switching to generators

examples/annotations/main.go

@@ -0,0 +1,44 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+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).
+
+	   It is important to not that the chart automatically sizes the canvas box to fit the annotations,
+	   As well as automatically assign a series color for the `Stroke` or border component of the series.
+
+	   The annotation series is most often used by the original author to show the last value of another series, but
+	   they can be used in other capacities as well.
+	*/
+
+	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},
+			},
+			chart.AnnotationSeries{
+				Annotations: []chart.Value2{
+					{XValue: 1.0, YValue: 1.0, Label: "One"},
+					{XValue: 2.0, YValue: 2.0, Label: "Two"},
+					{XValue: 3.0, YValue: 3.0, Label: "Three"},
+					{XValue: 4.0, YValue: 4.0, Label: "Four"},
+					{XValue: 5.0, YValue: 5.0, Label: "Five"},
+				},
+			},
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/axes/main.go

@@ -0,0 +1,34 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	chart "github.com/wcharczuk/go-chart"
+)
+
+func main() {
+
+	/*
+	   The below will draw the same chart as the `basic` example, except with both the x and y axes turned on.
+	   In this case, both the x and y axis ticks are generated automatically, the x and y ranges are established automatically, the canvas "box" is adjusted to fit the space the axes occupy so as not to clip.
+	*/
+
+	graph := chart.Chart{
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				Style: chart.Style{
+					StrokeColor: chart.GetDefaultColor(0).WithAlpha(64),
+					FillColor:   chart.GetDefaultColor(0).WithAlpha(64),
+				},
+				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/axes_labels/main.go

@@ -0,0 +1,40 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	chart "github.com/wcharczuk/go-chart"
+)
+
+func main() {
+
+	/*
+	   The below will draw the same chart as the `basic` example, except with both the x and y axes turned on.
+	   In this case, both the x and y axis ticks are generated automatically, the x and y ranges are established automatically, the canvas "box" is adjusted to fit the space the axes occupy so as not to clip.
+	*/
+
+	graph := chart.Chart{
+		XAxis: chart.XAxis{
+			Name: "The XAxis",
+		},
+		YAxis: chart.YAxis{
+			Name: "The YAxis",
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				Style: chart.Style{
+					StrokeColor: chart.GetDefaultColor(0).WithAlpha(64),
+					FillColor:   chart.GetDefaultColor(0).WithAlpha(64),
+				},
+				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/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

@@ -0,0 +1,62 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart/drawing"
+)
+
+func main() {
+	profitStyle := chart.Style{
+		FillColor:   drawing.ColorFromHex("13c158"),
+		StrokeColor: drawing.ColorFromHex("13c158"),
+		StrokeWidth: 0,
+	}
+
+	lossStyle := chart.Style{
+		FillColor:   drawing.ColorFromHex("c11313"),
+		StrokeColor: drawing.ColorFromHex("c11313"),
+		StrokeWidth: 0,
+	}
+
+	sbc := chart.BarChart{
+		Title: "Bar Chart Using BaseValue",
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top: 40,
+			},
+		},
+		Height:   512,
+		BarWidth: 60,
+		YAxis: chart.YAxis{
+			Ticks: []chart.Tick{
+				{Value: -4.0, Label: "-4"},
+				{Value: -2.0, Label: "-2"},
+				{Value: 0, Label: "0"},
+				{Value: 2.0, Label: "2"},
+				{Value: 4.0, Label: "4"},
+				{Value: 6.0, Label: "6"},
+				{Value: 8.0, Label: "8"},
+				{Value: 10.0, Label: "10"},
+				{Value: 12.0, Label: "12"},
+			},
+		},
+		UseBaseValue: true,
+		BaseValue:    0.0,
+		Bars: []chart.Value{
+			{Value: 10.0, Style: profitStyle, Label: "Profit"},
+			{Value: 12.0, Style: profitStyle, Label: "More Profit"},
+			{Value: 8.0, Style: profitStyle, Label: "Still Profit"},
+			{Value: -4.0, Style: lossStyle, Label: "Loss!"},
+			{Value: 3.0, Style: profitStyle, Label: "Phew Ok"},
+			{Value: -2.0, Style: lossStyle, Label: "Oh No!"},
+		},
+	}
+
+	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

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+// Note: Additional examples on how to add Stylesheets are in the custom_stylesheets example
+
+func inlineSVGWithClasses(res http.ResponseWriter, req *http.Request) {
+	res.Write([]byte(
+		"<!DOCTYPE html><html><head>" +
+			"<link rel=\"stylesheet\" type=\"text/css\" href=\"/main.css\">" +
+			"</head>" +
+			"<body>"))
+
+	pie := chart.PieChart{
+		// Notes: * Setting ClassName will cause all other inline styles to be dropped!
+		//        * The following type classes may be added additionally: stroke, fill, text
+		Background: chart.Style{ClassName: "background"},
+		Canvas: chart.Style{
+			ClassName: "canvas",
+		},
+		Width:  512,
+		Height: 512,
+		Values: []chart.Value{
+			{Value: 5, Label: "Blue", Style: chart.Style{ClassName: "blue"}},
+			{Value: 5, Label: "Green", Style: chart.Style{ClassName: "green"}},
+			{Value: 4, Label: "Gray", Style: chart.Style{ClassName: "gray"}},
+		},
+	}
+
+	err := pie.Render(chart.SVG, res)
+	if err != nil {
+		fmt.Printf("Error rendering pie chart: %v\n", err)
+	}
+	res.Write([]byte("</body>"))
+}
+
+func css(res http.ResponseWriter, req *http.Request) {
+	res.Header().Set("Content-Type", "text/css")
+	res.Write([]byte("svg .background { fill: white; }" +
+		"svg .canvas { fill: white; }" +
+		"svg .blue.fill.stroke { fill: blue; stroke: lightblue; }" +
+		"svg .green.fill.stroke { fill: green; stroke: lightgreen; }" +
+		"svg .gray.fill.stroke { fill: gray; stroke: lightgray; }" +
+		"svg .blue.text { fill: white; }" +
+		"svg .green.text { fill: white; }" +
+		"svg .gray.text { fill: white; }"))
+}
+
+func main() {
+	http.HandleFunc("/", inlineSVGWithClasses)
+	http.HandleFunc("/main.css", css)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}

examples/custom_formatters/main.go

@@ -0,0 +1,38 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+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.
+	   This example also shows what the chart looks like with the x-axis left off or not shown.
+	*/
+
+	graph := chart.Chart{
+		YAxis: chart.YAxis{
+			ValueFormatter: func(v interface{}) string {
+				if vf, isFloat := v.(float64); isFloat {
+					return fmt.Sprintf("%0.6f", vf)
+				}
+				return ""
+			},
+		},
+		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/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

@@ -0,0 +1,34 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+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.
+	*/
+
+	graph := chart.Chart{
+		YAxis: chart.YAxis{
+			Range: &chart.ContinuousRange{
+				Min: 0.0,
+				Max: 10.0,
+			},
+		},
+		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/custom_styles/main.go

@@ -0,0 +1,38 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart/drawing"
+)
+
+func main() {
+	/*
+	   In this example we set some custom colors for the series and the chart background and canvas.
+	*/
+	graph := chart.Chart{
+		Background: chart.Style{
+			FillColor: drawing.ColorBlue,
+		},
+		Canvas: chart.Style{
+			FillColor: drawing.ColorFromHex("efefef"),
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				Style: chart.Style{
+					StrokeColor: drawing.ColorRed,               // will supercede defaults
+					FillColor:   drawing.ColorRed.WithAlpha(64), // will supercede defaults
+				},
+				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/custom_stylesheets/inlineOutput.svg

@@ -0,0 +1,21 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="512" height="512">\n<style type="text/css"><![CDATA[svg .background { fill: white; }svg .canvas { fill: white; }svg path.blue { fill: blue; stroke: lightblue; }svg path.green { fill: green; stroke: lightgreen; }svg path.gray { fill: gray; stroke: lightgray; }svg text.blue { fill: white; }svg text.green { fill: white; }svg text.gray { fill: white; }]]></style><path  d="M 0 0
+L 512 0
+L 512 512
+L 0 512
+L 0 0" class="background"/><path  d="M 5 5
+L 507 5
+L 507 507
+L 5 507
+L 5 5" class="canvas"/><path  d="M 256 256
+L 507 256
+A 251 251 128.56 0 1 100 452
+L 256 256
+Z" class="blue"/><path  d="M 256 256
+L 100 452
+A 251 251 128.56 0 1 201 12
+L 256 256
+Z" class="green"/><path  d="M 256 256
+L 201 12
+A 251 251 102.85 0 1 506 256
+L 256 256
+Z" class="gray"/><text x="313" y="413" class="blue">Blue</text><text x="73" y="226" class="green">Green</text><text x="344" y="133" class="gray">Gray</text></svg>

examples/custom_stylesheets/main.go

@@ -0,0 +1,88 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+const style = "svg .background { fill: white; }" +
+	"svg .canvas { fill: white; }" +
+	"svg .blue.fill.stroke { fill: blue; stroke: lightblue; }" +
+	"svg .green.fill.stroke { fill: green; stroke: lightgreen; }" +
+	"svg .gray.fill.stroke { fill: gray; stroke: lightgray; }" +
+	"svg .blue.text { fill: white; }" +
+	"svg .green.text { fill: white; }" +
+	"svg .gray.text { fill: white; }"
+
+func svgWithCustomInlineCSS(res http.ResponseWriter, _ *http.Request) {
+	res.Header().Set("Content-Type", chart.ContentTypeSVG)
+
+	// Render the CSS with custom css
+	err := pieChart().Render(chart.SVGWithCSS(style, ""), res)
+	if err != nil {
+		fmt.Printf("Error rendering pie chart: %v\n", err)
+	}
+}
+
+func svgWithCustomInlineCSSNonce(res http.ResponseWriter, _ *http.Request) {
+	// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src
+	// This should be randomly generated on every request!
+	const nonce = "RAND0MBASE64"
+
+	res.Header().Set("Content-Security-Policy", fmt.Sprintf("style-src 'nonce-%s'", nonce))
+	res.Header().Set("Content-Type", chart.ContentTypeSVG)
+
+	// Render the CSS with custom css and a nonce.
+	// Try changing the nonce to a different string - your browser should block the CSS.
+	err := pieChart().Render(chart.SVGWithCSS(style, nonce), res)
+	if err != nil {
+		fmt.Printf("Error rendering pie chart: %v\n", err)
+	}
+}
+
+func svgWithCustomExternalCSS(res http.ResponseWriter, _ *http.Request) {
+	// Add external CSS
+	res.Write([]byte(
+		`<?xml version="1.0" standalone="no"?>` +
+			`<?xml-stylesheet href="/main.css" type="text/css"?>` +
+			`<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">`))
+
+	res.Header().Set("Content-Type", chart.ContentTypeSVG)
+	err := pieChart().Render(chart.SVG, res)
+	if err != nil {
+		fmt.Printf("Error rendering pie chart: %v\n", err)
+	}
+}
+
+func pieChart() chart.PieChart {
+	return chart.PieChart{
+		// Note that setting ClassName will cause all other inline styles to be dropped!
+		Background: chart.Style{ClassName: "background"},
+		Canvas: chart.Style{
+			ClassName: "canvas",
+		},
+		Width:  512,
+		Height: 512,
+		Values: []chart.Value{
+			{Value: 5, Label: "Blue", Style: chart.Style{ClassName: "blue"}},
+			{Value: 5, Label: "Green", Style: chart.Style{ClassName: "green"}},
+			{Value: 4, Label: "Gray", Style: chart.Style{ClassName: "gray"}},
+		},
+	}
+}
+
+func css(res http.ResponseWriter, req *http.Request) {
+	res.Header().Set("Content-Type", "text/css")
+	res.Write([]byte(style))
+}
+
+func main() {
+	http.HandleFunc("/", svgWithCustomInlineCSS)
+	http.HandleFunc("/nonce", svgWithCustomInlineCSSNonce)
+	http.HandleFunc("/external", svgWithCustomExternalCSS)
+	http.HandleFunc("/main.css", css)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}

examples/custom_ticks/main.go

@@ -0,0 +1,42 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+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.
+	*/
+
+	graph := chart.Chart{
+		YAxis: chart.YAxis{
+			Range: &chart.ContinuousRange{
+				Min: 0.0,
+				Max: 4.0,
+			},
+			Ticks: []chart.Tick{
+				{Value: 0.0, Label: "0.00"},
+				{Value: 2.0, Label: "2.00"},
+				{Value: 4.0, Label: "4.00"},
+				{Value: 6.0, Label: "6.00"},
+				{Value: 8.0, Label: "Eight"},
+				{Value: 10.0, Label: "Ten"},
+			},
+		},
+		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/descending/main.go

@@ -0,0 +1,49 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+
+	/*
+	   The below will draw the same chart as the `basic` example, except with both the x and y axes turned on.
+	   In this case, both the x and y axis ticks are generated automatically, the x and y ranges are established automatically,
+	   the canvas "box" is adjusted to fit the space the axes occupy so as not to clip.
+	   Additionally, it shows how you can use the "Descending" property of continuous ranges to change the ordering of
+	   how values (including ticks) are drawn.
+	*/
+
+	graph := chart.Chart{
+		Height: 500,
+		Width:  500,
+		XAxis:  chart.XAxis{
+			/*Range: &chart.ContinuousRange{
+				Descending: true,
+			},*/
+		},
+		YAxis: chart.YAxis{
+			Range: &chart.ContinuousRange{
+				Descending: true,
+			},
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				Style: chart.Style{
+					StrokeColor: chart.GetDefaultColor(0).WithAlpha(64),
+					FillColor:   chart.GetDefaultColor(0).WithAlpha(64),
+				},
+				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/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/donut_chart/reg.svg

@@ -0,0 +1,25 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="512" height="512">\n<path  d="M 0 0
+L 512 0
+L 512 512
+L 0 512
+L 0 0" style="stroke-width:0;stroke:rgba(255,255,255,1.0);fill:rgba(255,255,255,1.0)"/><path  d="M 5 5
+L 507 5
+L 507 507
+L 5 507
+L 5 5" style="stroke-width:0;stroke:rgba(255,255,255,1.0);fill:rgba(255,255,255,1.0)"/><path  d="M 256 256
+L 438 256
+A 182 182 225.00 1 1 127 127
+L 256 256
+Z" style="stroke-width:4;stroke:rgba(255,255,255,1.0);fill:rgba(106,195,203,1.0)"/><path  d="M 256 256
+L 127 127
+A 182 182 90.00 0 1 385 127
+L 256 256
+Z" style="stroke-width:4;stroke:rgba(255,255,255,1.0);fill:rgba(42,190,137,1.0)"/><path  d="M 256 256
+L 385 127
+A 182 182 45.00 0 1 438 256
+L 256 256
+Z" style="stroke-width:4;stroke:rgba(255,255,255,1.0);fill:rgba(110,128,139,1.0)"/><path  d="M 256 256
+L 321 256
+A 65 65 359.00 1 1 321 255
+L 256 256
+Z" style="stroke-width:4;stroke:rgba(255,255,255,1.0);fill:rgba(255,255,255,1.0)"/><text x="159" y="461" style="stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif">Blue</text><text x="241" y="48" style="stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif">Two</text><text x="440" y="181" style="stroke-width:0;stroke:none;fill:rgba(51,51,51,1.0);font-size:15.3px;font-family:'Roboto Medium',sans-serif">One</text></svg>

examples/image_writer/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"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},
+			},
+		},
+	}
+	collector := &chart.ImageWriter{}
+	graph.Render(chart.PNG, collector)
+
+	image, err := collector.Image()
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Final Image: %dx%d\n", image.Bounds().Size().X, image.Bounds().Size().Y)
+}

examples/legend/main.go

@@ -0,0 +1,43 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	chart "github.com/wcharczuk/go-chart"
+)
+
+func main() {
+
+	/*
+	   In this example we add a `Renderable` or a custom component to the `Elements` array.
+	   In this specific case it is a pre-built renderable (`CreateLegend`) that draws a legend for the chart's series.
+	   If you like, you can use `CreateLegend` as a template for writing your own renderable, or even your own legend.
+	*/
+
+	graph := chart.Chart{
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top:  20,
+				Left: 20,
+			},
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				Name:    "A test series",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+		},
+	}
+
+	//note we have to do this as a separate step because we need a reference to graph
+	graph.Elements = []chart.Renderable{
+		chart.Legend(&graph),
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/legend_left/main.go

@@ -0,0 +1,103 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+
+	/*
+	   In this example we add a `Renderable` or a custom component to the `Elements` array.
+	   In this specific case it is a pre-built renderable (`CreateLegend`) that draws a legend for the chart's series.
+	   If you like, you can use `CreateLegend` as a template for writing your own renderable, or even your own legend.
+	*/
+
+	graph := chart.Chart{
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top:  20,
+				Left: 260,
+			},
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				Name:    "A test series",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "Another test series",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "Yet Another test series",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "Even More series",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "Foo Bar",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "Bar Baz",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "Moo Bar",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "Zoo Bar Baz",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "Fast and the Furious",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{5.0, 4.0, 3.0, 2.0, 1.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "2 Fast 2 Furious",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{5.0, 4.0, 3.0, 2.0, 1.0},
+			},
+
+			chart.ContinuousSeries{
+				Name:    "They only get more fast and more furious",
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{5.0, 4.0, 3.0, 2.0, 1.0},
+			},
+		},
+	}
+
+	//note we have to do this as a separate step because we need a reference to graph
+	graph.Elements = []chart.Renderable{
+		chart.LegendLeft(&graph),
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/linear_regression/main.go

@@ -0,0 +1,40 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	chart "github.com/wcharczuk/go-chart"
+)
+
+func main() {
+
+	/*
+		In this example we add a new type of series, a `SimpleMovingAverageSeries` that takes another series as a required argument.
+		InnerSeries only needs to implement `ValuesProvider`, so really you could chain `SimpleMovingAverageSeries` together if you wanted.
+	*/
+
+	mainSeries := chart.ContinuousSeries{
+		Name:    "A test series",
+		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.
+	// we need to use a reference because `.Render()` needs to modify state within the series.
+	linRegSeries := &chart.LinearRegressionSeries{
+		InnerSeries: mainSeries,
+	} // we can optionally set the `WindowSize` property which alters how the moving average is calculated.
+
+	graph := chart.Chart{
+		Series: []chart.Series{
+			mainSeries,
+			linRegSeries,
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/min_max/main.go

@@ -0,0 +1,61 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+	mainSeries := chart.ContinuousSeries{
+		Name:    "A test series",
+		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{
+			StrokeColor:     chart.ColorAlternateGray,
+			StrokeDashArray: []float64{5.0, 5.0},
+		},
+		InnerSeries: mainSeries,
+	}
+
+	maxSeries := &chart.MaxSeries{
+		Style: chart.Style{
+			StrokeColor:     chart.ColorAlternateGray,
+			StrokeDashArray: []float64{5.0, 5.0},
+		},
+		InnerSeries: mainSeries,
+	}
+
+	graph := chart.Chart{
+		Width:  1920,
+		Height: 1080,
+		YAxis: chart.YAxis{
+			Name: "Random Values",
+			Range: &chart.ContinuousRange{
+				Min: 25,
+				Max: 175,
+			},
+		},
+		XAxis: chart.XAxis{
+			Name: "Random Other Values",
+		},
+		Series: []chart.Series{
+			mainSeries,
+			minSeries,
+			maxSeries,
+			chart.LastValueAnnotationSeries(minSeries),
+			chart.LastValueAnnotationSeries(maxSeries),
+		},
+	}
+
+	graph.Elements = []chart.Renderable{chart.Legend(&graph)}
+
+	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/pie_chart/reg.svg

@@ -0,0 +1,17 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="512" height="512">
+<path  d="M 256 256
+L 507 256
+A 251 251 225.00 1 1 79 79
+L 256 256
+Z" style="stroke-width:5;stroke:rgba(255,255,255,1.0);fill:rgba(106,195,203,1.0)"/>
+<path  d="M 256 256
+L 79 79
+A 251 251 90.00 0 1 433 79
+L 256 256
+Z" style="stroke-width:5;stroke:rgba(255,255,255,1.0);fill:rgba(42,190,137,1.0)"/>
+<path  d="M 256 256
+L 433 79
+A 251 251 45.00 0 1 507 256
+L 256 256
+Z" style="stroke-width:5;stroke:rgba(255,255,255,1.0);fill:rgba(110,128,139,1.0)"/>
+</svg>

examples/poly_regression/main.go

@@ -0,0 +1,39 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	chart "github.com/wcharczuk/go-chart"
+)
+
+func main() {
+
+	/*
+		In this example we add a new type of series, a `PolynomialRegressionSeries` that takes another series as a required argument.
+		InnerSeries only needs to implement `ValuesProvider`, so really you could chain `PolynomialRegressionSeries` together if you wanted.
+	*/
+
+	mainSeries := chart.ContinuousSeries{
+		Name:    "A test series",
+		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{
+		Degree:      3,
+		InnerSeries: mainSeries,
+	}
+
+	graph := chart.Chart{
+		Series: []chart.Series{
+			mainSeries,
+			polyRegSeries,
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/request_timings/main.go

@@ -0,0 +1,133 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+	log := chart.NewLogger()
+	drawChart(log)
+}
+
+func parseInt(str string) int {
+	v, _ := strconv.Atoi(str)
+	return v
+}
+
+func parseFloat64(str string) float64 {
+	v, _ := strconv.ParseFloat(str, 64)
+	return v
+}
+
+func readData() ([]time.Time, []float64) {
+	var xvalues []time.Time
+	var yvalues []float64
+	err := chart.ReadLines("requests.csv", func(line string) error {
+		parts := chart.SplitCSV(line)
+		year := parseInt(parts[0])
+		month := parseInt(parts[1])
+		day := parseInt(parts[2])
+		hour := parseInt(parts[3])
+		elapsedMillis := parseFloat64(parts[4])
+		xvalues = append(xvalues, time.Date(year, time.Month(month), day, hour, 0, 0, 0, time.UTC))
+		yvalues = append(yvalues, elapsedMillis)
+		return nil
+	})
+	if err != nil {
+		fmt.Println(err.Error())
+	}
+	return xvalues, yvalues
+}
+
+func releases() []chart.GridLine {
+	return []chart.GridLine{
+		{Value: chart.TimeToFloat64(time.Date(2016, 8, 1, 9, 30, 0, 0, time.UTC))},
+		{Value: chart.TimeToFloat64(time.Date(2016, 8, 2, 9, 30, 0, 0, time.UTC))},
+		{Value: chart.TimeToFloat64(time.Date(2016, 8, 2, 15, 30, 0, 0, time.UTC))},
+		{Value: chart.TimeToFloat64(time.Date(2016, 8, 4, 9, 30, 0, 0, time.UTC))},
+		{Value: chart.TimeToFloat64(time.Date(2016, 8, 5, 9, 30, 0, 0, time.UTC))},
+		{Value: chart.TimeToFloat64(time.Date(2016, 8, 6, 9, 30, 0, 0, time.UTC))},
+	}
+}
+
+func drawChart(log chart.Logger) http.HandlerFunc {
+	return func(res http.ResponseWriter, req *http.Request) {
+		xvalues, yvalues := readData()
+		mainSeries := chart.TimeSeries{
+			Name: "Prod Request Timings",
+			Style: chart.Style{
+				StrokeColor: chart.ColorBlue,
+				FillColor:   chart.ColorBlue.WithAlpha(100),
+			},
+			XValues: xvalues,
+			YValues: yvalues,
+		}
+
+		linreg := &chart.LinearRegressionSeries{
+			Name: "Linear Regression",
+			Style: chart.Style{
+				StrokeColor:     chart.ColorAlternateBlue,
+				StrokeDashArray: []float64{5.0, 5.0},
+			},
+			InnerSeries: mainSeries,
+		}
+
+		sma := &chart.SMASeries{
+			Name: "SMA",
+			Style: chart.Style{
+				StrokeColor:     chart.ColorRed,
+				StrokeDashArray: []float64{5.0, 5.0},
+			},
+			InnerSeries: mainSeries,
+		}
+
+		graph := chart.Chart{
+			Log:    log,
+			Width:  1280,
+			Height: 720,
+			Background: chart.Style{
+				Padding: chart.Box{
+					Top: 50,
+				},
+			},
+			YAxis: chart.YAxis{
+				Name: "Elapsed Millis",
+				TickStyle: chart.Style{
+					TextRotationDegrees: 45.0,
+				},
+				ValueFormatter: func(v interface{}) string {
+					return fmt.Sprintf("%d ms", int(v.(float64)))
+				},
+			},
+			XAxis: chart.XAxis{
+				ValueFormatter: chart.TimeHourValueFormatter,
+				GridMajorStyle: chart.Style{
+					StrokeColor: chart.ColorAlternateGray,
+					StrokeWidth: 1.0,
+				},
+				GridLines: releases(),
+			},
+			Series: []chart.Series{
+				mainSeries,
+				linreg,
+				chart.LastValueAnnotationSeries(linreg),
+				sma,
+				chart.LastValueAnnotationSeries(sma),
+			},
+		}
+
+		graph.Elements = []chart.Renderable{chart.LegendThin(&graph)}
+
+		f, _ := os.Create("output.png")
+		defer f.Close()
+		graph.Render(chart.PNG, f)
+	}
+}

examples/request_timings/requests.csv

@@ -0,0 +1,170 @@
+2016,7,31,16,51.1948264984227130
+2016,7,31,17,1.7940833333333333
+2016,7,31,18,10.0383889931207000
+2016,7,31,19,6.1413707865168539
+2016,7,31,20,8.3973734513274336
+2016,7,31,21,73.5405406633348480
+2016,7,31,22,159.8895444957152270
+2016,7,31,23,34.0708326693227090
+2016,8,1,0,69.7564325518178730
+2016,8,1,1,48.1574708470847080
+2016,8,1,2,17.4290324074074070
+2016,8,1,3,5.5943366336633663
+2016,8,1,4,9.1419949109414758
+2016,8,1,5,14.4151891117478510
+2016,8,1,6,1.5541666666666667
+2016,8,1,7,15.7282261904761900
+2016,8,1,8,21.1564157175398630
+2016,8,1,9,1.5934583333333333
+2016,8,1,10,4.3529166666666667
+2016,8,1,11,87.5080657894736840
+2016,8,1,12,1.5835000000000000
+2016,8,1,13,29.9959344262295080
+2016,8,1,14,46.8553964079538170
+2016,8,1,15,20.0111057531630460
+2016,8,1,16,94.6157284061696660
+2016,8,1,17,58.6487434362045140
+2016,8,1,18,20.8815984522785900
+2016,8,1,19,72.4154909266876360
+2016,8,1,20,58.9246686590436590
+2016,8,1,21,84.3067604562737640
+2016,8,1,22,122.5261538745387450
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examples/rerender/main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+var lock sync.Mutex
+var graph *chart.Chart
+var ts *chart.TimeSeries
+
+func addData(t time.Time, e time.Duration) {
+	lock.Lock()
+	ts.XValues = append(ts.XValues, t)
+	ts.YValues = append(ts.YValues, chart.TimeMillis(e))
+	lock.Unlock()
+}
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+	start := time.Now()
+	defer func() {
+		addData(start, time.Since(start))
+	}()
+	if len(ts.XValues) == 0 {
+		http.Error(res, "no data (yet)", http.StatusBadRequest)
+		return
+	}
+	res.Header().Set("Content-Type", "image/png")
+	if err := graph.Render(chart.PNG, res); err != nil {
+		log.Printf("%v", err)
+	}
+}
+
+func main() {
+	ts = &chart.TimeSeries{
+		XValues: []time.Time{},
+		YValues: []float64{},
+	}
+	graph = &chart.Chart{
+		Series: []chart.Series{ts},
+	}
+	http.HandleFunc("/", drawChart)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}

examples/scatter/main.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	_ "net/http/pprof"
+
+	"github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart/drawing"
+)
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+
+	viridisByY := func(xr, yr chart.Range, index int, x, y float64) drawing.Color {
+		return chart.Viridis(y, yr.GetMin(), yr.GetMax())
+	}
+
+	graph := chart.Chart{
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				Style: chart.Style{
+					StrokeWidth:      chart.Disabled,
+					DotWidth:         5,
+					DotColorProvider: viridisByY,
+				},
+				XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(0).WithEnd(127)}.Values(),
+				YValues: chart.Seq{Sequence: chart.NewRandomSequence().WithLen(128).WithMin(0).WithMax(1024)}.Values(),
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", chart.ContentTypePNG)
+	err := graph.Render(chart.PNG, res)
+	if err != nil {
+		log.Println(err.Error())
+	}
+}
+
+func unit(res http.ResponseWriter, req *http.Request) {
+	graph := chart.Chart{
+		Height: 50,
+		Width:  50,
+		Canvas: chart.Style{
+			Padding: chart.BoxZero,
+		},
+		Background: chart.Style{
+			Padding: chart.BoxZero,
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				XValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(0).WithEnd(4)}.Values(),
+				YValues: chart.Seq{Sequence: chart.NewLinearSequence().WithStart(0).WithEnd(4)}.Values(),
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", chart.ContentTypePNG)
+	err := graph.Render(chart.PNG, res)
+	if err != nil {
+		log.Println(err.Error())
+	}
+}
+
+func main() {
+	http.HandleFunc("/", drawChart)
+	http.HandleFunc("/unit", unit)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}

examples/simple_moving_average/main.go

@@ -0,0 +1,34 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+	mainSeries := chart.ContinuousSeries{
+		Name:    "A test series",
+		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.
+	// we need to use a reference because `.Render()` needs to modify state within the series.
+	smaSeries := &chart.SMASeries{
+		InnerSeries: mainSeries,
+	} // we can optionally set the `WindowSize` property which alters how the moving average is calculated.
+
+	graph := chart.Chart{
+		Series: []chart.Series{
+			mainSeries,
+			smaSeries,
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/stacked_bar/main.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+	sbc := chart.StackedBarChart{
+		Title: "Test Stacked Bar Chart",
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top: 40,
+			},
+		},
+		Height: 512,
+		Bars: []chart.StackedBar{
+			{
+				Name: "This is a very long string to test word break wrapping.",
+				Values: []chart.Value{
+					{Value: 5, Label: "Blue"},
+					{Value: 5, Label: "Green"},
+					{Value: 4, Label: "Gray"},
+					{Value: 3, Label: "Orange"},
+					{Value: 3, Label: "Test"},
+					{Value: 2, Label: "??"},
+					{Value: 1, Label: "!!"},
+				},
+			},
+			{
+				Name: "Test",
+				Values: []chart.Value{
+					{Value: 10, Label: "Blue"},
+					{Value: 5, Label: "Green"},
+					{Value: 1, Label: "Gray"},
+				},
+			},
+			{
+				Name: "Test 2",
+				Values: []chart.Value{
+					{Value: 10, Label: "Blue"},
+					{Value: 6, Label: "Green"},
+					{Value: 4, Label: "Gray"},
+				},
+			},
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	sbc.Render(chart.PNG, f)
+}

examples/stock_analysis/main.go

@@ -0,0 +1,78 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+	"time"
+
+	"github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart/drawing"
+)
+
+func main() {
+	xv, yv := xvalues(), yvalues()
+
+	priceSeries := chart.TimeSeries{
+		Name: "SPY",
+		Style: chart.Style{
+			StrokeColor: chart.GetDefaultColor(0),
+		},
+		XValues: xv,
+		YValues: yv,
+	}
+
+	smaSeries := chart.SMASeries{
+		Name: "SPY - SMA",
+		Style: chart.Style{
+			StrokeColor:     drawing.ColorRed,
+			StrokeDashArray: []float64{5.0, 5.0},
+		},
+		InnerSeries: priceSeries,
+	}
+
+	bbSeries := &chart.BollingerBandsSeries{
+		Name: "SPY - Bol. Bands",
+		Style: chart.Style{
+			StrokeColor: drawing.ColorFromHex("efefef"),
+			FillColor:   drawing.ColorFromHex("efefef").WithAlpha(64),
+		},
+		InnerSeries: priceSeries,
+	}
+
+	graph := chart.Chart{
+		XAxis: chart.XAxis{
+			TickPosition: chart.TickPositionBetweenTicks,
+		},
+		YAxis: chart.YAxis{
+			Range: &chart.ContinuousRange{
+				Max: 220.0,
+				Min: 180.0,
+			},
+		},
+		Series: []chart.Series{
+			bbSeries,
+			priceSeries,
+			smaSeries,
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}
+
+func xvalues() []time.Time {
+	rawx := []string{"2015-07-17", "2015-07-20", "2015-07-21", "2015-07-22", "2015-07-23", "2015-07-24", "2015-07-27", "2015-07-28", "2015-07-29", "2015-07-30", "2015-07-31", "2015-08-03", "2015-08-04", "2015-08-05", "2015-08-06", "2015-08-07", "2015-08-10", "2015-08-11", "2015-08-12", "2015-08-13", "2015-08-14", "2015-08-17", "2015-08-18", "2015-08-19", "2015-08-20", "2015-08-21", "2015-08-24", "2015-08-25", "2015-08-26", "2015-08-27", "2015-08-28", "2015-08-31", "2015-09-01", "2015-09-02", "2015-09-03", "2015-09-04", "2015-09-08", "2015-09-09", "2015-09-10", "2015-09-11", "2015-09-14", "2015-09-15", "2015-09-16", "2015-09-17", "2015-09-18", "2015-09-21", "2015-09-22", "2015-09-23", "2015-09-24", "2015-09-25", "2015-09-28", "2015-09-29", "2015-09-30", "2015-10-01", "2015-10-02", "2015-10-05", "2015-10-06", "2015-10-07", "2015-10-08", "2015-10-09", "2015-10-12", "2015-10-13", "2015-10-14", "2015-10-15", "2015-10-16", "2015-10-19", "2015-10-20", "2015-10-21", "2015-10-22", "2015-10-23", "2015-10-26", "2015-10-27", "2015-10-28", "2015-10-29", "2015-10-30", "2015-11-02", "2015-11-03", "2015-11-04", "2015-11-05", "2015-11-06", "2015-11-09", "2015-11-10", "2015-11-11", "2015-11-12", "2015-11-13", "2015-11-16", "2015-11-17", "2015-11-18", "2015-11-19", "2015-11-20", "2015-11-23", "2015-11-24", "2015-11-25", "2015-11-27", "2015-11-30", "2015-12-01", "2015-12-02", "2015-12-03", "2015-12-04", "2015-12-07", "2015-12-08", "2015-12-09", "2015-12-10", "2015-12-11", "2015-12-14", "2015-12-15", "2015-12-16", "2015-12-17", "2015-12-18", "2015-12-21", "2015-12-22", "2015-12-23", "2015-12-24", "2015-12-28", "2015-12-29", "2015-12-30", "2015-12-31", "2016-01-04", "2016-01-05", "2016-01-06", "2016-01-07", "2016-01-08", "2016-01-11", "2016-01-12", "2016-01-13", "2016-01-14", "2016-01-15", "2016-01-19", "2016-01-20", "2016-01-21", "2016-01-22", "2016-01-25", "2016-01-26", "2016-01-27", "2016-01-28", "2016-01-29", "2016-02-01", "2016-02-02", "2016-02-03", "2016-02-04", "2016-02-05", "2016-02-08", "2016-02-09", "2016-02-10", "2016-02-11", "2016-02-12", "2016-02-16", "2016-02-17", "2016-02-18", "2016-02-19", "2016-02-22", "2016-02-23", "2016-02-24", "2016-02-25", "2016-02-26", "2016-02-29", "2016-03-01", "2016-03-02", "2016-03-03", "2016-03-04", "2016-03-07", "2016-03-08", "2016-03-09", "2016-03-10", "2016-03-11", "2016-03-14", "2016-03-15", "2016-03-16", "2016-03-17", "2016-03-18", "2016-03-21", "2016-03-22", "2016-03-23", "2016-03-24", "2016-03-28", "2016-03-29", "2016-03-30", "2016-03-31", "2016-04-01", "2016-04-04", "2016-04-05", "2016-04-06", "2016-04-07", "2016-04-08", "2016-04-11", "2016-04-12", "2016-04-13", "2016-04-14", "2016-04-15", "2016-04-18", "2016-04-19", "2016-04-20", "2016-04-21", "2016-04-22", "2016-04-25", "2016-04-26", "2016-04-27", "2016-04-28", "2016-04-29", "2016-05-02", "2016-05-03", "2016-05-04", "2016-05-05", "2016-05-06", "2016-05-09", "2016-05-10", "2016-05-11", "2016-05-12", "2016-05-13", "2016-05-16", "2016-05-17", "2016-05-18", "2016-05-19", "2016-05-20", "2016-05-23", "2016-05-24", "2016-05-25", "2016-05-26", "2016-05-27", "2016-05-31", "2016-06-01", "2016-06-02", "2016-06-03", "2016-06-06", "2016-06-07", "2016-06-08", "2016-06-09", "2016-06-10", "2016-06-13", "2016-06-14", "2016-06-15", "2016-06-16", "2016-06-17", "2016-06-20", "2016-06-21", "2016-06-22", "2016-06-23", "2016-06-24", "2016-06-27", "2016-06-28", "2016-06-29", "2016-06-30", "2016-07-01", "2016-07-05", "2016-07-06", "2016-07-07", "2016-07-08", "2016-07-11", "2016-07-12", "2016-07-13", "2016-07-14", "2016-07-15"}
+
+	var dates []time.Time
+	for _, ts := range rawx {
+		parsed, _ := time.Parse(chart.DefaultDateFormat, ts)
+		dates = append(dates, parsed)
+	}
+	return dates
+}
+
+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}
+}

examples/text_rotation/main.go

@@ -0,0 +1,51 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart/drawing"
+)
+
+func main() {
+	f, _ := chart.GetDefaultFont()
+	r, _ := chart.PNG(1024, 1024)
+
+	chart.Draw.Text(r, "Test", 64, 64, chart.Style{
+		FontColor: drawing.ColorBlack,
+		FontSize:  18,
+		Font:      f,
+	})
+
+	chart.Draw.Text(r, "Test", 64, 64, chart.Style{
+		FontColor:           drawing.ColorBlack,
+		FontSize:            18,
+		Font:                f,
+		TextRotationDegrees: 45.0,
+	})
+
+	tb := chart.Draw.MeasureText(r, "Test", chart.Style{
+		FontColor: drawing.ColorBlack,
+		FontSize:  18,
+		Font:      f,
+	}).Shift(64, 64)
+
+	tbc := tb.Corners().Rotate(45)
+
+	chart.Draw.BoxCorners(r, tbc, chart.Style{
+		StrokeColor: drawing.ColorRed,
+		StrokeWidth: 2,
+	})
+
+	tbcb := tbc.Box()
+	chart.Draw.Box(r, tbcb, chart.Style{
+		StrokeColor: drawing.ColorBlue,
+		StrokeWidth: 2,
+	})
+
+	file, _ := os.Create("output.png")
+	defer file.Close()
+	r.Save(file)
+}

examples/timeseries/main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"net/http"
+	"time"
+
+	chart "github.com/wcharczuk/go-chart"
+)
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+	/*
+	   This is an example of using the `TimeSeries` to automatically coerce time.Time values into a continuous xrange.
+	   Note: chart.TimeSeries implements `ValueFormatterProvider` and as a result gives the XAxis the appropriate formatter to use for the ticks.
+	*/
+	graph := chart.Chart{
+		Series: []chart.Series{
+			chart.TimeSeries{
+				XValues: []time.Time{
+					time.Now().AddDate(0, 0, -10),
+					time.Now().AddDate(0, 0, -9),
+					time.Now().AddDate(0, 0, -8),
+					time.Now().AddDate(0, 0, -7),
+					time.Now().AddDate(0, 0, -6),
+					time.Now().AddDate(0, 0, -5),
+					time.Now().AddDate(0, 0, -4),
+					time.Now().AddDate(0, 0, -3),
+					time.Now().AddDate(0, 0, -2),
+					time.Now().AddDate(0, 0, -1),
+					time.Now(),
+				},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0},
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/png")
+	graph.Render(chart.PNG, res)
+}
+
+func drawCustomChart(res http.ResponseWriter, req *http.Request) {
+	/*
+	   This is basically the other timeseries example, except we switch to hour intervals and specify a different formatter from default for the xaxis tick labels.
+	*/
+	graph := chart.Chart{
+		XAxis: chart.XAxis{
+			ValueFormatter: chart.TimeHourValueFormatter,
+		},
+		Series: []chart.Series{
+			chart.TimeSeries{
+				XValues: []time.Time{
+					time.Now().Add(-10 * time.Hour),
+					time.Now().Add(-9 * time.Hour),
+					time.Now().Add(-8 * time.Hour),
+					time.Now().Add(-7 * time.Hour),
+					time.Now().Add(-6 * time.Hour),
+					time.Now().Add(-5 * time.Hour),
+					time.Now().Add(-4 * time.Hour),
+					time.Now().Add(-3 * time.Hour),
+					time.Now().Add(-2 * time.Hour),
+					time.Now().Add(-1 * time.Hour),
+					time.Now(),
+				},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0},
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/png")
+	graph.Render(chart.PNG, res)
+}
+
+func main() {
+	http.HandleFunc("/", drawChart)
+	http.HandleFunc("/favicon.ico", func(res http.ResponseWriter, req *http.Request) {
+		res.Write([]byte{})
+	})
+	http.HandleFunc("/custom", drawCustomChart)
+	http.ListenAndServe(":8080", nil)
+}

examples/twoaxis/main.go

@@ -0,0 +1,45 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+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.
+
+	   We also enable all of the axes by setting the `Show` propery of their respective styles to `true`.
+	*/
+
+	graph := chart.Chart{
+		XAxis: chart.XAxis{
+			TickPosition: chart.TickPositionBetweenTicks,
+			ValueFormatter: func(v interface{}) string {
+				typed := v.(float64)
+				typedDate := chart.TimeFromFloat64(typed)
+				return fmt.Sprintf("%d-%d\n%d", typedDate.Month(), typedDate.Day(), typedDate.Year())
+			},
+		},
+		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},
+			},
+			chart.ContinuousSeries{
+				YAxis:   chart.YAxisSecondary,
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{50.0, 40.0, 30.0, 20.0, 10.0},
+			},
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}

examples/twopoint/main.go

@@ -0,0 +1,63 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"bytes"
+	"log"
+	"os"
+
+	"github.com/wcharczuk/go-chart"
+)
+
+func main() {
+	var b float64
+	b = 1000
+
+	ts1 := chart.ContinuousSeries{ //TimeSeries{
+		Name:    "Time Series",
+		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{
+			StrokeColor: chart.GetDefaultColor(1),
+		},
+
+		XValues: []float64{10 * b, 20 * b, 30 * b, 40 * b, 50 * b, 60 * b, 70 * b, 80 * b},
+		YValues: []float64{15.0, 52.0, 30.0, 42.0, 50.0, 26.0, 77.0, 38.0},
+	}
+
+	graph := chart.Chart{
+
+		XAxis: chart.XAxis{
+			Name:           "The XAxis",
+			ValueFormatter: chart.TimeMinuteValueFormatter, //TimeHourValueFormatter,
+		},
+
+		YAxis: chart.YAxis{
+			Name: "The YAxis",
+		},
+
+		Series: []chart.Series{
+			ts1,
+			ts2,
+		},
+	}
+
+	buffer := bytes.NewBuffer([]byte{})
+	err := graph.Render(chart.PNG, buffer)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	fo, err := os.Create("output.png")
+	if err != nil {
+		panic(err)
+	}
+
+	if _, err := fo.Write(buffer.Bytes()); err != nil {
+		panic(err)
+	}
+}