basics of stacked bar.
This commit is contained in:
parent
020ec8f4a4
commit
a1fb284797
8 changed files with 272 additions and 25 deletions
2
chart.go
2
chart.go
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@ -463,7 +463,7 @@ func (c Chart) styleDefaultsCanvas() Style {
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}
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func (c Chart) styleDefaultsSeries(seriesIndex int) Style {
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strokeColor := GetDefaultSeriesStrokeColor(seriesIndex)
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strokeColor := GetDefaultColor(seriesIndex)
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return Style{
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StrokeColor: strokeColor,
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StrokeWidth: DefaultStrokeWidth,
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@ -159,16 +159,16 @@ var (
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DashArrayDashesLarge = []int{10, 10}
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)
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// GetDefaultSeriesStrokeColor returns a color from the default list by index.
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// GetDefaultColor returns a color from the default list by index.
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// NOTE: the index will wrap around (using a modulo).
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func GetDefaultSeriesStrokeColor(index int) drawing.Color {
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func GetDefaultColor(index int) drawing.Color {
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finalIndex := index % len(DefaultColors)
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return DefaultColors[finalIndex]
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}
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// GetDefaultPieChartValueColor returns a color from the default list by index.
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// GetAlternateColor returns a color from the default list by index.
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// NOTE: the index will wrap around (using a modulo).
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func GetDefaultPieChartValueColor(index int) drawing.Color {
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func GetAlternateColor(index int) drawing.Color {
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finalIndex := index % len(DefaultAlternateColors)
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return DefaultAlternateColors[finalIndex]
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}
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@ -14,13 +14,13 @@ func drawChart(res http.ResponseWriter, req *http.Request) {
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FillColor: chart.ColorLightGray,
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},
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Values: []chart.Value{
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{Value: 10, Label: "Blue"},
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{Value: 9, Label: "Green"},
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{Value: 8, Label: "Gray"},
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{Value: 7, Label: "Orange"},
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{Value: 6, Label: "HEANG"},
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{Value: 5, Label: "??"},
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{Value: 2, Label: "!!"},
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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: "Test"},
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{Value: 3, Label: "??"},
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{Value: 1, Label: "!!"},
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},
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}
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48
examples/stacked_bar/main.go
Normal file
48
examples/stacked_bar/main.go
Normal file
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@ -0,0 +1,48 @@
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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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sbc := chart.StackedBarChart{
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Background: chart.Style{
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Padding: chart.Box{Top: 50, Left: 50, Right: 50, Bottom: 50},
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},
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Bars: []chart.StackedBar{
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{
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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: "Test"},
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{Value: 3, Label: "??"},
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{Value: 1, Label: "!!"},
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},
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},
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{
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Values: []chart.Value{
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{Value: 10, Label: "Blue"},
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{Value: 5, Label: "Green"},
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{Value: 1, Label: "Gray"},
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},
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},
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},
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}
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res.Header().Set("Content-Type", "image/svg+xml")
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err := sbc.Render(chart.SVG, res)
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if err != nil {
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fmt.Printf("Error rendering 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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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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12
pie_chart.go
12
pie_chart.go
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@ -217,7 +217,7 @@ func (pc PieChart) stylePieChartValue(index int) Style {
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return Style{
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StrokeColor: ColorWhite,
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StrokeWidth: 5.0,
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FillColor: GetDefaultPieChartValueColor(index),
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FillColor: GetAlternateColor(index),
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FontSize: 24.0,
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FontColor: ColorWhite,
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Font: pc.GetFont(),
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@ -232,16 +232,6 @@ func (pc PieChart) styleDefaultsBackground() Style {
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}
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}
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func (pc PieChart) styleDefaultsSeries(seriesIndex int) Style {
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strokeColor := GetDefaultSeriesStrokeColor(seriesIndex)
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return Style{
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StrokeColor: strokeColor,
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StrokeWidth: DefaultStrokeWidth,
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Font: pc.GetFont(),
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FontSize: DefaultFontSize,
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}
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}
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func (pc PieChart) styleDefaultsElements() Style {
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return Style{
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Font: pc.GetFont(),
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209
stacked_bar_chart.go
Normal file
209
stacked_bar_chart.go
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@ -0,0 +1,209 @@
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package chart
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import (
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"errors"
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"io"
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"github.com/golang/freetype/truetype"
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)
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// StackedBar is a bar within a StackedBarChart.
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type StackedBar struct {
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Name string
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Width int
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Values []Value
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}
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// GetWidth returns the width of the bar.
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func (sb StackedBar) GetWidth() int {
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if sb.Width == 0 {
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return 20
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}
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return sb.Width
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}
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// StackedBarChart is a chart that draws sections of a bar based on percentages.
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type StackedBarChart struct {
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Title string
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TitleStyle Style
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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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BarSpacing int
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Font *truetype.Font
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defaultFont *truetype.Font
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Bars []StackedBar
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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 (sbc StackedBarChart) GetDPI(defaults ...float64) float64 {
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if sbc.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 sbc.DPI
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}
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// GetFont returns the text font.
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func (sbc StackedBarChart) GetFont() *truetype.Font {
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if sbc.Font == nil {
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return sbc.defaultFont
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}
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return sbc.Font
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}
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// GetWidth returns the chart width or the default value.
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func (sbc StackedBarChart) GetWidth() int {
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if sbc.Width == 0 {
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return DefaultChartWidth
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}
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return sbc.Width
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}
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// GetHeight returns the chart height or the default value.
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func (sbc StackedBarChart) GetHeight() int {
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if sbc.Height == 0 {
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return DefaultChartWidth
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}
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return sbc.Height
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}
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// GetBarSpacing returns the spacing between bars.
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func (sbc StackedBarChart) GetBarSpacing() int {
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if sbc.BarSpacing == 0 {
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return 100
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}
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return sbc.BarSpacing
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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 (sbc StackedBarChart) Render(rp RendererProvider, w io.Writer) error {
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if len(sbc.Bars) == 0 {
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return errors.New("Please provide at least one bar.")
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}
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r, err := rp(sbc.GetWidth(), sbc.GetHeight())
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if err != nil {
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return err
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}
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if sbc.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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sbc.defaultFont = defaultFont
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}
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r.SetDPI(sbc.GetDPI(DefaultDPI))
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canvasBox := sbc.getAdjustedCanvasBox(sbc.getDefaultCanvasBox())
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sbc.drawBars(r, canvasBox)
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sbc.drawTitle(r)
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for _, a := range sbc.Elements {
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a(r, canvasBox, sbc.styleDefaultsElements())
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}
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return r.Save(w)
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}
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func (sbc StackedBarChart) drawBars(r Renderer, canvasBox Box) {
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xoffset := canvasBox.Left
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for _, bar := range sbc.Bars {
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sbc.drawBar(r, canvasBox, xoffset, bar)
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xoffset += sbc.GetBarSpacing()
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}
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}
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func (sbc StackedBarChart) drawBar(r Renderer, canvasBox Box, xoffset int, bar StackedBar) int {
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bxl := xoffset
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bxr := xoffset + bar.GetWidth()
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normalizedBarComponents := Values(bar.Values).Normalize()
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yoffset := canvasBox.Top
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for index, bv := range normalizedBarComponents {
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barHeight := int(bv.Value * float64(canvasBox.Height()))
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barBox := Box{Top: yoffset, Left: bxl, Right: bxr, Bottom: yoffset + barHeight}
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DrawBox(r, barBox, bv.Style.InheritFrom(sbc.styleDefaultsStackedBarValue(index)))
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yoffset += barHeight
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}
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return bxr
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}
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func (sbc StackedBarChart) drawTitle(r Renderer) {
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if len(sbc.Title) > 0 && sbc.TitleStyle.Show {
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r.SetFont(sbc.TitleStyle.GetFont(sbc.GetFont()))
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r.SetFontColor(sbc.TitleStyle.GetFontColor(DefaultTextColor))
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titleFontSize := sbc.TitleStyle.GetFontSize(DefaultTitleFontSize)
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r.SetFontSize(titleFontSize)
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textBox := r.MeasureText(sbc.Title)
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textWidth := textBox.Width()
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textHeight := textBox.Height()
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titleX := (sbc.GetWidth() >> 1) - (textWidth >> 1)
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titleY := sbc.TitleStyle.Padding.GetTop(DefaultTitleTop) + textHeight
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r.Text(sbc.Title, titleX, titleY)
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}
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}
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func (sbc StackedBarChart) getDefaultCanvasBox() Box {
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return sbc.Box()
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}
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func (sbc StackedBarChart) getAdjustedCanvasBox(canvasBox Box) Box {
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var totalWidth int
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for index, bar := range sbc.Bars {
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totalWidth += bar.GetWidth()
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if index < len(sbc.Bars)-1 {
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totalWidth += sbc.GetBarSpacing()
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}
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}
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return canvasBox.OuterConstrain(sbc.Box(), Box{
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Top: canvasBox.Top,
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Left: canvasBox.Left,
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Right: canvasBox.Left + totalWidth,
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Bottom: canvasBox.Bottom,
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})
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}
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// Box returns the chart bounds as a box.
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func (sbc StackedBarChart) Box() Box {
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dpr := sbc.Background.Padding.GetRight(DefaultBackgroundPadding.Right)
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dpb := sbc.Background.Padding.GetBottom(DefaultBackgroundPadding.Bottom)
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return Box{
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Top: sbc.Background.Padding.GetTop(DefaultBackgroundPadding.Top),
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Left: sbc.Background.Padding.GetLeft(DefaultBackgroundPadding.Left),
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Right: sbc.GetWidth() - dpr,
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Bottom: sbc.GetHeight() - dpb,
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}
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}
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func (sbc StackedBarChart) styleDefaultsStackedBarValue(index int) Style {
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return Style{
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StrokeColor: GetAlternateColor(index),
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StrokeWidth: 3.0,
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FillColor: GetAlternateColor(index),
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}
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}
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func (sbc StackedBarChart) styleDefaultsElements() Style {
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return Style{
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Font: sbc.GetFont(),
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}
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}
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2
util.go
2
util.go
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@ -109,7 +109,7 @@ func Normalize(values ...float64) []float64 {
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}
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output := make([]float64, len(values))
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for x, v := range values {
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output[x] = RoundDown(v/total, 0.001)
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output[x] = RoundDown(v/total, 0.00001)
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}
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return output
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}
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2
value.go
2
value.go
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@ -32,7 +32,7 @@ func (vs Values) Normalize() []Value {
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output[index] = Value{
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Style: v.Style,
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Label: v.Label,
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Value: RoundDown(v.Value/total, 0.001),
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Value: RoundDown(v.Value/total, 0.00001),
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}
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}
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return output
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