merging master
This commit is contained in:
Will Charczuk
commit
2d5aeaf824
8 changed files with 494 additions and 17 deletions
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@ -18,7 +18,8 @@ func inlineSVGWithClasses(res http.ResponseWriter, req *http.Request) {
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"<body>"))
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pie := chart.PieChart{
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// Note that setting ClassName will cause all other inline styles to be dropped!
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// Notes: * Setting ClassName will cause all other inline styles to be dropped!
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// * The following type classes may be added additionally: stroke, fill, text
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Background: chart.Style{ClassName: "background"},
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Canvas: chart.Style{
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ClassName: "canvas",
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@ -43,12 +44,12 @@ func css(res http.ResponseWriter, req *http.Request) {
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res.Header().Set("Content-Type", "text/css")
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res.Write([]byte("svg .background { fill: white; }" +
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"svg .canvas { fill: white; }" +
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"svg path.blue { fill: blue; stroke: lightblue; }" +
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"svg path.green { fill: green; stroke: lightgreen; }" +
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"svg path.gray { fill: gray; stroke: lightgray; }" +
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"svg text.blue { fill: white; }" +
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"svg text.green { fill: white; }" +
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"svg text.gray { fill: white; }"))
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"svg .blue.fill.stroke { fill: blue; stroke: lightblue; }" +
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"svg .green.fill.stroke { fill: green; stroke: lightgreen; }" +
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"svg .gray.fill.stroke { fill: gray; stroke: lightgray; }" +
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"svg .blue.text { fill: white; }" +
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"svg .green.text { fill: white; }" +
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"svg .gray.text { fill: white; }"))
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}
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func main() {
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@ -5,17 +5,17 @@ import (
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"log"
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"net/http"
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chart "github.com/wcharczuk/go-chart"
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"github.com/wcharczuk/go-chart"
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)
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const style = "svg .background { fill: white; }" +
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"svg .canvas { fill: white; }" +
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"svg path.blue { fill: blue; stroke: lightblue; }" +
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"svg path.green { fill: green; stroke: lightgreen; }" +
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"svg path.gray { fill: gray; stroke: lightgray; }" +
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"svg text.blue { fill: white; }" +
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"svg text.green { fill: white; }" +
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"svg text.gray { fill: white; }"
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"svg .blue.fill.stroke { fill: blue; stroke: lightblue; }" +
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"svg .green.fill.stroke { fill: green; stroke: lightgreen; }" +
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"svg .gray.fill.stroke { fill: gray; stroke: lightgray; }" +
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"svg .blue.text { fill: white; }" +
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"svg .green.text { fill: white; }" +
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"svg .gray.text { fill: white; }"
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func svgWithCustomInlineCSS(res http.ResponseWriter, _ *http.Request) {
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res.Header().Set("Content-Type", chart.ContentTypeSVG)
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54
_examples/donut_chart/main.go
Normal file
54
_examples/donut_chart/main.go
Normal file
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@ -0,0 +1,54 @@
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package main
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import (
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"fmt"
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"log"
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"net/http"
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"github.com/wcharczuk/go-chart"
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)
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func drawChart(res http.ResponseWriter, req *http.Request) {
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pie := chart.DonutChart{
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Width: 512,
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Height: 512,
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Values: []chart.Value{
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{Value: 5, Label: "Blue"},
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{Value: 5, Label: "Green"},
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{Value: 4, Label: "Gray"},
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{Value: 4, Label: "Orange"},
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{Value: 3, Label: "Deep Blue"},
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{Value: 3, Label: "test"},
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},
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}
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res.Header().Set("Content-Type", "image/png")
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err := pie.Render(chart.PNG, res)
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if err != nil {
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fmt.Printf("Error rendering pie chart: %v\n", err)
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}
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}
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func drawChartRegression(res http.ResponseWriter, req *http.Request) {
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pie := chart.DonutChart{
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Width: 512,
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Height: 512,
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Values: []chart.Value{
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{Value: 5, Label: "Blue"},
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{Value: 2, Label: "Two"},
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{Value: 1, Label: "One"},
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},
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}
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res.Header().Set("Content-Type", chart.ContentTypeSVG)
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err := pie.Render(chart.SVG, res)
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if err != nil {
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fmt.Printf("Error rendering pie chart: %v\n", err)
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}
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}
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func main() {
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http.HandleFunc("/", drawChart)
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http.HandleFunc("/reg", drawChartRegression)
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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BIN
_examples/donut_chart/output.png
Normal file
BIN
_examples/donut_chart/output.png
Normal file
Binary file not shown.
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After Width: | Height: | Size: 24 KiB |
25
_examples/donut_chart/reg.svg
Normal file
25
_examples/donut_chart/reg.svg
Normal file
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@ -0,0 +1,25 @@
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<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
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L 512 0
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L 512 512
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L 0 512
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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
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L 507 5
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L 507 507
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L 5 507
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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
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L 438 256
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A 182 182 225.00 1 1 127 127
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L 256 256
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Z" style="stroke-width:4;stroke:rgba(255,255,255,1.0);fill:rgba(106,195,203,1.0)"/><path d="M 256 256
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L 127 127
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A 182 182 90.00 0 1 385 127
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L 256 256
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Z" style="stroke-width:4;stroke:rgba(255,255,255,1.0);fill:rgba(42,190,137,1.0)"/><path d="M 256 256
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L 385 127
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A 182 182 45.00 0 1 438 256
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L 256 256
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Z" style="stroke-width:4;stroke:rgba(255,255,255,1.0);fill:rgba(110,128,139,1.0)"/><path d="M 256 256
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L 321 256
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A 65 65 359.00 1 1 321 255
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L 256 256
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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>
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After Width: | Height: | Size: 1.4 KiB |
315
donut_chart.go
Normal file
315
donut_chart.go
Normal file
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@ -0,0 +1,315 @@
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package chart
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import (
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"errors"
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"fmt"
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"io"
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"github.com/golang/freetype/truetype"
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)
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// DonutChart is a chart that draws sections of a circle based on percentages with an hole.
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type DonutChart struct {
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Title string
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TitleStyle Style
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ColorPalette ColorPalette
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Width int
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Height int
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DPI float64
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Background Style
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Canvas Style
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SliceStyle Style
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Font *truetype.Font
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defaultFont *truetype.Font
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Values []Value
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Elements []Renderable
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}
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// GetDPI returns the dpi for the chart.
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func (pc DonutChart) GetDPI(defaults ...float64) float64 {
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if pc.DPI == 0 {
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if len(defaults) > 0 {
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return defaults[0]
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}
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return DefaultDPI
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}
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return pc.DPI
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}
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// GetFont returns the text font.
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func (pc DonutChart) GetFont() *truetype.Font {
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if pc.Font == nil {
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return pc.defaultFont
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}
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return pc.Font
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}
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// GetWidth returns the chart width or the default value.
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func (pc DonutChart) GetWidth() int {
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if pc.Width == 0 {
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return DefaultChartWidth
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}
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return pc.Width
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}
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// GetHeight returns the chart height or the default value.
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func (pc DonutChart) GetHeight() int {
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if pc.Height == 0 {
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return DefaultChartWidth
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}
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return pc.Height
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}
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// Render renders the chart with the given renderer to the given io.Writer.
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func (pc DonutChart) Render(rp RendererProvider, w io.Writer) error {
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if len(pc.Values) == 0 {
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return errors.New("please provide at least one value")
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}
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r, err := rp(pc.GetWidth(), pc.GetHeight())
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if err != nil {
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return err
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}
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if pc.Font == nil {
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defaultFont, err := GetDefaultFont()
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if err != nil {
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return err
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}
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pc.defaultFont = defaultFont
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}
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r.SetDPI(pc.GetDPI(DefaultDPI))
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canvasBox := pc.getDefaultCanvasBox()
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canvasBox = pc.getCircleAdjustedCanvasBox(canvasBox)
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pc.drawBackground(r)
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pc.drawCanvas(r, canvasBox)
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finalValues, err := pc.finalizeValues(pc.Values)
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if err != nil {
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return err
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}
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pc.drawSlices(r, canvasBox, finalValues)
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pc.drawTitle(r)
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for _, a := range pc.Elements {
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a(r, canvasBox, pc.styleDefaultsElements())
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}
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return r.Save(w)
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}
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func (pc DonutChart) drawBackground(r Renderer) {
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Draw.Box(r, Box{
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Right: pc.GetWidth(),
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Bottom: pc.GetHeight(),
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}, pc.getBackgroundStyle())
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}
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func (pc DonutChart) drawCanvas(r Renderer, canvasBox Box) {
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Draw.Box(r, canvasBox, pc.getCanvasStyle())
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}
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func (pc DonutChart) drawTitle(r Renderer) {
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if len(pc.Title) > 0 && !pc.TitleStyle.Hidden {
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Draw.TextWithin(r, pc.Title, pc.Box(), pc.styleDefaultsTitle())
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}
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}
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func (pc DonutChart) drawSlices(r Renderer, canvasBox Box, values []Value) {
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cx, cy := canvasBox.Center()
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diameter := MinInt(canvasBox.Width(), canvasBox.Height())
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radius := float64(diameter>>1) / 1.1
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labelRadius := (radius * 2.83) / 3.0
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// draw the donut slices
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var rads, delta, delta2, total float64
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var lx, ly int
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if len(values) == 1 {
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pc.styleDonutChartValue(0).WriteToRenderer(r)
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r.MoveTo(cx, cy)
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r.Circle(radius, cx, cy)
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} else {
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for index, v := range values {
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v.Style.InheritFrom(pc.styleDonutChartValue(index)).WriteToRenderer(r)
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r.MoveTo(cx, cy)
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rads = PercentToRadians(total)
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delta = PercentToRadians(v.Value)
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r.ArcTo(cx, cy, (radius / 1.25), (radius / 1.25), rads, delta)
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r.LineTo(cx, cy)
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r.Close()
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r.FillStroke()
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total = total + v.Value
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}
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}
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//making the donut hole
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v := Value{Value: 100, Label: "center"}
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styletemp := pc.SliceStyle.InheritFrom(Style{
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StrokeColor: ColorWhite, StrokeWidth: 4.0, FillColor: ColorWhite, FontColor: ColorWhite, //Font: pc.GetFont(),//FontSize: pc.getScaledFontSize(),
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})
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v.Style.InheritFrom(styletemp).WriteToRenderer(r)
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r.MoveTo(cx, cy)
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r.ArcTo(cx, cy, (radius / 3.5), (radius / 3.5), DegreesToRadians(0), DegreesToRadians(359))
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r.LineTo(cx, cy)
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r.Close()
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r.FillStroke()
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// draw the labels
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total = 0
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for index, v := range values {
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v.Style.InheritFrom(pc.styleDonutChartValue(index)).WriteToRenderer(r)
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if len(v.Label) > 0 {
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delta2 = PercentToRadians(total + (v.Value / 2.0))
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delta2 = RadianAdd(delta2, _pi2)
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lx, ly = CirclePoint(cx, cy, labelRadius, delta2)
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tb := r.MeasureText(v.Label)
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lx = lx - (tb.Width() >> 1)
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ly = ly + (tb.Height() >> 1)
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r.Text(v.Label, lx, ly)
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}
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total = total + v.Value
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}
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}
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func (pc DonutChart) finalizeValues(values []Value) ([]Value, error) {
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finalValues := Values(values).Normalize()
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if len(finalValues) == 0 {
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return nil, fmt.Errorf("donut chart must contain at least (1) non-zero value")
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}
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return finalValues, nil
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}
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func (pc DonutChart) getDefaultCanvasBox() Box {
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return pc.Box()
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}
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func (pc DonutChart) getCircleAdjustedCanvasBox(canvasBox Box) Box {
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circleDiameter := MinInt(canvasBox.Width(), canvasBox.Height())
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square := Box{
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Right: circleDiameter,
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Bottom: circleDiameter,
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}
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return canvasBox.Fit(square)
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}
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func (pc DonutChart) getBackgroundStyle() Style {
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return pc.Background.InheritFrom(pc.styleDefaultsBackground())
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}
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func (pc DonutChart) getCanvasStyle() Style {
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return pc.Canvas.InheritFrom(pc.styleDefaultsCanvas())
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}
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func (pc DonutChart) styleDefaultsCanvas() Style {
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return Style{
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FillColor: pc.GetColorPalette().CanvasColor(),
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StrokeColor: pc.GetColorPalette().CanvasStrokeColor(),
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StrokeWidth: DefaultStrokeWidth,
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}
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}
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func (pc DonutChart) styleDefaultsDonutChartValue() Style {
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return Style{
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StrokeColor: pc.GetColorPalette().TextColor(),
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StrokeWidth: 4.0,
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FillColor: pc.GetColorPalette().TextColor(),
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}
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}
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func (pc DonutChart) styleDonutChartValue(index int) Style {
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return pc.SliceStyle.InheritFrom(Style{
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StrokeColor: ColorWhite,
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StrokeWidth: 4.0,
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FillColor: pc.GetColorPalette().GetSeriesColor(index),
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FontSize: pc.getScaledFontSize(),
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FontColor: pc.GetColorPalette().TextColor(),
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Font: pc.GetFont(),
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})
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}
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func (pc DonutChart) getScaledFontSize() float64 {
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effectiveDimension := MinInt(pc.GetWidth(), pc.GetHeight())
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if effectiveDimension >= 2048 {
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return 48.0
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} else if effectiveDimension >= 1024 {
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return 24.0
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} else if effectiveDimension > 512 {
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return 18.0
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} else if effectiveDimension > 256 {
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return 12.0
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}
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return 10.0
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}
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func (pc DonutChart) styleDefaultsBackground() Style {
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return Style{
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FillColor: pc.GetColorPalette().BackgroundColor(),
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StrokeColor: pc.GetColorPalette().BackgroundStrokeColor(),
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StrokeWidth: DefaultStrokeWidth,
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}
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}
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func (pc DonutChart) styleDefaultsElements() Style {
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return Style{
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Font: pc.GetFont(),
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}
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}
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func (pc DonutChart) styleDefaultsTitle() Style {
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return pc.TitleStyle.InheritFrom(Style{
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FontColor: pc.GetColorPalette().TextColor(),
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Font: pc.GetFont(),
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FontSize: pc.getTitleFontSize(),
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TextHorizontalAlign: TextHorizontalAlignCenter,
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TextVerticalAlign: TextVerticalAlignTop,
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TextWrap: TextWrapWord,
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})
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}
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func (pc DonutChart) getTitleFontSize() float64 {
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effectiveDimension := MinInt(pc.GetWidth(), pc.GetHeight())
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if effectiveDimension >= 2048 {
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return 48
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} else if effectiveDimension >= 1024 {
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return 24
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} else if effectiveDimension >= 512 {
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return 18
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} else if effectiveDimension >= 256 {
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return 12
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}
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return 10
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}
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// GetColorPalette returns the color palette for the chart.
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func (pc DonutChart) GetColorPalette() ColorPalette {
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if pc.ColorPalette != nil {
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return pc.ColorPalette
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}
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return AlternateColorPalette
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}
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// Box returns the chart bounds as a box.
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func (pc DonutChart) Box() Box {
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dpr := pc.Background.Padding.GetRight(DefaultBackgroundPadding.Right)
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dpb := pc.Background.Padding.GetBottom(DefaultBackgroundPadding.Bottom)
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return Box{
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Top: pc.Background.Padding.GetTop(DefaultBackgroundPadding.Top),
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Left: pc.Background.Padding.GetLeft(DefaultBackgroundPadding.Left),
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Right: pc.GetWidth() - dpr,
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Bottom: pc.GetHeight() - dpb,
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}
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}
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69
donut_chart_test.go
Normal file
69
donut_chart_test.go
Normal file
|
|
@ -0,0 +1,69 @@
|
|||
package chart
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"testing"
|
||||
|
||||
"github.com/blend/go-sdk/assert"
|
||||
)
|
||||
|
||||
func TestDonutChart(t *testing.T) {
|
||||
assert := assert.New(t)
|
||||
|
||||
pie := DonutChart{
|
||||
Canvas: Style{
|
||||
FillColor: ColorLightGray,
|
||||
},
|
||||
Values: []Value{
|
||||
{Value: 10, Label: "Blue"},
|
||||
{Value: 9, Label: "Green"},
|
||||
{Value: 8, Label: "Gray"},
|
||||
{Value: 7, Label: "Orange"},
|
||||
{Value: 6, Label: "HEANG"},
|
||||
{Value: 5, Label: "??"},
|
||||
{Value: 2, Label: "!!"},
|
||||
},
|
||||
}
|
||||
|
||||
b := bytes.NewBuffer([]byte{})
|
||||
pie.Render(PNG, b)
|
||||
assert.NotZero(b.Len())
|
||||
}
|
||||
|
||||
func TestDonutChartDropsZeroValues(t *testing.T) {
|
||||
assert := assert.New(t)
|
||||
|
||||
pie := DonutChart{
|
||||
Canvas: Style{
|
||||
FillColor: ColorLightGray,
|
||||
},
|
||||
Values: []Value{
|
||||
{Value: 5, Label: "Blue"},
|
||||
{Value: 5, Label: "Green"},
|
||||
{Value: 0, Label: "Gray"},
|
||||
},
|
||||
}
|
||||
|
||||
b := bytes.NewBuffer([]byte{})
|
||||
err := pie.Render(PNG, b)
|
||||
assert.Nil(err)
|
||||
}
|
||||
|
||||
func TestDonutChartAllZeroValues(t *testing.T) {
|
||||
assert := assert.New(t)
|
||||
|
||||
pie := DonutChart{
|
||||
Canvas: Style{
|
||||
FillColor: ColorLightGray,
|
||||
},
|
||||
Values: []Value{
|
||||
{Value: 0, Label: "Blue"},
|
||||
{Value: 0, Label: "Green"},
|
||||
{Value: 0, Label: "Gray"},
|
||||
},
|
||||
}
|
||||
|
||||
b := bytes.NewBuffer([]byte{})
|
||||
err := pie.Render(PNG, b)
|
||||
assert.NotNil(err)
|
||||
}
|
||||
|
|
@ -310,15 +310,28 @@ func (c *canvas) getFontFace(s Style) string {
|
|||
|
||||
// styleAsSVG returns the style as a svg style or class string.
|
||||
func (c *canvas) styleAsSVG(s Style) string {
|
||||
if s.ClassName != "" {
|
||||
return fmt.Sprintf("class=\"%s\"", s.ClassName)
|
||||
}
|
||||
sw := s.StrokeWidth
|
||||
sc := s.StrokeColor
|
||||
fc := s.FillColor
|
||||
fs := s.FontSize
|
||||
fnc := s.FontColor
|
||||
|
||||
if s.ClassName != "" {
|
||||
var classes []string
|
||||
classes = append(classes, s.ClassName)
|
||||
if !sc.IsZero() {
|
||||
classes = append(classes, "stroke")
|
||||
}
|
||||
if !fc.IsZero() {
|
||||
classes = append(classes, "fill")
|
||||
}
|
||||
if fs != 0 || s.Font != nil {
|
||||
classes = append(classes, "text")
|
||||
}
|
||||
|
||||
return fmt.Sprintf("class=\"%s\"", strings.Join(classes, " "))
|
||||
}
|
||||
|
||||
var pieces []string
|
||||
|
||||
if sw != 0 {
|
||||
|
|
|
|||
Loading…
Reference in a new issue