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
-line charts.
+Package `chart` is a very simple golang native charting library that supports timeseries and continuous 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 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.
+Master should now be on the v3.x codebase, which overhauls the api significantly. 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
-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`.
+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.
 
 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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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",
-		TitleStyle: chart.StyleShow(),
+		Title: "Bar Chart Using BaseValue",
 		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")
-	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))
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	sbc.Render(chart.PNG, f)
 }

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) {
 			},
 		},
 	}
-
-	res.Header().Set("Content-Type", "image/png")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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 (
-	"net/http"
+//go:generate go run main.go
 
-	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) {
 			},
 		},
 	}
-
-	res.Header().Set("Content-Type", "image/png")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

examples/custom_styles/main.go

@@ -1,13 +1,15 @@
 package main
 
-import (
-	"net/http"
+//go:generate go run main.go
 
-	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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

examples/custom_ticks/main.go

@@ -1,12 +1,14 @@
 package main
 
-import (
-	"net/http"
+//go:generate go run main.go
 
-	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) {
 			},
 		},
 	}
-
-	res.Header().Set("Content-Type", "image/png")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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{
-			Style: chart.StyleShow(),
+		XAxis:  chart.XAxis{
 			/*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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

examples/legend_left/main.go

@@ -1,12 +1,14 @@
 package main
 
-import (
-	"net/http"
+//go:generate go run main.go
 
-	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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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.
-		YValues: seq.RandomValuesWithMax(100, 100), //generates a []float64 randomly from 0 to 100 with 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.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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

examples/min_max/main.go

@@ -1,22 +1,22 @@
 package main
 
-import (
-	"net/http"
+//go:generate go run main.go
 
-	chart "github.com/wcharczuk/go-chart"
-	"github.com/wcharczuk/go-chart/seq"
+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: SeqRange(1.0, 100.0),
-		YValues: seq.New(seq.NewRandom().WithLen(100).WithMax(150).WithMin(50)).Array(),
+		XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(1.0).WithEnd(100.0)}.Values(),
+		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",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
+			Name: "Random Values",
 			Range: &chart.ContinuousRange{
 				Min: 25,
 				Max: 175,
 			},
 		},
 		XAxis: chart.XAxis{
-			Name:      "Random Other Values",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
+			Name: "Random Other Values",
 		},
 		Series: []chart.Series{
 			mainSeries,
 			minSeries,
 			maxSeries,
-			chart.LastValueAnnotation(minSeries),
-			chart.LastValueAnnotation(maxSeries),
+			chart.LastValueAnnotationSeries(minSeries),
+			chart.LastValueAnnotationSeries(maxSeries),
 		},
 	}
 
 	graph.Elements = []chart.Renderable{chart.Legend(&graph)}
 
-	res.Header().Set("Content-Type", "image/png")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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.
-		YValues: seq.RandomValuesWithMax(100, 100), //generates a []float64 randomly from 0 to 100 with 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.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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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)
-		if err := graph.Render(chart.PNG, res); err != nil {
-			log.Err(err)
-		}
+		f, _ := os.Create("output.png")
+		defer f.Close()
+		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),
-				YValues: chart.NewSeq(chart.NewSeqRandom().WithLen(128).WithMax(1024)).Values(),
+				XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(0).WithEnd(127)}.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),
-				YValues: chart.SeqRangeWithStep(0, 4, 1),
+				XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(0).WithEnd(4)}.Values(),
+				YValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(0).WithEnd(4)}.Values(),
 			},
 		},
 	}

examples/simple_moving_average/main.go

@@ -1,17 +1,18 @@
 package main
 
-import (
-	"net/http"
+//go:generate go run main.go
 
-	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.
-		YValues: chart.SeqRandomValuesWithMax(100, 100), //generates a []float64 randomly from 0 to 100 with 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.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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

examples/stacked_bar/main.go

@@ -1,25 +1,20 @@
 package main
 
 import (
-	"fmt"
-	"log"
-	"net/http"
+	"os"
 
-	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",
-		TitleStyle: chart.StyleShow(),
+		Title: "Test Stacked Bar Chart",
 		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")
-	err := sbc.Render(chart.PNG, res)
-	if err != nil {
-		fmt.Printf("Error rendering chart: %v\n", err)
-	}
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	log.Fatal(http.ListenAndServe(":8080", nil))
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	sbc.Render(chart.PNG, f)
 }

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")
-	graph.Render(chart.PNG, res)
+	f, _ := os.Create("output.png")
+	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 (
-	"net/http"
+//go:generate go run main.go
 
-	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")
-	r.Save(res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	file, _ := os.Create("output.png")
+	defer file.Close()
+	r.Save(file)
 }

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")
-	graph.Render(chart.PNG, res)
-}
-
-func main() {
-	http.HandleFunc("/", drawChart)
-	http.ListenAndServe(":8080", nil)
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
 }

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",
-			NameStyle: chart.StyleShow(),
-			Style:     chart.StyleShow(),
+			Name: "The YAxis",
 		},
 
 		Series: []chart.Series{