switching to generators

COVERAGE

@@ -1 +1 @@
-70.89
+29.02

Makefile

@@ -7,6 +7,9 @@ new-install:
 	@go get -v -u github.com/blend/go-sdk/cmd/coverage
 	@go get -v -u github.com/blend/go-sdk/cmd/profanity
 
+generate:
+	@go generate ./...
+
 test:
 	@go test ./...
 

README.md

@@ -2,12 +2,9 @@ go-chart
 ========
 [![CircleCI](https://circleci.com/gh/wcharczuk/go-chart.svg?style=svg)](https://circleci.com/gh/wcharczuk/go-chart) [![Go Report Card](https://goreportcard.com/badge/github.com/wcharczuk/go-chart)](https://goreportcard.com/report/github.com/wcharczuk/go-chart)
 
-Package `chart` is a very simple golang native charting library that supports timeseries and continuous
+Package `chart` is a very simple golang native charting library that supports timeseries and continuous line charts.
-line charts.
 
-The v1.0 release has been tagged so things should be more or less stable, if something changes please log an issue.
+Master should now be on the v3.x codebase, which overhauls the api significantly. Per usual, see `_examples` for more information.
-
-Master should now be on the v2.x codebase, which brings a couple new features and better handling of basics like axes labeling etc. Per usual, see `_examples` for more information.
 
 # Installation
 
@@ -83,8 +80,7 @@ Here, we have a single series with x range values as float64s, rendered to a PNG
 
 # API Overview
 
-Everything on the `chart.Chart` object has defaults that can be overriden. Whenever a developer sets a property on the chart object, it is to be assumed that value will be used instead of the default. One complication here
+Everything on the `chart.Chart` object has defaults that can be overriden. Whenever a developer sets a property on the chart object, it is to be assumed that value will be used instead of the default.
-is any object's root `chart.Style` object (i.e named `Style`) and the `Show` property specifically, if any other property is set and the `Show` property is unset, it is assumed to be it's default value of `False`.
 
 The best way to see the api in action is to look at the examples in the `./_examples/` directory.
 
@@ -96,4 +92,4 @@ The goal with the API itself is to have the "zero value be useful", and to requi
 
 # Contributions
 
-This library is super early but contributions are welcome.
+Contributions are welcome though this library is in a holding pattern for the forseable future.

_examples/bar_chart/main.go

@@ -1,57 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-	"net/http"
-	"os"
-
-	chart "github.com/wcharczuk/go-chart"
-)
-
-func drawChart(res http.ResponseWriter, req *http.Request) {
-	sbc := chart.BarChart{
-		Title:      "Test Bar Chart",
-		TitleStyle: chart.StyleShow(),
-		Background: chart.Style{
-			Padding: chart.Box{
-				Top: 40,
-			},
-		},
-		Height:   512,
-		BarWidth: 60,
-		XAxis:    chart.StyleShow(),
-		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
-		},
-		Bars: []chart.Value{
-			{Value: 5.25, Label: "Blue"},
-			{Value: 4.88, Label: "Green"},
-			{Value: 4.74, Label: "Gray"},
-			{Value: 3.22, Label: "Orange"},
-			{Value: 3, Label: "Test"},
-			{Value: 2.27, Label: "??"},
-			{Value: 1, Label: "!!"},
-		},
-	}
-
-	res.Header().Set("Content-Type", "image/png")
-	err := sbc.Render(chart.PNG, res)
-	if err != nil {
-		fmt.Printf("Error rendering chart: %v\n", err)
-	}
-}
-
-func port() string {
-	if len(os.Getenv("PORT")) > 0 {
-		return os.Getenv("PORT")
-	}
-	return "8080"
-}
-
-func main() {
-	listenPort := fmt.Sprintf(":%s", port())
-	fmt.Printf("Listening on %s\n", listenPort)
-	http.HandleFunc("/", drawChart)
-	log.Fatal(http.ListenAndServe(listenPort, nil))
-}

_examples/basic/main.go

@@ -1,43 +0,0 @@
-package main
-
-import (
-	"log"
-	"net/http"
-
-	chart "github.com/wcharczuk/go-chart"
-)
-
-func drawChart(res http.ResponseWriter, req *http.Request) {
-	graph := chart.Chart{
-		Series: []chart.Series{
-			chart.ContinuousSeries{
-				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
-				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
-			},
-		},
-	}
-
-	res.Header().Set("Content-Type", "image/png")
-	graph.Render(chart.PNG, res)
-}
-
-func drawChartWide(res http.ResponseWriter, req *http.Request) {
-	graph := chart.Chart{
-		Width: 1920, //this overrides the default.
-		Series: []chart.Series{
-			chart.ContinuousSeries{
-				XValues: []float64{1.0, 2.0, 3.0, 4.0},
-				YValues: []float64{1.0, 2.0, 3.0, 4.0},
-			},
-		},
-	}
-
-	res.Header().Set("Content-Type", "image/png")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.HandleFunc("/wide", drawChartWide)
-	log.Fatal(http.ListenAndServe(":8080", nil))
-}

_examples/benchmark_line_charts/main.go

@@ -1,79 +0,0 @@
-// Usage: http://localhost:8080?series=100&values=1000
-package main
-
-import (
-	"fmt"
-	"math/rand"
-	"net/http"
-	"strconv"
-	"time"
-
-	chart "github.com/wcharczuk/go-chart"
-)
-
-func random(min, max float64) float64 {
-	return rand.Float64()*(max-min) + min
-}
-
-func drawLargeChart(res http.ResponseWriter, r *http.Request) {
-	numSeriesInt64, err := strconv.ParseInt(r.FormValue("series"), 10, 64)
-	if err != nil {
-		numSeriesInt64 = int64(1)
-	}
-	if numSeriesInt64 == 0 {
-		numSeriesInt64 = 1
-	}
-	numSeries := int(numSeriesInt64)
-
-	numValuesInt64, err := strconv.ParseInt(r.FormValue("values"), 10, 64)
-	if err != nil {
-		numValuesInt64 = int64(100)
-	}
-	if numValuesInt64 == 0 {
-		numValuesInt64 = int64(100)
-	}
-	numValues := int(numValuesInt64)
-
-	series := make([]chart.Series, numSeries)
-
-	for i := 0; i < numSeries; i++ {
-		xValues := make([]time.Time, numValues)
-		yValues := make([]float64, numValues)
-
-		for j := 0; j < numValues; j++ {
-			xValues[j] = time.Now().AddDate(0, 0, (numValues-j)*-1)
-			yValues[j] = random(float64(-500), float64(500))
-		}
-
-		series[i] = chart.TimeSeries{
-			Name:    fmt.Sprintf("aaa.bbb.hostname-%v.ccc.ddd.eee.fff.ggg.hhh.iii.jjj.kkk.lll.mmm.nnn.value", i),
-			XValues: xValues,
-			YValues: yValues,
-		}
-	}
-
-	graph := chart.Chart{
-		XAxis: chart.XAxis{
-			Name:      "Time",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
-		},
-		YAxis: chart.YAxis{
-			Name:      "Value",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
-		},
-		Series: series,
-	}
-
-	res.Header().Set("Content-Type", "image/png")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawLargeChart)
-	http.HandleFunc("/favico.ico", func(res http.ResponseWriter, req *http.Request) {
-		res.Write([]byte{})
-	})
-	http.ListenAndServe(":8080", nil)
-}

_examples/custom_padding/main.go

@@ -1,67 +0,0 @@
-package main
-
-import (
-	"net/http"
-
-	chart "github.com/wcharczuk/go-chart"
-	"github.com/wcharczuk/go-chart/drawing"
-	"github.com/wcharczuk/go-chart/seq"
-)
-
-func drawChart(res http.ResponseWriter, req *http.Request) {
-	graph := chart.Chart{
-		Background: chart.Style{
-			Padding: chart.Box{
-				Top:    50,
-				Left:   25,
-				Right:  25,
-				Bottom: 10,
-			},
-			FillColor: drawing.ColorFromHex("efefef"),
-		},
-		XAxis: chart.XAxis{
-			Style: chart.StyleShow(),
-		},
-		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
-		},
-		Series: []chart.Series{
-			chart.ContinuousSeries{
-				XValues: SeqRange(1.0, 100.0),
-				YValues: seq.RandomValuesWithMax(100, 512),
-			},
-		},
-	}
-
-	res.Header().Set("Content-Type", "image/png")
-	graph.Render(chart.PNG, res)
-}
-
-func drawChartDefault(res http.ResponseWriter, req *http.Request) {
-	graph := chart.Chart{
-		Background: chart.Style{
-			FillColor: drawing.ColorFromHex("efefef"),
-		},
-		XAxis: chart.XAxis{
-			Style: chart.StyleShow(),
-		},
-		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
-		},
-		Series: []chart.Series{
-			chart.ContinuousSeries{
-				XValues: SeqRange(1.0, 100.0),
-				YValues: seq.RandomValuesWithMax(100, 512),
-			},
-		},
-	}
-
-	res.Header().Set("Content-Type", "image/png")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.HandleFunc("/default", drawChartDefault)
-	http.ListenAndServe(":8080", nil)
-}

_examples/donut_chart/main.go

@@ -1,54 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-	"net/http"
-
-	"github.com/wcharczuk/go-chart"
-)
-
-func drawChart(res http.ResponseWriter, req *http.Request) {
-	pie := chart.DonutChart{
-		Width:  512,
-		Height: 512,
-		Values: []chart.Value{
-			{Value: 5, Label: "Blue"},
-			{Value: 5, Label: "Green"},
-			{Value: 4, Label: "Gray"},
-			{Value: 4, Label: "Orange"},
-			{Value: 3, Label: "Deep Blue"},
-			{Value: 3, Label: "test"},
-		},
-	}
-
-	res.Header().Set("Content-Type", "image/png")
-	err := pie.Render(chart.PNG, res)
-	if err != nil {
-		fmt.Printf("Error rendering pie chart: %v\n", err)
-	}
-}
-
-func drawChartRegression(res http.ResponseWriter, req *http.Request) {
-	pie := chart.DonutChart{
-		Width:  512,
-		Height: 512,
-		Values: []chart.Value{
-			{Value: 5, Label: "Blue"},
-			{Value: 2, Label: "Two"},
-			{Value: 1, Label: "One"},
-		},
-	}
-
-	res.Header().Set("Content-Type", chart.ContentTypeSVG)
-	err := pie.Render(chart.SVG, res)
-	if err != nil {
-		fmt.Printf("Error rendering pie chart: %v\n", err)
-	}
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.HandleFunc("/reg", drawChartRegression)
-	log.Fatal(http.ListenAndServe(":8080", nil))
-}

_examples/pie_chart/main.go

@@ -1,55 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-	"net/http"
-
-	chart "github.com/wcharczuk/go-chart"
-)
-
-func drawChart(res http.ResponseWriter, req *http.Request) {
-	pie := chart.PieChart{
-		Width:  512,
-		Height: 512,
-		Values: []chart.Value{
-			{Value: 5, Label: "Blue"},
-			{Value: 5, Label: "Green"},
-			{Value: 4, Label: "Gray"},
-			{Value: 4, Label: "Orange"},
-			{Value: 3, Label: "Deep Blue"},
-			{Value: 3, Label: "??"},
-			{Value: 1, Label: "!!"},
-		},
-	}
-
-	res.Header().Set("Content-Type", "image/png")
-	err := pie.Render(chart.PNG, res)
-	if err != nil {
-		fmt.Printf("Error rendering pie chart: %v\n", err)
-	}
-}
-
-func drawChartRegression(res http.ResponseWriter, req *http.Request) {
-	pie := chart.PieChart{
-		Width:  512,
-		Height: 512,
-		Values: []chart.Value{
-			{Value: 5, Label: "Blue"},
-			{Value: 2, Label: "Two"},
-			{Value: 1, Label: "One"},
-		},
-	}
-
-	res.Header().Set("Content-Type", chart.ContentTypeSVG)
-	err := pie.Render(chart.SVG, res)
-	if err != nil {
-		fmt.Printf("Error rendering pie chart: %v\n", err)
-	}
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.HandleFunc("/reg", drawChartRegression)
-	log.Fatal(http.ListenAndServe(":8080", nil))
-}

examples/annotations/main.go

@@ -1,13 +1,14 @@
 package main
 
+//go:generate go run main.go
+
 import (
-	"net/http"
+	"os"
 
 	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
-
 	/*
 	   In this example we add an `Annotation` series, which is a special type of series that
 	   draws annotation labels at given X and Y values (as translated by their respective ranges).
@@ -37,11 +38,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/axes/main.go

@@ -1,12 +1,14 @@
 package main
 
+//go:generate go run main.go
+
 import (
-	"net/http"
+	"os"
 
 	chart "github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 
 	/*
 	   The below will draw the same chart as the `basic` example, except with both the x and y axes turned on.
@@ -14,20 +16,9 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 	*/
 
 	graph := chart.Chart{
-		XAxis: chart.XAxis{
-			Name:      "The XAxis",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
-		},
-		YAxis: chart.YAxis{
-			Name:      "The YAxis",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
-		},
 		Series: []chart.Series{
 			chart.ContinuousSeries{
 				Style: chart.Style{
-					Show:        true,
 					StrokeColor: chart.GetDefaultColor(0).WithAlpha(64),
 					FillColor:   chart.GetDefaultColor(0).WithAlpha(64),
 				},
@@ -37,11 +28,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/axes_labels/main.go

@@ -1,12 +1,14 @@
 package main
 
+//go:generate go run main.go
+
 import (
-	"net/http"
+	"os"
 
 	chart "github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 
 	/*
 	   The below will draw the same chart as the `basic` example, except with both the x and y axes turned on.
@@ -15,15 +17,14 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style: chart.StyleShow(), //enables / displays the x-axis
+			Name: "The XAxis",
 		},
 		YAxis: chart.YAxis{
-			Style: chart.StyleShow(), //enables / displays the y-axis
+			Name: "The YAxis",
 		},
 		Series: []chart.Series{
 			chart.ContinuousSeries{
 				Style: chart.Style{
-					Show:        true,
 					StrokeColor: chart.GetDefaultColor(0).WithAlpha(64),
 					FillColor:   chart.GetDefaultColor(0).WithAlpha(64),
 				},
@@ -33,11 +34,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/bar_chart/main.go

@@ -0,0 +1,35 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+	graph := chart.BarChart{
+		Title: "Test Bar Chart",
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top: 40,
+			},
+		},
+		Height:   512,
+		BarWidth: 60,
+		Bars: []chart.Value{
+			{Value: 5.25, Label: "Blue"},
+			{Value: 4.88, Label: "Green"},
+			{Value: 4.74, Label: "Gray"},
+			{Value: 3.22, Label: "Orange"},
+			{Value: 3, Label: "Test"},
+			{Value: 2.27, Label: "??"},
+			{Value: 1, Label: "!!"},
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/bar_chart_base_value/main.go

@@ -1,33 +1,29 @@
 package main
 
+//go:generate go run main.go
+
 import (
-	"fmt"
-	"log"
-	"net/http"
 	"os"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 	"github.com/wcharczuk/go-chart/drawing"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 	profitStyle := chart.Style{
-		Show:        true,
 		FillColor:   drawing.ColorFromHex("13c158"),
 		StrokeColor: drawing.ColorFromHex("13c158"),
 		StrokeWidth: 0,
 	}
 
 	lossStyle := chart.Style{
-		Show:        true,
 		FillColor:   drawing.ColorFromHex("c11313"),
 		StrokeColor: drawing.ColorFromHex("c11313"),
 		StrokeWidth: 0,
 	}
 
 	sbc := chart.BarChart{
-		Title:      "Bar Chart Using BaseValue",
+		Title: "Bar Chart Using BaseValue",
-		TitleStyle: chart.StyleShow(),
 		Background: chart.Style{
 			Padding: chart.Box{
 				Top: 40,
@@ -35,13 +31,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 		Height:   512,
 		BarWidth: 60,
-		XAxis: chart.Style{
-			Show: true,
-		},
 		YAxis: chart.YAxis{
-			Style: chart.Style{
-				Show: true,
-			},
 			Ticks: []chart.Tick{
 				{Value: -4.0, Label: "-4"},
 				{Value: -2.0, Label: "-2"},
@@ -66,23 +56,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	err := sbc.Render(chart.PNG, res)
+	defer f.Close()
-	if err != nil {
+	sbc.Render(chart.PNG, f)
-		fmt.Printf("Error rendering chart: %v\n", err)
-	}
-}
-
-func port() string {
-	if len(os.Getenv("PORT")) > 0 {
-		return os.Getenv("PORT")
-	}
-	return "8080"
-}
-
-func main() {
-	listenPort := fmt.Sprintf(":%s", port())
-	fmt.Printf("Listening on %s\n", listenPort)
-	http.HandleFunc("/", drawChart)
-	log.Fatal(http.ListenAndServe(listenPort, nil))
 }

examples/basic/main.go

@@ -0,0 +1,23 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+	graph := chart.Chart{
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+		},
+	}
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/benchmark_line_charts/main.go

@@ -0,0 +1,52 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"fmt"
+	"math/rand"
+	"os"
+	"time"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func random(min, max float64) float64 {
+	return rand.Float64()*(max-min) + min
+}
+
+func main() {
+	numValues := 1024
+	numSeries := 100
+	series := make([]chart.Series, numSeries)
+
+	for i := 0; i < numSeries; i++ {
+		xValues := make([]time.Time, numValues)
+		yValues := make([]float64, numValues)
+
+		for j := 0; j < numValues; j++ {
+			xValues[j] = time.Now().AddDate(0, 0, (numValues-j)*-1)
+			yValues[j] = random(float64(-500), float64(500))
+		}
+
+		series[i] = chart.TimeSeries{
+			Name:    fmt.Sprintf("aaa.bbb.hostname-%v.ccc.ddd.eee.fff.ggg.hhh.iii.jjj.kkk.lll.mmm.nnn.value", i),
+			XValues: xValues,
+			YValues: yValues,
+		}
+	}
+
+	graph := chart.Chart{
+		XAxis: chart.XAxis{
+			Name: "Time",
+		},
+		YAxis: chart.YAxis{
+			Name: "Value",
+		},
+		Series: series,
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/css_classes/main.go

@@ -5,7 +5,7 @@ import (
 	"log"
 	"net/http"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 )
 
 // Note: Additional examples on how to add Stylesheets are in the custom_stylesheets example

examples/custom_formatters/main.go

@@ -1,13 +1,15 @@
 package main
 
+//go:generate go run main.go
+
 import (
 	"fmt"
-	"net/http"
+	"os"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 	/*
 	   In this example we use a custom `ValueFormatter` for the y axis, letting us specify how to format text of the y-axis ticks.
 	   You can also do this for the x-axis, or the secondary y-axis.
@@ -16,7 +18,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
 			ValueFormatter: func(v interface{}) string {
 				if vf, isFloat := v.(float64); isFloat {
 					return fmt.Sprintf("%0.6f", vf)
@@ -31,12 +32,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 			},
 		},
 	}
-
+	f, _ := os.Create("output.png")
-	res.Header().Set("Content-Type", "image/png")
+	defer f.Close()
-	graph.Render(chart.PNG, res)
+	graph.Render(chart.PNG, f)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/custom_padding/main.go

@@ -0,0 +1,34 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart/drawing"
+)
+
+func main() {
+	graph := chart.Chart{
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top:    50,
+				Left:   25,
+				Right:  25,
+				Bottom: 10,
+			},
+			FillColor: drawing.ColorFromHex("efefef"),
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(1.0).WithEnd(100.0)}.Values(),
+				YValues: chart.Seq{Sequence: chart.NewRandomSequence().WithLen(100).WithMin(100).WithMax(512)}.Values(),
+			},
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/custom_ranges/main.go

@@ -1,12 +1,14 @@
 package main
 
-import (
+//go:generate go run main.go
-	"net/http"
 
-	chart "github.com/wcharczuk/go-chart"
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 	/*
 	   In this example we set a custom range for the y-axis, overriding the automatic range generation.
 	   Note: the chart will still generate the ticks automatically based on the custom range, so the intervals may be a bit weird.
@@ -14,7 +16,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
 			Range: &chart.ContinuousRange{
 				Min: 0.0,
 				Max: 10.0,
@@ -27,12 +28,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 			},
 		},
 	}
-
+	f, _ := os.Create("output.png")
-	res.Header().Set("Content-Type", "image/png")
+	defer f.Close()
-	graph.Render(chart.PNG, res)
+	graph.Render(chart.PNG, f)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/custom_styles/main.go

@@ -1,13 +1,15 @@
 package main
 
-import (
+//go:generate go run main.go
-	"net/http"
 
-	chart "github.com/wcharczuk/go-chart"
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
 	"github.com/wcharczuk/go-chart/drawing"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 	/*
 	   In this example we set some custom colors for the series and the chart background and canvas.
 	*/
@@ -21,7 +23,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		Series: []chart.Series{
 			chart.ContinuousSeries{
 				Style: chart.Style{
-					Show:        true,                           //note; if we set ANY other properties, we must set this to true.
 					StrokeColor: drawing.ColorRed,               // will supercede defaults
 					FillColor:   drawing.ColorRed.WithAlpha(64), // will supercede defaults
 				},
@@ -31,11 +32,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/custom_ticks/main.go

@@ -1,12 +1,14 @@
 package main
 
-import (
+//go:generate go run main.go
-	"net/http"
 
-	chart "github.com/wcharczuk/go-chart"
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 	/*
 	   In this example we set a custom set of ticks to use for the y-axis. It can be (almost) whatever you want, including some custom labels for ticks.
 	   Custom ticks will supercede a custom range, which will supercede automatic generation based on series values.
@@ -14,7 +16,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
 			Range: &chart.ContinuousRange{
 				Min: 0.0,
 				Max: 4.0,
@@ -35,12 +36,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 			},
 		},
 	}
-
+	f, _ := os.Create("output.png")
-	res.Header().Set("Content-Type", "image/png")
+	defer f.Close()
-	graph.Render(chart.PNG, res)
+	graph.Render(chart.PNG, f)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/descending/main.go

@@ -1,12 +1,14 @@
 package main
 
+//go:generate go run main.go
+
 import (
-	"net/http"
+	"os"
 
 	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 
 	/*
 	   The below will draw the same chart as the `basic` example, except with both the x and y axes turned on.
@@ -19,14 +21,12 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 	graph := chart.Chart{
 		Height: 500,
 		Width:  500,
-		XAxis: chart.XAxis{
+		XAxis:  chart.XAxis{
-			Style: chart.StyleShow(),
 			/*Range: &chart.ContinuousRange{
 				Descending: true,
 			},*/
 		},
 		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
 			Range: &chart.ContinuousRange{
 				Descending: true,
 			},
@@ -34,7 +34,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		Series: []chart.Series{
 			chart.ContinuousSeries{
 				Style: chart.Style{
-					Show:        true,
 					StrokeColor: chart.GetDefaultColor(0).WithAlpha(64),
 					FillColor:   chart.GetDefaultColor(0).WithAlpha(64),
 				},
@@ -44,11 +43,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/donut_chart/main.go

@@ -0,0 +1,28 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+	pie := chart.DonutChart{
+		Width:  512,
+		Height: 512,
+		Values: []chart.Value{
+			{Value: 5, Label: "Blue"},
+			{Value: 5, Label: "Green"},
+			{Value: 4, Label: "Gray"},
+			{Value: 4, Label: "Orange"},
+			{Value: 3, Label: "Deep Blue"},
+			{Value: 3, Label: "test"},
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	pie.Render(chart.PNG, f)
+}

examples/image_writer/main.go

@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"log"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 )
 
 func main() {

examples/legend/main.go

@@ -1,12 +1,14 @@
 package main
 
+//go:generate go run main.go
+
 import (
-	"net/http"
+	"os"
 
 	chart "github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 
 	/*
 	   In this example we add a `Renderable` or a custom component to the `Elements` array.
@@ -15,12 +17,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 	*/
 
 	graph := chart.Chart{
-		XAxis: chart.XAxis{
-			Style: chart.StyleShow(),
-		},
-		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
-		},
 		Background: chart.Style{
 			Padding: chart.Box{
 				Top:  20,
@@ -41,11 +37,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		chart.Legend(&graph),
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/legend_left/main.go

@@ -1,12 +1,14 @@
 package main
 
-import (
+//go:generate go run main.go
-	"net/http"
 
-	chart "github.com/wcharczuk/go-chart"
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 
 	/*
 	   In this example we add a `Renderable` or a custom component to the `Elements` array.
@@ -15,12 +17,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 	*/
 
 	graph := chart.Chart{
-		XAxis: chart.XAxis{
-			Style: chart.StyleShow(),
-		},
-		YAxis: chart.YAxis{
-			Style: chart.StyleShow(),
-		},
 		Background: chart.Style{
 			Padding: chart.Box{
 				Top:  20,
@@ -101,11 +97,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		chart.LegendLeft(&graph),
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/linear_regression/main.go

@@ -1,13 +1,14 @@
 package main
 
+//go:generate go run main.go
+
 import (
-	"net/http"
+	"os"
 
 	chart "github.com/wcharczuk/go-chart"
-	"github.com/wcharczuk/go-chart/seq"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 
 	/*
 		In this example we add a new type of series, a `SimpleMovingAverageSeries` that takes another series as a required argument.
@@ -16,8 +17,8 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	mainSeries := chart.ContinuousSeries{
 		Name:    "A test series",
-		XValues: SeqRange(1.0, 100.0),             //generates a []float64 from 1.0 to 100.0 in 1.0 step increments, or 100 elements.
+		XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(1.0).WithEnd(100.0)}.Values(),        //generates a []float64 from 1.0 to 100.0 in 1.0 step increments, or 100 elements.
-		YValues: seq.RandomValuesWithMax(100, 100), //generates a []float64 randomly from 0 to 100 with 100 elements.
+		YValues: chart.Seq{Sequence: chart.NewRandomSequence().WithLen(100).WithMin(0).WithMax(100)}.Values(), //generates a []float64 randomly from 0 to 100 with 100 elements.
 	}
 
 	// note we create a LinearRegressionSeries series by assignin the inner series.
@@ -33,11 +34,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/min_max/main.go

@@ -1,22 +1,22 @@
 package main
 
-import (
+//go:generate go run main.go
-	"net/http"
 
-	chart "github.com/wcharczuk/go-chart"
+import (
-	"github.com/wcharczuk/go-chart/seq"
+	"os"
+
+	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 	mainSeries := chart.ContinuousSeries{
 		Name:    "A test series",
-		XValues: SeqRange(1.0, 100.0),
+		XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(1.0).WithEnd(100.0)}.Values(),
-		YValues: seq.New(seq.NewRandom().WithLen(100).WithMax(150).WithMin(50)).Array(),
+		YValues: chart.Seq{Sequence: chart.NewRandomSequence().WithLen(100).WithMin(50).WithMax(150)}.Values(),
 	}
 
 	minSeries := &chart.MinSeries{
 		Style: chart.Style{
-			Show:            true,
 			StrokeColor:     chart.ColorAlternateGray,
 			StrokeDashArray: []float64{5.0, 5.0},
 		},
@@ -25,7 +25,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	maxSeries := &chart.MaxSeries{
 		Style: chart.Style{
-			Show:            true,
 			StrokeColor:     chart.ColorAlternateGray,
 			StrokeDashArray: []float64{5.0, 5.0},
 		},
@@ -36,35 +35,27 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		Width:  1920,
 		Height: 1080,
 		YAxis: chart.YAxis{
-			Name:      "Random Values",
+			Name: "Random Values",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
 			Range: &chart.ContinuousRange{
 				Min: 25,
 				Max: 175,
 			},
 		},
 		XAxis: chart.XAxis{
-			Name:      "Random Other Values",
+			Name: "Random Other Values",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
 		},
 		Series: []chart.Series{
 			mainSeries,
 			minSeries,
 			maxSeries,
-			chart.LastValueAnnotation(minSeries),
+			chart.LastValueAnnotationSeries(minSeries),
-			chart.LastValueAnnotation(maxSeries),
+			chart.LastValueAnnotationSeries(maxSeries),
 		},
 	}
 
 	graph.Elements = []chart.Renderable{chart.Legend(&graph)}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/pie_chart/main.go

@@ -0,0 +1,29 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+	pie := chart.PieChart{
+		Width:  512,
+		Height: 512,
+		Values: []chart.Value{
+			{Value: 5, Label: "Blue"},
+			{Value: 5, Label: "Green"},
+			{Value: 4, Label: "Gray"},
+			{Value: 4, Label: "Orange"},
+			{Value: 3, Label: "Deep Blue"},
+			{Value: 3, Label: "??"},
+			{Value: 1, Label: "!!"},
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	pie.Render(chart.PNG, f)
+}

examples/poly_regression/main.go

@@ -1,13 +1,14 @@
 package main
 
+//go:generate go run main.go
+
 import (
-	"net/http"
+	"os"
 
 	chart "github.com/wcharczuk/go-chart"
-	"github.com/wcharczuk/go-chart/seq"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 
 	/*
 		In this example we add a new type of series, a `PolynomialRegressionSeries` that takes another series as a required argument.
@@ -16,8 +17,8 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	mainSeries := chart.ContinuousSeries{
 		Name:    "A test series",
-		XValues: SeqRange(1.0, 100.0),             //generates a []float64 from 1.0 to 100.0 in 1.0 step increments, or 100 elements.
+		XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(1.0).WithEnd(100.0)}.Values(),        //generates a []float64 from 1.0 to 100.0 in 1.0 step increments, or 100 elements.
-		YValues: seq.RandomValuesWithMax(100, 100), //generates a []float64 randomly from 0 to 100 with 100 elements.
+		YValues: chart.Seq{Sequence: chart.NewRandomSequence().WithLen(100).WithMin(0).WithMax(100)}.Values(), //generates a []float64 randomly from 0 to 100 with 100 elements.
 	}
 
 	polyRegSeries := &chart.PolynomialRegressionSeries{
@@ -32,11 +33,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/request_timings/main.go

@@ -1,14 +1,22 @@
 package main
 
+//go:generate go run main.go
+
 import (
 	"fmt"
 	"net/http"
+	"os"
 	"strconv"
 	"time"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 )
 
+func main() {
+	log := chart.NewLogger()
+	drawChart(log)
+}
+
 func parseInt(str string) int {
 	v, _ := strconv.Atoi(str)
 	return v
@@ -110,24 +118,16 @@ func drawChart(log chart.Logger) http.HandlerFunc {
 			Series: []chart.Series{
 				mainSeries,
 				linreg,
-				chart.LastValueAnnotation(linreg),
+				chart.LastValueAnnotationSeries(linreg),
 				sma,
-				chart.LastValueAnnotation(sma),
+				chart.LastValueAnnotationSeries(sma),
 			},
 		}
 
 		graph.Elements = []chart.Renderable{chart.LegendThin(&graph)}
 
-		res.Header().Set("Content-Type", chart.ContentTypePNG)
+		f, _ := os.Create("output.png")
-		if err := graph.Render(chart.PNG, res); err != nil {
+		defer f.Close()
-			log.Err(err)
+		graph.Render(chart.PNG, f)
-		}
 	}
 }
-
-func main() {
-	log := chart.NewLogger()
-	log.Infof("listening on :8080")
-	http.HandleFunc("/", drawChart(log))
-	http.ListenAndServe(":8080", nil)
-}

examples/rerender/main.go

@@ -6,7 +6,7 @@ import (
 	"sync"
 	"time"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 )
 
 var lock sync.Mutex

examples/scatter/main.go

@@ -6,7 +6,7 @@ import (
 
 	_ "net/http/pprof"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 	"github.com/wcharczuk/go-chart/drawing"
 )
 
@@ -20,13 +20,12 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		Series: []chart.Series{
 			chart.ContinuousSeries{
 				Style: chart.Style{
-					Show:             true,
 					StrokeWidth:      chart.Disabled,
 					DotWidth:         5,
 					DotColorProvider: viridisByY,
 				},
-				XValues: chart.SeqRange(0, 127),
+				XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(0).WithEnd(127)}.Values(),
-				YValues: chart.NewSeq(chart.NewSeqRandom().WithLen(128).WithMax(1024)).Values(),
+				YValues: chart.Seq{Sequence: chart.NewRandomSequence().WithLen(128).WithMin(0).WithMax(1024)}.Values(),
 			},
 		},
 	}
@@ -50,8 +49,8 @@ func unit(res http.ResponseWriter, req *http.Request) {
 		},
 		Series: []chart.Series{
 			chart.ContinuousSeries{
-				XValues: chart.SeqRangeWithStep(0, 4, 1),
+				XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(0).WithEnd(4)}.Values(),
-				YValues: chart.SeqRangeWithStep(0, 4, 1),
+				YValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(0).WithEnd(4)}.Values(),
 			},
 		},
 	}

examples/simple_moving_average/main.go

@@ -1,17 +1,18 @@
 package main
 
-import (
+//go:generate go run main.go
-	"net/http"
 
-	chart "github.com/wcharczuk/go-chart"
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
-
 	mainSeries := chart.ContinuousSeries{
 		Name:    "A test series",
-		XValues: chart.SeqRange(1.0, 100.0),             //generates a []float64 from 1.0 to 100.0 in 1.0 step increments, or 100 elements.
+		XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(1.0).WithEnd(100.0)}.Values(),        //generates a []float64 from 1.0 to 100.0 in 1.0 step increments, or 100 elements.
-		YValues: chart.SeqRandomValuesWithMax(100, 100), //generates a []float64 randomly from 0 to 100 with 100 elements.
+		YValues: chart.Seq{Sequence: chart.NewRandomSequence().WithLen(100).WithMin(0).WithMax(100)}.Values(), //generates a []float64 randomly from 0 to 100 with 100 elements.
 	}
 
 	// note we create a SimpleMovingAverage series by assignin the inner series.
@@ -27,11 +28,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/stacked_bar/main.go

@@ -1,25 +1,20 @@
 package main
 
 import (
-	"fmt"
+	"os"
-	"log"
-	"net/http"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 	sbc := chart.StackedBarChart{
-		Title:      "Test Stacked Bar Chart",
+		Title: "Test Stacked Bar Chart",
-		TitleStyle: chart.StyleShow(),
 		Background: chart.Style{
 			Padding: chart.Box{
 				Top: 40,
 			},
 		},
 		Height: 512,
-		XAxis:  chart.StyleShow(),
-		YAxis:  chart.StyleShow(),
 		Bars: []chart.StackedBar{
 			{
 				Name: "This is a very long string to test word break wrapping.",
@@ -52,14 +47,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	err := sbc.Render(chart.PNG, res)
+	defer f.Close()
-	if err != nil {
+	sbc.Render(chart.PNG, f)
-		fmt.Printf("Error rendering chart: %v\n", err)
-	}
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	log.Fatal(http.ListenAndServe(":8080", nil))
 }

examples/stock_analysis/main.go

@@ -1,14 +1,16 @@
 package main
 
+//go:generate go run main.go
+
 import (
-	"net/http"
+	"os"
 	"time"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 	"github.com/wcharczuk/go-chart/drawing"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 	xv, yv := xvalues(), yvalues()
 
 	priceSeries := chart.TimeSeries{
@@ -55,8 +57,9 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }
 
 func xvalues() []time.Time {
@@ -73,8 +76,3 @@ func xvalues() []time.Time {
 func yvalues() []float64 {
 	return []float64{212.47, 212.59, 211.76, 211.37, 210.18, 208.00, 206.79, 209.33, 210.77, 210.82, 210.50, 209.79, 209.38, 210.07, 208.35, 207.95, 210.57, 208.66, 208.92, 208.66, 209.42, 210.59, 209.98, 208.32, 203.97, 197.83, 189.50, 187.27, 194.46, 199.27, 199.28, 197.67, 191.77, 195.41, 195.55, 192.59, 197.43, 194.79, 195.85, 196.74, 196.01, 198.45, 200.18, 199.73, 195.45, 196.46, 193.90, 193.60, 192.90, 192.87, 188.01, 188.12, 191.63, 192.13, 195.00, 198.47, 197.79, 199.41, 201.21, 201.33, 201.52, 200.25, 199.29, 202.35, 203.27, 203.37, 203.11, 201.85, 205.26, 207.51, 207.00, 206.60, 208.95, 208.83, 207.93, 210.39, 211.00, 210.36, 210.15, 210.04, 208.08, 208.56, 207.74, 204.84, 202.54, 205.62, 205.47, 208.73, 208.55, 209.31, 209.07, 209.35, 209.32, 209.56, 208.69, 210.68, 208.53, 205.61, 209.62, 208.35, 206.95, 205.34, 205.87, 201.88, 202.90, 205.03, 208.03, 204.86, 200.02, 201.67, 203.50, 206.02, 205.68, 205.21, 207.40, 205.93, 203.87, 201.02, 201.36, 198.82, 194.05, 191.92, 192.11, 193.66, 188.83, 191.93, 187.81, 188.06, 185.65, 186.69, 190.52, 187.64, 190.20, 188.13, 189.11, 193.72, 193.65, 190.16, 191.30, 191.60, 187.95, 185.42, 185.43, 185.27, 182.86, 186.63, 189.78, 192.88, 192.09, 192.00, 194.78, 192.32, 193.20, 195.54, 195.09, 193.56, 198.11, 199.00, 199.78, 200.43, 200.59, 198.40, 199.38, 199.54, 202.76, 202.50, 202.17, 203.34, 204.63, 204.38, 204.67, 204.56, 203.21, 203.12, 203.24, 205.12, 206.02, 205.52, 206.92, 206.25, 204.19, 206.42, 203.95, 204.50, 204.02, 205.92, 208.00, 208.01, 207.78, 209.24, 209.90, 210.10, 208.97, 208.97, 208.61, 208.92, 209.35, 207.45, 206.33, 207.97, 206.16, 205.01, 204.97, 205.72, 205.89, 208.45, 206.50, 206.56, 204.76, 206.78, 204.85, 204.91, 204.20, 205.49, 205.21, 207.87, 209.28, 209.34, 210.24, 209.84, 210.27, 210.91, 210.28, 211.35, 211.68, 212.37, 212.08, 210.07, 208.45, 208.04, 207.75, 208.37, 206.52, 207.85, 208.44, 208.10, 210.81, 203.24, 199.60, 203.20, 206.66, 209.48, 209.92, 208.41, 209.66, 209.53, 212.65, 213.40, 214.95, 214.92, 216.12, 215.83}
 }
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
-}

examples/text_rotation/main.go

@@ -1,13 +1,15 @@
 package main
 
-import (
+//go:generate go run main.go
-	"net/http"
 
-	chart "github.com/wcharczuk/go-chart"
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
 	"github.com/wcharczuk/go-chart/drawing"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 	f, _ := chart.GetDefaultFont()
 	r, _ := chart.PNG(1024, 1024)
 
@@ -43,11 +45,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		StrokeWidth: 2,
 	})
 
-	res.Header().Set("Content-Type", "image/png")
+	file, _ := os.Create("output.png")
-	r.Save(res)
+	defer file.Close()
-}
+	r.Save(file)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/timeseries/main.go

@@ -13,9 +13,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 	   Note: chart.TimeSeries implements `ValueFormatterProvider` and as a result gives the XAxis the appropriate formatter to use for the ticks.
 	*/
 	graph := chart.Chart{
-		XAxis: chart.XAxis{
-			Style: chart.StyleShow(),
-		},
 		Series: []chart.Series{
 			chart.TimeSeries{
 				XValues: []time.Time{
@@ -46,7 +43,6 @@ func drawCustomChart(res http.ResponseWriter, req *http.Request) {
 	*/
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style:          chart.StyleShow(),
 			ValueFormatter: chart.TimeHourValueFormatter,
 		},
 		Series: []chart.Series{

examples/twoaxis/main.go

@@ -1,13 +1,15 @@
 package main
 
+//go:generate go run main.go
+
 import (
 	"fmt"
-	"net/http"
+	"os"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 )
 
-func drawChart(res http.ResponseWriter, req *http.Request) {
+func main() {
 
 	/*
 	   In this example we add a second series, and assign it to the secondary y axis, giving that series it's own range.
@@ -17,7 +19,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 
 	graph := chart.Chart{
 		XAxis: chart.XAxis{
-			Style:        chart.StyleShow(), //enables / displays the x-axis
 			TickPosition: chart.TickPositionBetweenTicks,
 			ValueFormatter: func(v interface{}) string {
 				typed := v.(float64)
@@ -25,12 +26,6 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 				return fmt.Sprintf("%d-%d\n%d", typedDate.Month(), typedDate.Day(), typedDate.Year())
 			},
 		},
-		YAxis: chart.YAxis{
-			Style: chart.StyleShow(), //enables / displays the y-axis
-		},
-		YAxisSecondary: chart.YAxis{
-			Style: chart.StyleShow(), //enables / displays the secondary y-axis
-		},
 		Series: []chart.Series{
 			chart.ContinuousSeries{
 				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
@@ -44,11 +39,7 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
 		},
 	}
 
-	res.Header().Set("Content-Type", "image/png")
+	f, _ := os.Create("output.png")
-	graph.Render(chart.PNG, res)
+	defer f.Close()
-}
+	graph.Render(chart.PNG, f)
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
 }

examples/twopoint/main.go

@@ -1,28 +1,27 @@
 package main
 
+//go:generate go run main.go
+
 import (
 	"bytes"
 	"log"
 	"os"
 
-	chart "github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart"
 )
 
 func main() {
-
 	var b float64
 	b = 1000
 
 	ts1 := chart.ContinuousSeries{ //TimeSeries{
 		Name:    "Time Series",
-		Style:   chart.StyleShow(),
 		XValues: []float64{10 * b, 20 * b, 30 * b, 40 * b, 50 * b, 60 * b, 70 * b, 80 * b},
 		YValues: []float64{1.0, 2.0, 30.0, 4.0, 50.0, 6.0, 7.0, 88.0},
 	}
 
 	ts2 := chart.ContinuousSeries{ //TimeSeries{
 		Style: chart.Style{
-			Show:        true,
 			StrokeColor: chart.GetDefaultColor(1),
 		},
 
@@ -34,15 +33,11 @@ func main() {
 
 		XAxis: chart.XAxis{
 			Name:           "The XAxis",
-			NameStyle:      chart.StyleShow(),
-			Style:          chart.StyleShow(),
 			ValueFormatter: chart.TimeMinuteValueFormatter, //TimeHourValueFormatter,
 		},
 
 		YAxis: chart.YAxis{
-			Name:      "The YAxis",
+			Name: "The YAxis",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
 		},
 
 		Series: []chart.Series{