			IsDarkMode: true,
+			AxisStrokeColor: Color{
+				R: 185,
+				G: 184,
+				B: 206,
+				A: 255,
+			},
+			AxisSplitLineColor: Color{
+				R: 68,
+				G: 67,
+				B: 67,
+				A: 255,
+			},
+			BackgroundColor: drawing.Color{
+				R: 31,
+				G: 29,
+				B: 29,
+				A: 255,
+			},
+			TextColor: Color{
+				R: 216,
+				G: 217,
+				B: 218,
+				A: 255,
+			},
+			SeriesColors: grafanaSeriesColors,
+		},
+	)
+	SetDefaultTheme(ThemeLight)
+}
+
+// SetDefaultTheme sets default theme
+func SetDefaultTheme(name string) {
+	defaultTheme = NewTheme(name)
+}
+
+func AddTheme(name string, opt ThemeOption) {
+	palettes[name] = &themeColorPalette{
+		isDarkMode:         opt.IsDarkMode,
+		axisStrokeColor:    opt.AxisStrokeColor,
+		axisSplitLineColor: opt.AxisSplitLineColor,
+		backgroundColor:    opt.BackgroundColor,
+		textColor:          opt.TextColor,
+		seriesColors:       opt.SeriesColors,
+	}
+}
+
+func NewTheme(name string) ColorPalette {
+	p, ok := palettes[name]
+	if !ok {
+		p = palettes[ThemeLight]
+	}
+	clone := *p
+	return &clone
+}
+
+func (t *themeColorPalette) IsDark() bool {
+	return t.isDarkMode
+}
+
+func (t *themeColorPalette) GetAxisStrokeColor() Color {
+	return t.axisStrokeColor
+}
+
+func (t *themeColorPalette) SetAxisStrokeColor(c Color) {
+	t.axisStrokeColor = c
+}
+
+func (t *themeColorPalette) GetAxisSplitLineColor() Color {
+	return t.axisSplitLineColor
+}
+
+func (t *themeColorPalette) SetAxisSplitLineColor(c Color) {
+	t.axisSplitLineColor = c
+}
+
+func (t *themeColorPalette) GetSeriesColor(index int) Color {
+	colors := t.seriesColors
+	return colors[index%len(colors)]
+}
+func (t *themeColorPalette) SetSeriesColor(colors []Color) {
+	t.seriesColors = colors
+}
+
+func (t *themeColorPalette) GetBackgroundColor() Color {
+	return t.backgroundColor
+}
+
+func (t *themeColorPalette) SetBackgroundColor(c Color) {
+	t.backgroundColor = c
+}
+
+func (t *themeColorPalette) GetTextColor() Color {
+	return t.textColor
+}
+
+func (t *themeColorPalette) SetTextColor(c Color) {
+	t.textColor = c
+}
+
+func (t *themeColorPalette) GetFontSize() float64 {
+	if t.fontSize != 0 {
+		return t.fontSize
+	}
+	return defaultFontSize
+}
+
+func (t *themeColorPalette) SetFontSize(fontSize float64) {
+	t.fontSize = fontSize
+}
+
+func (t *themeColorPalette) GetFont() *truetype.Font {
+	if t.font != nil {
+		return t.font
+	}
+	f, _ := GetDefaultFont()
+	return f
+}
+
+func (t *themeColorPalette) SetFont(f *truetype.Font) {
+	t.font = f
+}

title.go

@@ -0,0 +1,197 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/golang/freetype/truetype"
+)
+
+type TitleOption struct {
+	// The theme of chart
+	Theme ColorPalette
+	// Title text, support \n for new line
+	Text string
+	// Subtitle text, support \n for new line
+	Subtext string
+	// Distance between title component and the left side of the container.
+	// It can be pixel value: 20, percentage value: 20%,
+	// or position value: right, center.
+	Left string
+	// Distance between title component and the top side of the container.
+	// It can be pixel value: 20.
+	Top string
+	// The font of label
+	Font *truetype.Font
+	// The font size of label
+	FontSize float64
+	// The color of label
+	FontColor Color
+	// The subtext font size of label
+	SubtextFontSize float64
+	// The subtext font color of label
+	SubtextFontColor Color
+}
+
+type titleMeasureOption struct {
+	width  int
+	height int
+	text   string
+	style  Style
+}
+
+func splitTitleText(text string) []string {
+	arr := strings.Split(text, "\n")
+	result := make([]string, 0)
+	for _, v := range arr {
+		v = strings.TrimSpace(v)
+		if v == "" {
+			continue
+		}
+		result = append(result, v)
+	}
+	return result
+}
+
+type titlePainter struct {
+	p   *Painter
+	opt *TitleOption
+}
+
+// NewTitlePainter returns a title renderer
+func NewTitlePainter(p *Painter, opt TitleOption) *titlePainter {
+	return &titlePainter{
+		p:   p,
+		opt: &opt,
+	}
+}
+
+func (t *titlePainter) Render() (Box, error) {
+	opt := t.opt
+	p := t.p
+	theme := opt.Theme
+
+	if theme == nil {
+		theme = p.theme
+	}
+	if opt.Text == "" && opt.Subtext == "" {
+		return BoxZero, nil
+	}
+
+	measureOptions := make([]titleMeasureOption, 0)
+
+	if opt.Font == nil {
+		opt.Font = theme.GetFont()
+	}
+	if opt.FontColor.IsZero() {
+		opt.FontColor = theme.GetTextColor()
+	}
+	if opt.FontSize == 0 {
+		opt.FontSize = theme.GetFontSize()
+	}
+	if opt.SubtextFontColor.IsZero() {
+		opt.SubtextFontColor = opt.FontColor
+	}
+	if opt.SubtextFontSize == 0 {
+		opt.SubtextFontSize = opt.FontSize
+	}
+
+	titleTextStyle := Style{
+		Font:      opt.Font,
+		FontSize:  opt.FontSize,
+		FontColor: opt.FontColor,
+	}
+	// 主标题
+	for _, v := range splitTitleText(opt.Text) {
+		measureOptions = append(measureOptions, titleMeasureOption{
+			text:  v,
+			style: titleTextStyle,
+		})
+	}
+	subtextStyle := Style{
+		Font:      opt.Font,
+		FontSize:  opt.SubtextFontSize,
+		FontColor: opt.SubtextFontColor,
+	}
+	// 副标题
+	for _, v := range splitTitleText(opt.Subtext) {
+		measureOptions = append(measureOptions, titleMeasureOption{
+			text:  v,
+			style: subtextStyle,
+		})
+	}
+	textMaxWidth := 0
+	textMaxHeight := 0
+	for index, item := range measureOptions {
+		p.OverrideTextStyle(item.style)
+		textBox := p.MeasureText(item.text)
+
+		w := textBox.Width()
+		h := textBox.Height()
+		if w > textMaxWidth {
+			textMaxWidth = w
+		}
+		if h > textMaxHeight {
+			textMaxHeight = h
+		}
+		measureOptions[index].height = h
+		measureOptions[index].width = w
+	}
+	width := textMaxWidth
+
+	titleX := 0
+	switch opt.Left {
+	case PositionRight:
+		titleX = p.Width() - textMaxWidth
+	case PositionCenter:
+		titleX = p.Width()>>1 - (textMaxWidth >> 1)
+	default:
+		if strings.HasSuffix(opt.Left, "%") {
+			value, _ := strconv.Atoi(strings.ReplaceAll(opt.Left, "%", ""))
+			titleX = p.Width() * value / 100
+		} else {
+			value, _ := strconv.Atoi(opt.Left)
+			titleX = value
+		}
+	}
+	titleY := 0
+	// TODO TOP 暂只支持数值
+	if opt.Top != "" {
+		value, _ := strconv.Atoi(opt.Top)
+		titleY += value
+	}
+	for _, item := range measureOptions {
+		p.OverrideTextStyle(item.style)
+		x := titleX + (textMaxWidth-item.width)>>1
+		y := titleY + item.height
+		p.Text(item.text, x, y)
+		titleY += item.height
+	}
+
+	return Box{
+		Bottom: titleY,
+		Right:  titleX + width,
+	}, nil
+}

title_test.go

@@ -0,0 +1,93 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestTitleRenderer(t *testing.T) {
+	assert := assert.New(t)
+	tests := []struct {
+		render func(*Painter) ([]byte, error)
+		result string
+	}{
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewTitlePainter(p, TitleOption{
+					Text:    "title",
+					Subtext: "subTitle",
+					Left:    "20",
+					Top:     "20",
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<text x=\"34\" y=\"35\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">title</text><text x=\"20\" y=\"50\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">subTitle</text></svg>",
+		},
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewTitlePainter(p, TitleOption{
+					Text:    "title",
+					Subtext: "subTitle",
+					Left:    "20%",
+					Top:     "20",
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<text x=\"134\" y=\"35\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">title</text><text x=\"120\" y=\"50\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">subTitle</text></svg>",
+		},
+		{
+			render: func(p *Painter) ([]byte, error) {
+				_, err := NewTitlePainter(p, TitleOption{
+					Text:    "title",
+					Subtext: "subTitle",
+					Left:    PositionRight,
+				}).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<text x=\"558\" y=\"15\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">title</text><text x=\"544\" y=\"30\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">subTitle</text></svg>",
+		},
+	}
+	for _, tt := range tests {
+		p, err := NewPainter(PainterOptions{
+			Type:   ChartOutputSVG,
+			Width:  600,
+			Height: 400,
+		}, PainterThemeOption(defaultTheme))
+		assert.Nil(err)
+		data, err := tt.render(p)
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}

util.go

@@ -0,0 +1,271 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"math"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/dustin/go-humanize"
+	"git.smarteching.com/zeni/go-chart/v2"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+func TrueFlag() *bool {
+	t := true
+	return &t
+}
+
+func FalseFlag() *bool {
+	f := false
+	return &f
+}
+
+func containsInt(values []int, value int) bool {
+	for _, v := range values {
+		if v == value {
+			return true
+		}
+	}
+	return false
+}
+
+func containsString(values []string, value string) bool {
+	for _, v := range values {
+		if v == value {
+			return true
+		}
+	}
+	return false
+}
+
+func ceilFloatToInt(value float64) int {
+	i := int(value)
+	if value == float64(i) {
+		return i
+	}
+	return i + 1
+}
+
+func getDefaultInt(value, defaultValue int) int {
+	if value == 0 {
+		return defaultValue
+	}
+	return value
+}
+
+func autoDivide(max, size int) []int {
+	unit := float64(max) / float64(size)
+
+	values := make([]int, size+1)
+	for i := 0; i < size+1; i++ {
+		if i == size {
+			values[i] = max
+		} else {
+			values[i] = int(float64(i) * unit)
+		}
+	}
+	return values
+}
+
+func autoDivideSpans(max, size int, spans []int) []int {
+	values := autoDivide(max, size)
+	// 重新合并
+	if len(spans) != 0 {
+		newValues := make([]int, len(spans)+1)
+		newValues[0] = 0
+		end := 0
+		for index, v := range spans {
+			end += v
+			newValues[index+1] = values[end]
+		}
+		values = newValues
+	}
+	return values
+}
+
+func sumInt(values []int) int {
+	sum := 0
+	for _, v := range values {
+		sum += v
+	}
+	return sum
+}
+
+// measureTextMaxWidthHeight returns maxWidth and maxHeight of text list
+func measureTextMaxWidthHeight(textList []string, p *Painter) (int, int) {
+	maxWidth := 0
+	maxHeight := 0
+	for _, text := range textList {
+		box := p.MeasureText(text)
+		maxWidth = chart.MaxInt(maxWidth, box.Width())
+		maxHeight = chart.MaxInt(maxHeight, box.Height())
+	}
+	return maxWidth, maxHeight
+}
+
+func reverseStringSlice(stringList []string) {
+	for i, j := 0, len(stringList)-1; i < j; i, j = i+1, j-1 {
+		stringList[i], stringList[j] = stringList[j], stringList[i]
+	}
+}
+
+func reverseIntSlice(intList []int) {
+	for i, j := 0, len(intList)-1; i < j; i, j = i+1, j-1 {
+		intList[i], intList[j] = intList[j], intList[i]
+	}
+}
+
+func convertPercent(value string) float64 {
+	if !strings.HasSuffix(value, "%") {
+		return -1
+	}
+	v, err := strconv.Atoi(strings.ReplaceAll(value, "%", ""))
+	if err != nil {
+		return -1
+	}
+	return float64(v) / 100
+}
+
+func isFalse(flag *bool) bool {
+	if flag != nil && !*flag {
+		return true
+	}
+	return false
+}
+
+func NewFloatPoint(f float64) *float64 {
+	v := f
+	return &v
+}
+
+const K_VALUE = float64(1000)
+const M_VALUE = K_VALUE * K_VALUE
+const G_VALUE = M_VALUE * K_VALUE
+const T_VALUE = G_VALUE * K_VALUE
+
+func commafWithDigits(value float64) string {
+	decimals := 2
+	if value >= T_VALUE {
+		return humanize.CommafWithDigits(value/T_VALUE, decimals) + "T"
+	}
+	if value >= G_VALUE {
+		return humanize.CommafWithDigits(value/G_VALUE, decimals) + "G"
+	}
+	if value >= M_VALUE {
+		return humanize.CommafWithDigits(value/M_VALUE, decimals) + "M"
+	}
+	if value >= K_VALUE {
+		return humanize.CommafWithDigits(value/K_VALUE, decimals) + "k"
+	}
+	return humanize.CommafWithDigits(value, decimals)
+}
+
+func parseColor(color string) Color {
+	c := Color{}
+	if color == "" {
+		return c
+	}
+	if strings.HasPrefix(color, "#") {
+		return drawing.ColorFromHex(color[1:])
+	}
+	reg := regexp.MustCompile(`\((\S+)\)`)
+	result := reg.FindAllStringSubmatch(color, 1)
+	if len(result) == 0 || len(result[0]) != 2 {
+		return c
+	}
+	arr := strings.Split(result[0][1], ",")
+	if len(arr) < 3 {
+		return c
+	}
+	// 设置默认为255
+	c.A = 255
+	for index, v := range arr {
+		value, _ := strconv.Atoi(strings.TrimSpace(v))
+		ui8 := uint8(value)
+		switch index {
+		case 0:
+			c.R = ui8
+		case 1:
+			c.G = ui8
+		case 2:
+			c.B = ui8
+		default:
+			c.A = ui8
+		}
+	}
+	return c
+}
+
+const defaultRadiusPercent = 0.4
+
+func getRadius(diameter float64, radiusValue string) float64 {
+	var radius float64
+	if len(radiusValue) != 0 {
+		v := convertPercent(radiusValue)
+		if v != -1 {
+			radius = float64(diameter) * v
+		} else {
+			radius, _ = strconv.ParseFloat(radiusValue, 64)
+		}
+	}
+	if radius <= 0 {
+		radius = float64(diameter) * defaultRadiusPercent
+	}
+	return radius
+}
+
+func getPolygonPointAngles(sides int) []float64 {
+	angles := make([]float64, sides)
+	for i := 0; i < sides; i++ {
+		angle := 2*math.Pi/float64(sides)*float64(i) - (math.Pi / 2)
+		angles[i] = angle
+	}
+	return angles
+}
+
+func getPolygonPoint(center Point, radius, angle float64) Point {
+	x := center.X + int(radius*math.Cos(angle))
+	y := center.Y + int(radius*math.Sin(angle))
+	return Point{
+		X: x,
+		Y: y,
+	}
+}
+
+func getPolygonPoints(center Point, radius float64, sides int) []Point {
+	points := make([]Point, sides)
+	for i, angle := range getPolygonPointAngles(sides) {
+		points[i] = getPolygonPoint(center, radius, angle)
+	}
+	return points
+}
+
+func isLightColor(c Color) bool {
+	r := float64(c.R) * float64(c.R) * 0.299
+	g := float64(c.G) * float64(c.G) * 0.587
+	b := float64(c.B) * float64(c.B) * 0.114
+	return math.Sqrt(r+g+b) > 127.5
+}

util_test.go

@@ -0,0 +1,223 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"git.smarteching.com/zeni/go-chart/v2"
+	"git.smarteching.com/zeni/go-chart/v2/drawing"
+)
+
+func TestGetDefaultInt(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal(1, getDefaultInt(0, 1))
+	assert.Equal(10, getDefaultInt(10, 1))
+}
+
+func TestCeilFloatToInt(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal(1, ceilFloatToInt(0.8))
+	assert.Equal(1, ceilFloatToInt(1.0))
+	assert.Equal(2, ceilFloatToInt(1.2))
+}
+
+func TestCommafWithDigits(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal("1.2", commafWithDigits(1.2))
+	assert.Equal("1.21", commafWithDigits(1.21231))
+
+	assert.Equal("1.20k", commafWithDigits(1200.121))
+	assert.Equal("1.20M", commafWithDigits(1200000.121))
+}
+
+func TestAutoDivide(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal([]int{
+		0,
+		85,
+		171,
+		257,
+		342,
+		428,
+		514,
+		600,
+	}, autoDivide(600, 7))
+}
+
+func TestGetRadius(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal(50.0, getRadius(100, "50%"))
+	assert.Equal(30.0, getRadius(100, "30"))
+	assert.Equal(40.0, getRadius(100, ""))
+}
+
+func TestMeasureTextMaxWidthHeight(t *testing.T) {
+	assert := assert.New(t)
+	p, err := NewPainter(PainterOptions{
+		Width:  400,
+		Height: 300,
+	})
+	assert.Nil(err)
+	style := chart.Style{
+		FontSize: 10,
+	}
+	p.SetStyle(style)
+
+	maxWidth, maxHeight := measureTextMaxWidthHeight([]string{
+		"Mon",
+		"Tue",
+		"Wed",
+		"Thu",
+		"Fri",
+		"Sat",
+		"Sun",
+	}, p)
+	assert.Equal(31, maxWidth)
+	assert.Equal(12, maxHeight)
+}
+
+func TestReverseSlice(t *testing.T) {
+	assert := assert.New(t)
+
+	arr := []string{
+		"Mon",
+		"Tue",
+		"Wed",
+		"Thu",
+		"Fri",
+		"Sat",
+		"Sun",
+	}
+	reverseStringSlice(arr)
+	assert.Equal([]string{
+		"Sun",
+		"Sat",
+		"Fri",
+		"Thu",
+		"Wed",
+		"Tue",
+		"Mon",
+	}, arr)
+
+	numbers := []int{
+		1,
+		3,
+		5,
+		7,
+		9,
+	}
+	reverseIntSlice(numbers)
+	assert.Equal([]int{
+		9,
+		7,
+		5,
+		3,
+		1,
+	}, numbers)
+}
+
+func TestConvertPercent(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal(-1.0, convertPercent("1"))
+	assert.Equal(-1.0, convertPercent("a%"))
+	assert.Equal(0.1, convertPercent("10%"))
+}
+
+func TestParseColor(t *testing.T) {
+	assert := assert.New(t)
+
+	c := parseColor("")
+	assert.True(c.IsZero())
+
+	c = parseColor("#333")
+	assert.Equal(drawing.Color{
+		R: 51,
+		G: 51,
+		B: 51,
+		A: 255,
+	}, c)
+
+	c = parseColor("#313233")
+	assert.Equal(drawing.Color{
+		R: 49,
+		G: 50,
+		B: 51,
+		A: 255,
+	}, c)
+
+	c = parseColor("rgb(31,32,33)")
+	assert.Equal(drawing.Color{
+		R: 31,
+		G: 32,
+		B: 33,
+		A: 255,
+	}, c)
+
+	c = parseColor("rgba(50,51,52,250)")
+	assert.Equal(drawing.Color{
+		R: 50,
+		G: 51,
+		B: 52,
+		A: 250,
+	}, c)
+}
+
+func TestIsLightColor(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.True(isLightColor(drawing.Color{
+		R: 255,
+		G: 255,
+		B: 255,
+	}))
+	assert.True(isLightColor(drawing.Color{
+		R: 145,
+		G: 204,
+		B: 117,
+	}))
+
+	assert.False(isLightColor(drawing.Color{
+		R: 88,
+		G: 112,
+		B: 198,
+	}))
+
+	assert.False(isLightColor(drawing.Color{
+		R: 0,
+		G: 0,
+		B: 0,
+	}))
+	assert.False(isLightColor(drawing.Color{
+		R: 16,
+		G: 12,
+		B: 42,
+	}))
+}

web/index.css

@@ -1,71 +0,0 @@
-body {
-    font-family: BlinkMacSystemFont,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
-    height: 100vh;
-    background-color: #242424;
-}
-.header {
-    height: 60px;
-    line-height: 60px;
-    color: #fff; 
-    font-size: 16px;
-    background-color: #383838;
-    text-indent: 2em;
-}
-.header span {
-    margin-left: 50px;
-    margin-right: 5px;
-}
-.codeWrapper {
-    position: fixed;
-    left: 0;
-    right: 50%;
-    top: 60px;
-    bottom: 50px;
-    background-color: #d6dbe3;
-}
-.previewWrapper {
-    position: fixed;
-    left: 50%;
-    right: 0;
-    top: 60px;
-    bottom: 50px;
-}
-.optionTips {
-    position: absolute;
-    top: 3px;
-    right: 10px;
-}
-.previewTips {
-    position: absolute;
-    top: 3px;
-    left: 10px;
-    color: #fff;
-}
-.run {
-    display: block;
-    position: fixed;
-    left: 0;
-    right: 0;
-    bottom: 0; 
-    height: 50px;
-    line-height: 50px;
-    background-color: #0052D9;
-    color: #fff;
-    text-align: center;
-    font-size: 16px;
-    text-decoration: none;
-}
-.run:active, .run:visited {
-    color: #fff;
-}
-#svg {
-    position: absolute;
-    left: 0;
-    right: 0;
-    top: 50%;
-    margin-top: -200px;
-}
-#svg svg, #svg img {
-    display: block;
-    margin: auto;
-}

web/index.html

@@ -1,42 +0,0 @@
-<!doctype html>
-<html lang=zh>
-<head>
-    <link rel="stylesheet" type="text/css" href="https://cdn.staticfile.org/normalize/0/normalize.min.css" />
-    <link rel="stylesheet" type="text/css" href="https://cdn.staticfile.org/codemirror/2.33.0/codemirror.css" />
-    <link rel="stylesheet" type="text/css" href="/static/index.css" />
-
-    <script>
-        var _hmt = _hmt || [];
-        (function() {
-          var hm = document.createElement("script");
-          hm.src = "https://hm.baidu.com/hm.js?57f9ba58196c7a5eb5ca761b27817bbd";
-          var s = document.getElementsByTagName("script")[0]; 
-          s.parentNode.insertBefore(hm, s);
-        })();
-    </script>
-    <script src="https://cdn.staticfile.org/codemirror/2.33.0/codemirror.js"></script>
-    <script src="https://cdn.staticfile.org/axios/0.1.0/axios.min.js"></script>
-    <script src="/static/javascript.js"></script>
-</head>
-
-<body>
-    <div class="header">Go Charts
-        <span>选择图表输出格式：</span>
-        <select id="outputType">
-            <option value="svg">SVG</option>
-            <option value="png">PNG</option>
-        </select>
-    </div>
-    <div class="codeWrapper">
-        <textarea id="codeInput"></textarea>
-        <div class="optionTips">ECharts配置</div>
-    </div>
-    <div class="previewWrapper">
-        <div id="svg"></div>
-        <div class="previewTips">图表SVG效果</div>
-    </div>
-    <a href="#" class="run" onclick="run()">运行</a>
-</body>
-<script src="/static/index.js"></script>
-
-</html>

web/index.js

@@ -1,50 +0,0 @@
-var height = document.body.clientHeight- 110;
-var editor = CodeMirror.fromTextArea(document.getElementById("codeInput"), {
-    lineNumbers: true,
-    lineWrapping: true,
-    mode: "javascript"
-});
-editor.setSize("100%", height);
-editor.setValue(`option = {
-    xAxis: {
-      type: 'category',
-      data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
-    },
-    yAxis: {
-      type: 'value'
-    },
-    series: [
-      {
-        data: [150, 230, 224, 218, 135, 147, 260],
-        type: 'line'
-      }
-    ]
-};`);
-
-function run() {
-    var option = editor.getValue();
-    var data = null;
-    try {
-        if (option.indexOf("option = ") !== -1) {
-            var fn = new Function("var " + option + ";return option;");
-            data = fn();
-        } else {
-            data = JSON.parse(option);
-        }
-    } catch (err) {
-        alert(err.message);
-        return;
-    }
-    var dom = document.getElementById("outputType")
-    var outputType = dom.value;
-
-    axios.post("/?outputType=" + outputType, data).then(function(resp) {
-        if (outputType == "png") {
-            document.getElementById("svg").innerHTML = '<img src="data:image/png;base64,' + resp + '" />';
-        } else {
-            document.getElementById("svg").innerHTML = resp;
-        }
-    }).catch(function(err) {
-        alert(err.message);
-    });
-}

web/javascript.js

@@ -1,959 +0,0 @@
-// CodeMirror, copyright (c) by Marijn Haverbeke and others
-// Distributed under an MIT license: https://codemirror.net/LICENSE
-
-(function(mod) {
-    if (typeof exports == "object" && typeof module == "object") // CommonJS
-      mod(require("../../lib/codemirror"));
-    else if (typeof define == "function" && define.amd) // AMD
-      define(["../../lib/codemirror"], mod);
-    else // Plain browser env
-      mod(CodeMirror);
-  })(function(CodeMirror) {
-  "use strict";
-  
-  CodeMirror.defineMode("javascript", function(config, parserConfig) {
-    var indentUnit = config.indentUnit;
-    var statementIndent = parserConfig.statementIndent;
-    var jsonldMode = parserConfig.jsonld;
-    var jsonMode = parserConfig.json || jsonldMode;
-    var trackScope = parserConfig.trackScope !== false
-    var isTS = parserConfig.typescript;
-    var wordRE = parserConfig.wordCharacters || /[\w$\xa1-\uffff]/;
-  
-    // Tokenizer
-  
-    var keywords = function(){
-      function kw(type) {return {type: type, style: "keyword"};}
-      var A = kw("keyword a"), B = kw("keyword b"), C = kw("keyword c"), D = kw("keyword d");
-      var operator = kw("operator"), atom = {type: "atom", style: "atom"};
-  
-      return {
-        "if": kw("if"), "while": A, "with": A, "else": B, "do": B, "try": B, "finally": B,
-        "return": D, "break": D, "continue": D, "new": kw("new"), "delete": C, "void": C, "throw": C,
-        "debugger": kw("debugger"), "var": kw("var"), "const": kw("var"), "let": kw("var"),
-        "function": kw("function"), "catch": kw("catch"),
-        "for": kw("for"), "switch": kw("switch"), "case": kw("case"), "default": kw("default"),
-        "in": operator, "typeof": operator, "instanceof": operator,
-        "true": atom, "false": atom, "null": atom, "undefined": atom, "NaN": atom, "Infinity": atom,
-        "this": kw("this"), "class": kw("class"), "super": kw("atom"),
-        "yield": C, "export": kw("export"), "import": kw("import"), "extends": C,
-        "await": C
-      };
-    }();
-  
-    var isOperatorChar = /[+\-*&%=<>!?|~^@]/;
-    var isJsonldKeyword = /^@(context|id|value|language|type|container|list|set|reverse|index|base|vocab|graph)"/;
-  
-    function readRegexp(stream) {
-      var escaped = false, next, inSet = false;
-      while ((next = stream.next()) != null) {
-        if (!escaped) {
-          if (next == "/" && !inSet) return;
-          if (next == "[") inSet = true;
-          else if (inSet && next == "]") inSet = false;
-        }
-        escaped = !escaped && next == "\\";
-      }
-    }
-  
-    // Used as scratch variables to communicate multiple values without
-    // consing up tons of objects.
-    var type, content;
-    function ret(tp, style, cont) {
-      type = tp; content = cont;
-      return style;
-    }
-    function tokenBase(stream, state) {
-      var ch = stream.next();
-      if (ch == '"' || ch == "'") {
-        state.tokenize = tokenString(ch);
-        return state.tokenize(stream, state);
-      } else if (ch == "." && stream.match(/^\d[\d_]*(?:[eE][+\-]?[\d_]+)?/)) {
-        return ret("number", "number");
-      } else if (ch == "." && stream.match("..")) {
-        return ret("spread", "meta");
-      } else if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
-        return ret(ch);
-      } else if (ch == "=" && stream.eat(">")) {
-        return ret("=>", "operator");
-      } else if (ch == "0" && stream.match(/^(?:x[\dA-Fa-f_]+|o[0-7_]+|b[01_]+)n?/)) {
-        return ret("number", "number");
-      } else if (/\d/.test(ch)) {
-        stream.match(/^[\d_]*(?:n|(?:\.[\d_]*)?(?:[eE][+\-]?[\d_]+)?)?/);
-        return ret("number", "number");
-      } else if (ch == "/") {
-        if (stream.eat("*")) {
-          state.tokenize = tokenComment;
-          return tokenComment(stream, state);
-        } else if (stream.eat("/")) {
-          stream.skipToEnd();
-          return ret("comment", "comment");
-        } else if (expressionAllowed(stream, state, 1)) {
-          readRegexp(stream);
-          stream.match(/^\b(([gimyus])(?![gimyus]*\2))+\b/);
-          return ret("regexp", "string-2");
-        } else {
-          stream.eat("=");
-          return ret("operator", "operator", stream.current());
-        }
-      } else if (ch == "`") {
-        state.tokenize = tokenQuasi;
-        return tokenQuasi(stream, state);
-      } else if (ch == "#" && stream.peek() == "!") {
-        stream.skipToEnd();
-        return ret("meta", "meta");
-      } else if (ch == "#" && stream.eatWhile(wordRE)) {
-        return ret("variable", "property")
-      } else if (ch == "<" && stream.match("!--") ||
-                 (ch == "-" && stream.match("->") && !/\S/.test(stream.string.slice(0, stream.start)))) {
-        stream.skipToEnd()
-        return ret("comment", "comment")
-      } else if (isOperatorChar.test(ch)) {
-        if (ch != ">" || !state.lexical || state.lexical.type != ">") {
-          if (stream.eat("=")) {
-            if (ch == "!" || ch == "=") stream.eat("=")
-          } else if (/[<>*+\-|&?]/.test(ch)) {
-            stream.eat(ch)
-            if (ch == ">") stream.eat(ch)
-          }
-        }
-        if (ch == "?" && stream.eat(".")) return ret(".")
-        return ret("operator", "operator", stream.current());
-      } else if (wordRE.test(ch)) {
-        stream.eatWhile(wordRE);
-        var word = stream.current()
-        if (state.lastType != ".") {
-          if (keywords.propertyIsEnumerable(word)) {
-            var kw = keywords[word]
-            return ret(kw.type, kw.style, word)
-          }
-          if (word == "async" && stream.match(/^(\s|\/\*([^*]|\*(?!\/))*?\*\/)*[\[\(\w]/, false))
-            return ret("async", "keyword", word)
-        }
-        return ret("variable", "variable", word)
-      }
-    }
-  
-    function tokenString(quote) {
-      return function(stream, state) {
-        var escaped = false, next;
-        if (jsonldMode && stream.peek() == "@" && stream.match(isJsonldKeyword)){
-          state.tokenize = tokenBase;
-          return ret("jsonld-keyword", "meta");
-        }
-        while ((next = stream.next()) != null) {
-          if (next == quote && !escaped) break;
-          escaped = !escaped && next == "\\";
-        }
-        if (!escaped) state.tokenize = tokenBase;
-        return ret("string", "string");
-      };
-    }
-  
-    function tokenComment(stream, state) {
-      var maybeEnd = false, ch;
-      while (ch = stream.next()) {
-        if (ch == "/" && maybeEnd) {
-          state.tokenize = tokenBase;
-          break;
-        }
-        maybeEnd = (ch == "*");
-      }
-      return ret("comment", "comment");
-    }
-  
-    function tokenQuasi(stream, state) {
-      var escaped = false, next;
-      while ((next = stream.next()) != null) {
-        if (!escaped && (next == "`" || next == "$" && stream.eat("{"))) {
-          state.tokenize = tokenBase;
-          break;
-        }
-        escaped = !escaped && next == "\\";
-      }
-      return ret("quasi", "string-2", stream.current());
-    }
-  
-    var brackets = "([{}])";
-    // This is a crude lookahead trick to try and notice that we're
-    // parsing the argument patterns for a fat-arrow function before we
-    // actually hit the arrow token. It only works if the arrow is on
-    // the same line as the arguments and there's no strange noise
-    // (comments) in between. Fallback is to only notice when we hit the
-    // arrow, and not declare the arguments as locals for the arrow
-    // body.
-    function findFatArrow(stream, state) {
-      if (state.fatArrowAt) state.fatArrowAt = null;
-      var arrow = stream.string.indexOf("=>", stream.start);
-      if (arrow < 0) return;
-  
-      if (isTS) { // Try to skip TypeScript return type declarations after the arguments
-        var m = /:\s*(?:\w+(?:<[^>]*>|\[\])?|\{[^}]*\})\s*$/.exec(stream.string.slice(stream.start, arrow))
-        if (m) arrow = m.index
-      }
-  
-      var depth = 0, sawSomething = false;
-      for (var pos = arrow - 1; pos >= 0; --pos) {
-        var ch = stream.string.charAt(pos);
-        var bracket = brackets.indexOf(ch);
-        if (bracket >= 0 && bracket < 3) {
-          if (!depth) { ++pos; break; }
-          if (--depth == 0) { if (ch == "(") sawSomething = true; break; }
-        } else if (bracket >= 3 && bracket < 6) {
-          ++depth;
-        } else if (wordRE.test(ch)) {
-          sawSomething = true;
-        } else if (/["'\/`]/.test(ch)) {
-          for (;; --pos) {
-            if (pos == 0) return
-            var next = stream.string.charAt(pos - 1)
-            if (next == ch && stream.string.charAt(pos - 2) != "\\") { pos--; break }
-          }
-        } else if (sawSomething && !depth) {
-          ++pos;
-          break;
-        }
-      }
-      if (sawSomething && !depth) state.fatArrowAt = pos;
-    }
-  
-    // Parser
-  
-    var atomicTypes = {"atom": true, "number": true, "variable": true, "string": true,
-                       "regexp": true, "this": true, "import": true, "jsonld-keyword": true};
-  
-    function JSLexical(indented, column, type, align, prev, info) {
-      this.indented = indented;
-      this.column = column;
-      this.type = type;
-      this.prev = prev;
-      this.info = info;
-      if (align != null) this.align = align;
-    }
-  
-    function inScope(state, varname) {
-      if (!trackScope) return false
-      for (var v = state.localVars; v; v = v.next)
-        if (v.name == varname) return true;
-      for (var cx = state.context; cx; cx = cx.prev) {
-        for (var v = cx.vars; v; v = v.next)
-          if (v.name == varname) return true;
-      }
-    }
-  
-    function parseJS(state, style, type, content, stream) {
-      var cc = state.cc;
-      // Communicate our context to the combinators.
-      // (Less wasteful than consing up a hundred closures on every call.)
-      cx.state = state; cx.stream = stream; cx.marked = null, cx.cc = cc; cx.style = style;
-  
-      if (!state.lexical.hasOwnProperty("align"))
-        state.lexical.align = true;
-  
-      while(true) {
-        var combinator = cc.length ? cc.pop() : jsonMode ? expression : statement;
-        if (combinator(type, content)) {
-          while(cc.length && cc[cc.length - 1].lex)
-            cc.pop()();
-          if (cx.marked) return cx.marked;
-          if (type == "variable" && inScope(state, content)) return "variable-2";
-          return style;
-        }
-      }
-    }
-  
-    // Combinator utils
-  
-    var cx = {state: null, column: null, marked: null, cc: null};
-    function pass() {
-      for (var i = arguments.length - 1; i >= 0; i--) cx.cc.push(arguments[i]);
-    }
-    function cont() {
-      pass.apply(null, arguments);
-      return true;
-    }
-    function inList(name, list) {
-      for (var v = list; v; v = v.next) if (v.name == name) return true
-      return false;
-    }
-    function register(varname) {
-      var state = cx.state;
-      cx.marked = "def";
-      if (!trackScope) return
-      if (state.context) {
-        if (state.lexical.info == "var" && state.context && state.context.block) {
-          // FIXME function decls are also not block scoped
-          var newContext = registerVarScoped(varname, state.context)
-          if (newContext != null) {
-            state.context = newContext
-            return
-          }
-        } else if (!inList(varname, state.localVars)) {
-          state.localVars = new Var(varname, state.localVars)
-          return
-        }
-      }
-      // Fall through means this is global
-      if (parserConfig.globalVars && !inList(varname, state.globalVars))
-        state.globalVars = new Var(varname, state.globalVars)
-    }
-    function registerVarScoped(varname, context) {
-      if (!context) {
-        return null
-      } else if (context.block) {
-        var inner = registerVarScoped(varname, context.prev)
-        if (!inner) return null
-        if (inner == context.prev) return context
-        return new Context(inner, context.vars, true)
-      } else if (inList(varname, context.vars)) {
-        return context
-      } else {
-        return new Context(context.prev, new Var(varname, context.vars), false)
-      }
-    }
-  
-    function isModifier(name) {
-      return name == "public" || name == "private" || name == "protected" || name == "abstract" || name == "readonly"
-    }
-  
-    // Combinators
-  
-    function Context(prev, vars, block) { this.prev = prev; this.vars = vars; this.block = block }
-    function Var(name, next) { this.name = name; this.next = next }
-  
-    var defaultVars = new Var("this", new Var("arguments", null))
-    function pushcontext() {
-      cx.state.context = new Context(cx.state.context, cx.state.localVars, false)
-      cx.state.localVars = defaultVars
-    }
-    function pushblockcontext() {
-      cx.state.context = new Context(cx.state.context, cx.state.localVars, true)
-      cx.state.localVars = null
-    }
-    function popcontext() {
-      cx.state.localVars = cx.state.context.vars
-      cx.state.context = cx.state.context.prev
-    }
-    popcontext.lex = true
-    function pushlex(type, info) {
-      var result = function() {
-        var state = cx.state, indent = state.indented;
-        if (state.lexical.type == "stat") indent = state.lexical.indented;
-        else for (var outer = state.lexical; outer && outer.type == ")" && outer.align; outer = outer.prev)
-          indent = outer.indented;
-        state.lexical = new JSLexical(indent, cx.stream.column(), type, null, state.lexical, info);
-      };
-      result.lex = true;
-      return result;
-    }
-    function poplex() {
-      var state = cx.state;
-      if (state.lexical.prev) {
-        if (state.lexical.type == ")")
-          state.indented = state.lexical.indented;
-        state.lexical = state.lexical.prev;
-      }
-    }
-    poplex.lex = true;
-  
-    function expect(wanted) {
-      function exp(type) {
-        if (type == wanted) return cont();
-        else if (wanted == ";" || type == "}" || type == ")" || type == "]") return pass();
-        else return cont(exp);
-      };
-      return exp;
-    }
-  
-    function statement(type, value) {
-      if (type == "var") return cont(pushlex("vardef", value), vardef, expect(";"), poplex);
-      if (type == "keyword a") return cont(pushlex("form"), parenExpr, statement, poplex);
-      if (type == "keyword b") return cont(pushlex("form"), statement, poplex);
-      if (type == "keyword d") return cx.stream.match(/^\s*$/, false) ? cont() : cont(pushlex("stat"), maybeexpression, expect(";"), poplex);
-      if (type == "debugger") return cont(expect(";"));
-      if (type == "{") return cont(pushlex("}"), pushblockcontext, block, poplex, popcontext);
-      if (type == ";") return cont();
-      if (type == "if") {
-        if (cx.state.lexical.info == "else" && cx.state.cc[cx.state.cc.length - 1] == poplex)
-          cx.state.cc.pop()();
-        return cont(pushlex("form"), parenExpr, statement, poplex, maybeelse);
-      }
-      if (type == "function") return cont(functiondef);
-      if (type == "for") return cont(pushlex("form"), pushblockcontext, forspec, statement, popcontext, poplex);
-      if (type == "class" || (isTS && value == "interface")) {
-        cx.marked = "keyword"
-        return cont(pushlex("form", type == "class" ? type : value), className, poplex)
-      }
-      if (type == "variable") {
-        if (isTS && value == "declare") {
-          cx.marked = "keyword"
-          return cont(statement)
-        } else if (isTS && (value == "module" || value == "enum" || value == "type") && cx.stream.match(/^\s*\w/, false)) {
-          cx.marked = "keyword"
-          if (value == "enum") return cont(enumdef);
-          else if (value == "type") return cont(typename, expect("operator"), typeexpr, expect(";"));
-          else return cont(pushlex("form"), pattern, expect("{"), pushlex("}"), block, poplex, poplex)
-        } else if (isTS && value == "namespace") {
-          cx.marked = "keyword"
-          return cont(pushlex("form"), expression, statement, poplex)
-        } else if (isTS && value == "abstract") {
-          cx.marked = "keyword"
-          return cont(statement)
-        } else {
-          return cont(pushlex("stat"), maybelabel);
-        }
-      }
-      if (type == "switch") return cont(pushlex("form"), parenExpr, expect("{"), pushlex("}", "switch"), pushblockcontext,
-                                        block, poplex, poplex, popcontext);
-      if (type == "case") return cont(expression, expect(":"));
-      if (type == "default") return cont(expect(":"));
-      if (type == "catch") return cont(pushlex("form"), pushcontext, maybeCatchBinding, statement, poplex, popcontext);
-      if (type == "export") return cont(pushlex("stat"), afterExport, poplex);
-      if (type == "import") return cont(pushlex("stat"), afterImport, poplex);
-      if (type == "async") return cont(statement)
-      if (value == "@") return cont(expression, statement)
-      return pass(pushlex("stat"), expression, expect(";"), poplex);
-    }
-    function maybeCatchBinding(type) {
-      if (type == "(") return cont(funarg, expect(")"))
-    }
-    function expression(type, value) {
-      return expressionInner(type, value, false);
-    }
-    function expressionNoComma(type, value) {
-      return expressionInner(type, value, true);
-    }
-    function parenExpr(type) {
-      if (type != "(") return pass()
-      return cont(pushlex(")"), maybeexpression, expect(")"), poplex)
-    }
-    function expressionInner(type, value, noComma) {
-      if (cx.state.fatArrowAt == cx.stream.start) {
-        var body = noComma ? arrowBodyNoComma : arrowBody;
-        if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, expect("=>"), body, popcontext);
-        else if (type == "variable") return pass(pushcontext, pattern, expect("=>"), body, popcontext);
-      }
-  
-      var maybeop = noComma ? maybeoperatorNoComma : maybeoperatorComma;
-      if (atomicTypes.hasOwnProperty(type)) return cont(maybeop);
-      if (type == "function") return cont(functiondef, maybeop);
-      if (type == "class" || (isTS && value == "interface")) { cx.marked = "keyword"; return cont(pushlex("form"), classExpression, poplex); }
-      if (type == "keyword c" || type == "async") return cont(noComma ? expressionNoComma : expression);
-      if (type == "(") return cont(pushlex(")"), maybeexpression, expect(")"), poplex, maybeop);
-      if (type == "operator" || type == "spread") return cont(noComma ? expressionNoComma : expression);
-      if (type == "[") return cont(pushlex("]"), arrayLiteral, poplex, maybeop);
-      if (type == "{") return contCommasep(objprop, "}", null, maybeop);
-      if (type == "quasi") return pass(quasi, maybeop);
-      if (type == "new") return cont(maybeTarget(noComma));
-      return cont();
-    }
-    function maybeexpression(type) {
-      if (type.match(/[;\}\)\],]/)) return pass();
-      return pass(expression);
-    }
-  
-    function maybeoperatorComma(type, value) {
-      if (type == ",") return cont(maybeexpression);
-      return maybeoperatorNoComma(type, value, false);
-    }
-    function maybeoperatorNoComma(type, value, noComma) {
-      var me = noComma == false ? maybeoperatorComma : maybeoperatorNoComma;
-      var expr = noComma == false ? expression : expressionNoComma;
-      if (type == "=>") return cont(pushcontext, noComma ? arrowBodyNoComma : arrowBody, popcontext);
-      if (type == "operator") {
-        if (/\+\+|--/.test(value) || isTS && value == "!") return cont(me);
-        if (isTS && value == "<" && cx.stream.match(/^([^<>]|<[^<>]*>)*>\s*\(/, false))
-          return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, me);
-        if (value == "?") return cont(expression, expect(":"), expr);
-        return cont(expr);
-      }
-      if (type == "quasi") { return pass(quasi, me); }
-      if (type == ";") return;
-      if (type == "(") return contCommasep(expressionNoComma, ")", "call", me);
-      if (type == ".") return cont(property, me);
-      if (type == "[") return cont(pushlex("]"), maybeexpression, expect("]"), poplex, me);
-      if (isTS && value == "as") { cx.marked = "keyword"; return cont(typeexpr, me) }
-      if (type == "regexp") {
-        cx.state.lastType = cx.marked = "operator"
-        cx.stream.backUp(cx.stream.pos - cx.stream.start - 1)
-        return cont(expr)
-      }
-    }
-    function quasi(type, value) {
-      if (type != "quasi") return pass();
-      if (value.slice(value.length - 2) != "${") return cont(quasi);
-      return cont(maybeexpression, continueQuasi);
-    }
-    function continueQuasi(type) {
-      if (type == "}") {
-        cx.marked = "string-2";
-        cx.state.tokenize = tokenQuasi;
-        return cont(quasi);
-      }
-    }
-    function arrowBody(type) {
-      findFatArrow(cx.stream, cx.state);
-      return pass(type == "{" ? statement : expression);
-    }
-    function arrowBodyNoComma(type) {
-      findFatArrow(cx.stream, cx.state);
-      return pass(type == "{" ? statement : expressionNoComma);
-    }
-    function maybeTarget(noComma) {
-      return function(type) {
-        if (type == ".") return cont(noComma ? targetNoComma : target);
-        else if (type == "variable" && isTS) return cont(maybeTypeArgs, noComma ? maybeoperatorNoComma : maybeoperatorComma)
-        else return pass(noComma ? expressionNoComma : expression);
-      };
-    }
-    function target(_, value) {
-      if (value == "target") { cx.marked = "keyword"; return cont(maybeoperatorComma); }
-    }
-    function targetNoComma(_, value) {
-      if (value == "target") { cx.marked = "keyword"; return cont(maybeoperatorNoComma); }
-    }
-    function maybelabel(type) {
-      if (type == ":") return cont(poplex, statement);
-      return pass(maybeoperatorComma, expect(";"), poplex);
-    }
-    function property(type) {
-      if (type == "variable") {cx.marked = "property"; return cont();}
-    }
-    function objprop(type, value) {
-      if (type == "async") {
-        cx.marked = "property";
-        return cont(objprop);
-      } else if (type == "variable" || cx.style == "keyword") {
-        cx.marked = "property";
-        if (value == "get" || value == "set") return cont(getterSetter);
-        var m // Work around fat-arrow-detection complication for detecting typescript typed arrow params
-        if (isTS && cx.state.fatArrowAt == cx.stream.start && (m = cx.stream.match(/^\s*:\s*/, false)))
-          cx.state.fatArrowAt = cx.stream.pos + m[0].length
-        return cont(afterprop);
-      } else if (type == "number" || type == "string") {
-        cx.marked = jsonldMode ? "property" : (cx.style + " property");
-        return cont(afterprop);
-      } else if (type == "jsonld-keyword") {
-        return cont(afterprop);
-      } else if (isTS && isModifier(value)) {
-        cx.marked = "keyword"
-        return cont(objprop)
-      } else if (type == "[") {
-        return cont(expression, maybetype, expect("]"), afterprop);
-      } else if (type == "spread") {
-        return cont(expressionNoComma, afterprop);
-      } else if (value == "*") {
-        cx.marked = "keyword";
-        return cont(objprop);
-      } else if (type == ":") {
-        return pass(afterprop)
-      }
-    }
-    function getterSetter(type) {
-      if (type != "variable") return pass(afterprop);
-      cx.marked = "property";
-      return cont(functiondef);
-    }
-    function afterprop(type) {
-      if (type == ":") return cont(expressionNoComma);
-      if (type == "(") return pass(functiondef);
-    }
-    function commasep(what, end, sep) {
-      function proceed(type, value) {
-        if (sep ? sep.indexOf(type) > -1 : type == ",") {
-          var lex = cx.state.lexical;
-          if (lex.info == "call") lex.pos = (lex.pos || 0) + 1;
-          return cont(function(type, value) {
-            if (type == end || value == end) return pass()
-            return pass(what)
-          }, proceed);
-        }
-        if (type == end || value == end) return cont();
-        if (sep && sep.indexOf(";") > -1) return pass(what)
-        return cont(expect(end));
-      }
-      return function(type, value) {
-        if (type == end || value == end) return cont();
-        return pass(what, proceed);
-      };
-    }
-    function contCommasep(what, end, info) {
-      for (var i = 3; i < arguments.length; i++)
-        cx.cc.push(arguments[i]);
-      return cont(pushlex(end, info), commasep(what, end), poplex);
-    }
-    function block(type) {
-      if (type == "}") return cont();
-      return pass(statement, block);
-    }
-    function maybetype(type, value) {
-      if (isTS) {
-        if (type == ":") return cont(typeexpr);
-        if (value == "?") return cont(maybetype);
-      }
-    }
-    function maybetypeOrIn(type, value) {
-      if (isTS && (type == ":" || value == "in")) return cont(typeexpr)
-    }
-    function mayberettype(type) {
-      if (isTS && type == ":") {
-        if (cx.stream.match(/^\s*\w+\s+is\b/, false)) return cont(expression, isKW, typeexpr)
-        else return cont(typeexpr)
-      }
-    }
-    function isKW(_, value) {
-      if (value == "is") {
-        cx.marked = "keyword"
-        return cont()
-      }
-    }
-    function typeexpr(type, value) {
-      if (value == "keyof" || value == "typeof" || value == "infer" || value == "readonly") {
-        cx.marked = "keyword"
-        return cont(value == "typeof" ? expressionNoComma : typeexpr)
-      }
-      if (type == "variable" || value == "void") {
-        cx.marked = "type"
-        return cont(afterType)
-      }
-      if (value == "|" || value == "&") return cont(typeexpr)
-      if (type == "string" || type == "number" || type == "atom") return cont(afterType);
-      if (type == "[") return cont(pushlex("]"), commasep(typeexpr, "]", ","), poplex, afterType)
-      if (type == "{") return cont(pushlex("}"), typeprops, poplex, afterType)
-      if (type == "(") return cont(commasep(typearg, ")"), maybeReturnType, afterType)
-      if (type == "<") return cont(commasep(typeexpr, ">"), typeexpr)
-      if (type == "quasi") { return pass(quasiType, afterType); }
-    }
-    function maybeReturnType(type) {
-      if (type == "=>") return cont(typeexpr)
-    }
-    function typeprops(type) {
-      if (type.match(/[\}\)\]]/)) return cont()
-      if (type == "," || type == ";") return cont(typeprops)
-      return pass(typeprop, typeprops)
-    }
-    function typeprop(type, value) {
-      if (type == "variable" || cx.style == "keyword") {
-        cx.marked = "property"
-        return cont(typeprop)
-      } else if (value == "?" || type == "number" || type == "string") {
-        return cont(typeprop)
-      } else if (type == ":") {
-        return cont(typeexpr)
-      } else if (type == "[") {
-        return cont(expect("variable"), maybetypeOrIn, expect("]"), typeprop)
-      } else if (type == "(") {
-        return pass(functiondecl, typeprop)
-      } else if (!type.match(/[;\}\)\],]/)) {
-        return cont()
-      }
-    }
-    function quasiType(type, value) {
-      if (type != "quasi") return pass();
-      if (value.slice(value.length - 2) != "${") return cont(quasiType);
-      return cont(typeexpr, continueQuasiType);
-    }
-    function continueQuasiType(type) {
-      if (type == "}") {
-        cx.marked = "string-2";
-        cx.state.tokenize = tokenQuasi;
-        return cont(quasiType);
-      }
-    }
-    function typearg(type, value) {
-      if (type == "variable" && cx.stream.match(/^\s*[?:]/, false) || value == "?") return cont(typearg)
-      if (type == ":") return cont(typeexpr)
-      if (type == "spread") return cont(typearg)
-      return pass(typeexpr)
-    }
-    function afterType(type, value) {
-      if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, afterType)
-      if (value == "|" || type == "." || value == "&") return cont(typeexpr)
-      if (type == "[") return cont(typeexpr, expect("]"), afterType)
-      if (value == "extends" || value == "implements") { cx.marked = "keyword"; return cont(typeexpr) }
-      if (value == "?") return cont(typeexpr, expect(":"), typeexpr)
-    }
-    function maybeTypeArgs(_, value) {
-      if (value == "<") return cont(pushlex(">"), commasep(typeexpr, ">"), poplex, afterType)
-    }
-    function typeparam() {
-      return pass(typeexpr, maybeTypeDefault)
-    }
-    function maybeTypeDefault(_, value) {
-      if (value == "=") return cont(typeexpr)
-    }
-    function vardef(_, value) {
-      if (value == "enum") {cx.marked = "keyword"; return cont(enumdef)}
-      return pass(pattern, maybetype, maybeAssign, vardefCont);
-    }
-    function pattern(type, value) {
-      if (isTS && isModifier(value)) { cx.marked = "keyword"; return cont(pattern) }
-      if (type == "variable") { register(value); return cont(); }
-      if (type == "spread") return cont(pattern);
-      if (type == "[") return contCommasep(eltpattern, "]");
-      if (type == "{") return contCommasep(proppattern, "}");
-    }
-    function proppattern(type, value) {
-      if (type == "variable" && !cx.stream.match(/^\s*:/, false)) {
-        register(value);
-        return cont(maybeAssign);
-      }
-      if (type == "variable") cx.marked = "property";
-      if (type == "spread") return cont(pattern);
-      if (type == "}") return pass();
-      if (type == "[") return cont(expression, expect(']'), expect(':'), proppattern);
-      return cont(expect(":"), pattern, maybeAssign);
-    }
-    function eltpattern() {
-      return pass(pattern, maybeAssign)
-    }
-    function maybeAssign(_type, value) {
-      if (value == "=") return cont(expressionNoComma);
-    }
-    function vardefCont(type) {
-      if (type == ",") return cont(vardef);
-    }
-    function maybeelse(type, value) {
-      if (type == "keyword b" && value == "else") return cont(pushlex("form", "else"), statement, poplex);
-    }
-    function forspec(type, value) {
-      if (value == "await") return cont(forspec);
-      if (type == "(") return cont(pushlex(")"), forspec1, poplex);
-    }
-    function forspec1(type) {
-      if (type == "var") return cont(vardef, forspec2);
-      if (type == "variable") return cont(forspec2);
-      return pass(forspec2)
-    }
-    function forspec2(type, value) {
-      if (type == ")") return cont()
-      if (type == ";") return cont(forspec2)
-      if (value == "in" || value == "of") { cx.marked = "keyword"; return cont(expression, forspec2) }
-      return pass(expression, forspec2)
-    }
-    function functiondef(type, value) {
-      if (value == "*") {cx.marked = "keyword"; return cont(functiondef);}
-      if (type == "variable") {register(value); return cont(functiondef);}
-      if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, mayberettype, statement, popcontext);
-      if (isTS && value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, functiondef)
-    }
-    function functiondecl(type, value) {
-      if (value == "*") {cx.marked = "keyword"; return cont(functiondecl);}
-      if (type == "variable") {register(value); return cont(functiondecl);}
-      if (type == "(") return cont(pushcontext, pushlex(")"), commasep(funarg, ")"), poplex, mayberettype, popcontext);
-      if (isTS && value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, functiondecl)
-    }
-    function typename(type, value) {
-      if (type == "keyword" || type == "variable") {
-        cx.marked = "type"
-        return cont(typename)
-      } else if (value == "<") {
-        return cont(pushlex(">"), commasep(typeparam, ">"), poplex)
-      }
-    }
-    function funarg(type, value) {
-      if (value == "@") cont(expression, funarg)
-      if (type == "spread") return cont(funarg);
-      if (isTS && isModifier(value)) { cx.marked = "keyword"; return cont(funarg); }
-      if (isTS && type == "this") return cont(maybetype, maybeAssign)
-      return pass(pattern, maybetype, maybeAssign);
-    }
-    function classExpression(type, value) {
-      // Class expressions may have an optional name.
-      if (type == "variable") return className(type, value);
-      return classNameAfter(type, value);
-    }
-    function className(type, value) {
-      if (type == "variable") {register(value); return cont(classNameAfter);}
-    }
-    function classNameAfter(type, value) {
-      if (value == "<") return cont(pushlex(">"), commasep(typeparam, ">"), poplex, classNameAfter)
-      if (value == "extends" || value == "implements" || (isTS && type == ",")) {
-        if (value == "implements") cx.marked = "keyword";
-        return cont(isTS ? typeexpr : expression, classNameAfter);
-      }
-      if (type == "{") return cont(pushlex("}"), classBody, poplex);
-    }
-    function classBody(type, value) {
-      if (type == "async" ||
-          (type == "variable" &&
-           (value == "static" || value == "get" || value == "set" || (isTS && isModifier(value))) &&
-           cx.stream.match(/^\s+[\w$\xa1-\uffff]/, false))) {
-        cx.marked = "keyword";
-        return cont(classBody);
-      }
-      if (type == "variable" || cx.style == "keyword") {
-        cx.marked = "property";
-        return cont(classfield, classBody);
-      }
-      if (type == "number" || type == "string") return cont(classfield, classBody);
-      if (type == "[")
-        return cont(expression, maybetype, expect("]"), classfield, classBody)
-      if (value == "*") {
-        cx.marked = "keyword";
-        return cont(classBody);
-      }
-      if (isTS && type == "(") return pass(functiondecl, classBody)
-      if (type == ";" || type == ",") return cont(classBody);
-      if (type == "}") return cont();
-      if (value == "@") return cont(expression, classBody)
-    }
-    function classfield(type, value) {
-      if (value == "!") return cont(classfield)
-      if (value == "?") return cont(classfield)
-      if (type == ":") return cont(typeexpr, maybeAssign)
-      if (value == "=") return cont(expressionNoComma)
-      var context = cx.state.lexical.prev, isInterface = context && context.info == "interface"
-      return pass(isInterface ? functiondecl : functiondef)
-    }
-    function afterExport(type, value) {
-      if (value == "*") { cx.marked = "keyword"; return cont(maybeFrom, expect(";")); }
-      if (value == "default") { cx.marked = "keyword"; return cont(expression, expect(";")); }
-      if (type == "{") return cont(commasep(exportField, "}"), maybeFrom, expect(";"));
-      return pass(statement);
-    }
-    function exportField(type, value) {
-      if (value == "as") { cx.marked = "keyword"; return cont(expect("variable")); }
-      if (type == "variable") return pass(expressionNoComma, exportField);
-    }
-    function afterImport(type) {
-      if (type == "string") return cont();
-      if (type == "(") return pass(expression);
-      if (type == ".") return pass(maybeoperatorComma);
-      return pass(importSpec, maybeMoreImports, maybeFrom);
-    }
-    function importSpec(type, value) {
-      if (type == "{") return contCommasep(importSpec, "}");
-      if (type == "variable") register(value);
-      if (value == "*") cx.marked = "keyword";
-      return cont(maybeAs);
-    }
-    function maybeMoreImports(type) {
-      if (type == ",") return cont(importSpec, maybeMoreImports)
-    }
-    function maybeAs(_type, value) {
-      if (value == "as") { cx.marked = "keyword"; return cont(importSpec); }
-    }
-    function maybeFrom(_type, value) {
-      if (value == "from") { cx.marked = "keyword"; return cont(expression); }
-    }
-    function arrayLiteral(type) {
-      if (type == "]") return cont();
-      return pass(commasep(expressionNoComma, "]"));
-    }
-    function enumdef() {
-      return pass(pushlex("form"), pattern, expect("{"), pushlex("}"), commasep(enummember, "}"), poplex, poplex)
-    }
-    function enummember() {
-      return pass(pattern, maybeAssign);
-    }
-  
-    function isContinuedStatement(state, textAfter) {
-      return state.lastType == "operator" || state.lastType == "," ||
-        isOperatorChar.test(textAfter.charAt(0)) ||
-        /[,.]/.test(textAfter.charAt(0));
-    }
-  
-    function expressionAllowed(stream, state, backUp) {
-      return state.tokenize == tokenBase &&
-        /^(?:operator|sof|keyword [bcd]|case|new|export|default|spread|[\[{}\(,;:]|=>)$/.test(state.lastType) ||
-        (state.lastType == "quasi" && /\{\s*$/.test(stream.string.slice(0, stream.pos - (backUp || 0))))
-    }
-  
-    // Interface
-  
-    return {
-      startState: function(basecolumn) {
-        var state = {
-          tokenize: tokenBase,
-          lastType: "sof",
-          cc: [],
-          lexical: new JSLexical((basecolumn || 0) - indentUnit, 0, "block", false),
-          localVars: parserConfig.localVars,
-          context: parserConfig.localVars && new Context(null, null, false),
-          indented: basecolumn || 0
-        };
-        if (parserConfig.globalVars && typeof parserConfig.globalVars == "object")
-          state.globalVars = parserConfig.globalVars;
-        return state;
-      },
-  
-      token: function(stream, state) {
-        if (stream.sol()) {
-          if (!state.lexical.hasOwnProperty("align"))
-            state.lexical.align = false;
-          state.indented = stream.indentation();
-          findFatArrow(stream, state);
-        }
-        if (state.tokenize != tokenComment && stream.eatSpace()) return null;
-        var style = state.tokenize(stream, state);
-        if (type == "comment") return style;
-        state.lastType = type == "operator" && (content == "++" || content == "--") ? "incdec" : type;
-        return parseJS(state, style, type, content, stream);
-      },
-  
-      indent: function(state, textAfter) {
-        if (state.tokenize == tokenComment || state.tokenize == tokenQuasi) return CodeMirror.Pass;
-        if (state.tokenize != tokenBase) return 0;
-        var firstChar = textAfter && textAfter.charAt(0), lexical = state.lexical, top
-        // Kludge to prevent 'maybelse' from blocking lexical scope pops
-        if (!/^\s*else\b/.test(textAfter)) for (var i = state.cc.length - 1; i >= 0; --i) {
-          var c = state.cc[i];
-          if (c == poplex) lexical = lexical.prev;
-          else if (c != maybeelse && c != popcontext) break;
-        }
-        while ((lexical.type == "stat" || lexical.type == "form") &&
-               (firstChar == "}" || ((top = state.cc[state.cc.length - 1]) &&
-                                     (top == maybeoperatorComma || top == maybeoperatorNoComma) &&
-                                     !/^[,\.=+\-*:?[\(]/.test(textAfter))))
-          lexical = lexical.prev;
-        if (statementIndent && lexical.type == ")" && lexical.prev.type == "stat")
-          lexical = lexical.prev;
-        var type = lexical.type, closing = firstChar == type;
-  
-        if (type == "vardef") return lexical.indented + (state.lastType == "operator" || state.lastType == "," ? lexical.info.length + 1 : 0);
-        else if (type == "form" && firstChar == "{") return lexical.indented;
-        else if (type == "form") return lexical.indented + indentUnit;
-        else if (type == "stat")
-          return lexical.indented + (isContinuedStatement(state, textAfter) ? statementIndent || indentUnit : 0);
-        else if (lexical.info == "switch" && !closing && parserConfig.doubleIndentSwitch != false)
-          return lexical.indented + (/^(?:case|default)\b/.test(textAfter) ? indentUnit : 2 * indentUnit);
-        else if (lexical.align) return lexical.column + (closing ? 0 : 1);
-        else return lexical.indented + (closing ? 0 : indentUnit);
-      },
-  
-      electricInput: /^\s*(?:case .*?:|default:|\{|\})$/,
-      blockCommentStart: jsonMode ? null : "/*",
-      blockCommentEnd: jsonMode ? null : "*/",
-      blockCommentContinue: jsonMode ? null : " * ",
-      lineComment: jsonMode ? null : "//",
-      fold: "brace",
-      closeBrackets: "()[]{}''\"\"``",
-  
-      helperType: jsonMode ? "json" : "javascript",
-      jsonldMode: jsonldMode,
-      jsonMode: jsonMode,
-  
-      expressionAllowed: expressionAllowed,
-  
-      skipExpression: function(state) {
-        parseJS(state, "atom", "atom", "true", new CodeMirror.StringStream("", 2, null))
-      }
-    };
-  });
-  
-//   CodeMirror.registerHelper("wordChars", "javascript", /[\w$]/);
-  
-  CodeMirror.defineMIME("text/javascript", "javascript");
-  CodeMirror.defineMIME("text/ecmascript", "javascript");
-  CodeMirror.defineMIME("application/javascript", "javascript");
-  CodeMirror.defineMIME("application/x-javascript", "javascript");
-  CodeMirror.defineMIME("application/ecmascript", "javascript");
-  CodeMirror.defineMIME("application/json", { name: "javascript", json: true });
-  CodeMirror.defineMIME("application/x-json", { name: "javascript", json: true });
-  CodeMirror.defineMIME("application/manifest+json", { name: "javascript", json: true })
-  CodeMirror.defineMIME("application/ld+json", { name: "javascript", jsonld: true });
-  CodeMirror.defineMIME("text/typescript", { name: "javascript", typescript: true });
-  CodeMirror.defineMIME("application/typescript", { name: "javascript", typescript: true });
-  
-  });

xaxis.go

@@ -0,0 +1,105 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"github.com/golang/freetype/truetype"
+)
+
+type XAxisOption struct {
+	// The font of x axis
+	Font *truetype.Font
+	// The boundary gap on both sides of a coordinate axis.
+	// Nil or *true means the center part of two axis ticks
+	BoundaryGap *bool
+	// The data value of x axis
+	Data []string
+	// The theme of chart
+	Theme ColorPalette
+	// The font size of x axis label
+	FontSize float64
+	// The flag for show axis, set this to *false will hide axis
+	Show *bool
+	// Number of segments that the axis is split into. Note that this number serves only as a recommendation.
+	SplitNumber int
+	// The position of axis, it can be 'top' or 'bottom'
+	Position string
+	// The line color of axis
+	StrokeColor Color
+	// The color of label
+	FontColor Color
+	// The text rotation of label
+	TextRotation float64
+	// The first axis
+	FirstAxis int
+	// The offset of label
+	LabelOffset Box
+	isValueAxis bool
+}
+
+const defaultXAxisHeight = 30
+
+// NewXAxisOption returns a x axis option
+func NewXAxisOption(data []string, boundaryGap ...*bool) XAxisOption {
+	opt := XAxisOption{
+		Data: data,
+	}
+	if len(boundaryGap) != 0 {
+		opt.BoundaryGap = boundaryGap[0]
+	}
+	return opt
+}
+
+func (opt *XAxisOption) ToAxisOption() AxisOption {
+	position := PositionBottom
+	if opt.Position == PositionTop {
+		position = PositionTop
+	}
+	axisOpt := AxisOption{
+		Theme:          opt.Theme,
+		Data:           opt.Data,
+		BoundaryGap:    opt.BoundaryGap,
+		Position:       position,
+		SplitNumber:    opt.SplitNumber,
+		StrokeColor:    opt.StrokeColor,
+		FontSize:       opt.FontSize,
+		Font:           opt.Font,
+		FontColor:      opt.FontColor,
+		Show:           opt.Show,
+		SplitLineColor: opt.Theme.GetAxisSplitLineColor(),
+		TextRotation:   opt.TextRotation,
+		LabelOffset:    opt.LabelOffset,
+		FirstAxis:      opt.FirstAxis,
+	}
+	if opt.isValueAxis {
+		axisOpt.SplitLineShow = true
+		axisOpt.StrokeWidth = -1
+		axisOpt.BoundaryGap = FalseFlag()
+	}
+	return axisOpt
+}
+
+// NewBottomXAxis returns a bottom x axis renderer
+func NewBottomXAxis(p *Painter, opt XAxisOption) *axisPainter {
+	return NewAxisPainter(p, opt.ToAxisOption())
+}

yaxis.go

@@ -0,0 +1,128 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import "github.com/golang/freetype/truetype"
+
+type YAxisOption struct {
+	// The minimun value of axis.
+	Min *float64
+	// The maximum value of axis.
+	Max *float64
+	// The font of y axis
+	Font *truetype.Font
+	// The data value of x axis
+	Data []string
+	// The theme of chart
+	Theme ColorPalette
+	// The font size of x axis label
+	FontSize float64
+	// The position of axis, it can be 'left' or 'right'
+	Position string
+	// The color of label
+	FontColor Color
+	// Formatter for y axis text value
+	Formatter string
+	// Color for y axis
+	Color Color
+	// The flag for show axis, set this to *false will hide axis
+	Show           *bool
+	DivideCount    int
+	Unit           int
+	isCategoryAxis bool
+	// The flag for show axis split line, set this to true will show axis split line
+	SplitLineShow *bool
+}
+
+// NewYAxisOptions returns a y axis option
+func NewYAxisOptions(data []string, others ...[]string) []YAxisOption {
+	arr := [][]string{
+		data,
+	}
+	arr = append(arr, others...)
+	opts := make([]YAxisOption, 0)
+	for _, data := range arr {
+		opts = append(opts, YAxisOption{
+			Data: data,
+		})
+	}
+	return opts
+}
+
+func (opt *YAxisOption) ToAxisOption(p *Painter) AxisOption {
+	position := PositionLeft
+	if opt.Position == PositionRight {
+		position = PositionRight
+	}
+	theme := opt.Theme
+	if theme == nil {
+		theme = p.theme
+	}
+	axisOpt := AxisOption{
+		Formatter:      opt.Formatter,
+		Theme:          theme,
+		Data:           opt.Data,
+		Position:       position,
+		FontSize:       opt.FontSize,
+		StrokeWidth:    -1,
+		Font:           opt.Font,
+		FontColor:      opt.FontColor,
+		BoundaryGap:    FalseFlag(),
+		SplitLineShow:  true,
+		SplitLineColor: theme.GetAxisSplitLineColor(),
+		Show:           opt.Show,
+		Unit:           opt.Unit,
+	}
+	if !opt.Color.IsZero() {
+		axisOpt.FontColor = opt.Color
+		axisOpt.StrokeColor = opt.Color
+	}
+	if opt.isCategoryAxis {
+		axisOpt.BoundaryGap = TrueFlag()
+		axisOpt.StrokeWidth = 1
+		axisOpt.SplitLineShow = false
+	}
+	if opt.SplitLineShow != nil {
+		axisOpt.SplitLineShow = *opt.SplitLineShow
+	}
+	return axisOpt
+}
+
+// NewLeftYAxis returns a left y axis renderer
+func NewLeftYAxis(p *Painter, opt YAxisOption) *axisPainter {
+	p = p.Child(PainterPaddingOption(Box{
+		Bottom: defaultXAxisHeight,
+	}))
+	return NewAxisPainter(p, opt.ToAxisOption(p))
+}
+
+// NewRightYAxis returns a right y axis renderer
+func NewRightYAxis(p *Painter, opt YAxisOption) *axisPainter {
+	p = p.Child(PainterPaddingOption(Box{
+		Bottom: defaultXAxisHeight,
+	}))
+	axisOpt := opt.ToAxisOption(p)
+	axisOpt.Position = PositionRight
+	axisOpt.SplitLineShow = false
+	return NewAxisPainter(p, axisOpt)
+}

yaxis_test.go

@@ -0,0 +1,70 @@
+// MIT License
+
+// Copyright (c) 2022 Tree Xie
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package charts
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRightYAxis(t *testing.T) {
+	assert := assert.New(t)
+	tests := []struct {
+		render func(*Painter) ([]byte, error)
+		result string
+	}{
+		{
+			render: func(p *Painter) ([]byte, error) {
+				opt := NewYAxisOptions([]string{
+					"a",
+					"b",
+					"c",
+					"d",
+				})[0]
+				_, err := NewRightYAxis(p, opt).Render()
+				if err != nil {
+					return nil, err
+				}
+				return p.Bytes()
+			},
+			result: "<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" width=\"600\" height=\"400\">\\n<text x=\"581\" y=\"17\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">a</text><text x=\"581\" y=\"133\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">b</text><text x=\"581\" y=\"250\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">c</text><text x=\"581\" y=\"367\" style=\"stroke-width:0;stroke:none;fill:rgba(70,70,70,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif\">d</text></svg>",
+		},
+	}
+	for _, tt := range tests {
+		p, err := NewPainter(PainterOptions{
+			Type:   ChartOutputSVG,
+			Width:  600,
+			Height: 400,
+		}, PainterThemeOption(defaultTheme), PainterPaddingOption(Box{
+			Top:    10,
+			Right:  10,
+			Bottom: 10,
+			Left:   10,
+		}))
+		assert.Nil(err)
+		data, err := tt.render(p)
+		assert.Nil(err)
+		assert.Equal(tt.result, string(data))
+	}
+}