335 lines
8.1 KiB
Go
335 lines
8.1 KiB
Go
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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"math"
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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 50
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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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XAxis Style
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YAxis 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(r, sbc.getDefaultCanvasBox())
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sbc.drawBars(r, canvasBox)
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sbc.drawXAxis(r, canvasBox)
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sbc.drawYAxis(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() + bar.GetWidth())
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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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barSpacing2 := sbc.GetBarSpacing() >> 1
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bxl := xoffset + barSpacing2
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bxr := bxl + 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(math.Ceil(bv.Value * float64(canvasBox.Height())))
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barBox := Box{
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Top: yoffset,
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Left: bxl,
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Right: bxr,
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Bottom: Math.MinInt(yoffset+barHeight, canvasBox.Bottom-DefaultStrokeWidth),
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}
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Draw.Box(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) drawXAxis(r Renderer, canvasBox Box) {
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if sbc.XAxis.Show {
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axisStyle := sbc.XAxis.InheritFrom(sbc.styleDefaultsAxes())
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axisStyle.WriteToRenderer(r)
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r.MoveTo(canvasBox.Left, canvasBox.Bottom)
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r.LineTo(canvasBox.Right, canvasBox.Bottom)
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r.Stroke()
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r.MoveTo(canvasBox.Left, canvasBox.Bottom)
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r.LineTo(canvasBox.Left, canvasBox.Bottom+DefaultVerticalTickHeight)
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r.Stroke()
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cursor := canvasBox.Left
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for _, bar := range sbc.Bars {
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barLabelBox := Box{
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Top: canvasBox.Bottom + DefaultXAxisMargin,
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Left: cursor,
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Right: cursor + bar.GetWidth() + sbc.GetBarSpacing(),
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Bottom: sbc.GetHeight(),
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}
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if len(bar.Name) > 0 {
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Draw.TextWithin(r, bar.Name, barLabelBox, axisStyle)
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}
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axisStyle.WriteToRenderer(r)
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r.MoveTo(barLabelBox.Right, canvasBox.Bottom)
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r.LineTo(barLabelBox.Right, canvasBox.Bottom+DefaultVerticalTickHeight)
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r.Stroke()
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cursor += bar.GetWidth() + sbc.GetBarSpacing()
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}
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}
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}
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func (sbc StackedBarChart) drawYAxis(r Renderer, canvasBox Box) {
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if sbc.YAxis.Show {
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axisStyle := sbc.YAxis.InheritFrom(sbc.styleDefaultsAxes())
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axisStyle.WriteToRenderer(r)
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r.MoveTo(canvasBox.Right, canvasBox.Top)
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r.LineTo(canvasBox.Right, canvasBox.Bottom)
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r.Stroke()
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r.MoveTo(canvasBox.Right, canvasBox.Bottom)
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r.LineTo(canvasBox.Right+DefaultHorizontalTickWidth, canvasBox.Bottom)
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r.Stroke()
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ticks := Generate.Float64(1.0, 0.0, 0.2)
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for _, t := range ticks {
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axisStyle.GetStrokeOptions().WriteToRenderer(r)
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ty := canvasBox.Bottom - int(t*float64(canvasBox.Height()))
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r.MoveTo(canvasBox.Right, ty)
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r.LineTo(canvasBox.Right+DefaultHorizontalTickWidth, ty)
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r.Stroke()
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axisStyle.GetTextOptions().WriteToRenderer(r)
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text := fmt.Sprintf("%0.0f%%", t*100)
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tb := r.MeasureText(text)
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Draw.Text(r, text, canvasBox.Right+DefaultYAxisMargin+5, ty+(tb.Height()>>1), axisStyle)
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}
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}
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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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Draw.TextWithin(r, sbc.Title, sbc.Box(), sbc.styleDefaultsTitle())
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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(r Renderer, canvasBox Box) Box {
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var totalWidth int
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for _, bar := range sbc.Bars {
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totalWidth += bar.GetWidth() + sbc.GetBarSpacing()
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}
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if sbc.XAxis.Show {
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xaxisHeight := DefaultVerticalTickHeight
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axisStyle := sbc.XAxis.InheritFrom(sbc.styleDefaultsAxes())
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axisStyle.WriteToRenderer(r)
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cursor := canvasBox.Left
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for _, bar := range sbc.Bars {
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if len(bar.Name) > 0 {
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barLabelBox := Box{
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Top: canvasBox.Bottom + DefaultXAxisMargin,
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Left: cursor,
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Right: cursor + bar.GetWidth() + sbc.GetBarSpacing(),
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Bottom: sbc.GetHeight(),
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}
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lines := Text.WrapFit(r, bar.Name, barLabelBox.Width(), axisStyle)
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linesBox := Text.MeasureLines(r, lines, axisStyle)
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xaxisHeight = Math.MaxInt(linesBox.Height()+(2*DefaultXAxisMargin), xaxisHeight)
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}
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}
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return 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: sbc.GetHeight() - xaxisHeight,
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}
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}
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return 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(10)
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dpb := sbc.Background.Padding.GetBottom(50)
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return Box{
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Top: 20,
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Left: 20,
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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) styleDefaultsTitle() Style {
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return sbc.TitleStyle.InheritFrom(Style{
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FontColor: DefaultTextColor,
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Font: sbc.GetFont(),
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FontSize: sbc.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 (sbc StackedBarChart) getTitleFontSize() float64 {
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effectiveDimension := Math.MinInt(sbc.GetWidth(), sbc.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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func (sbc StackedBarChart) styleDefaultsAxes() Style {
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return Style{
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StrokeColor: DefaultAxisColor,
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Font: sbc.GetFont(),
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FontSize: DefaultAxisFontSize,
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FontColor: DefaultAxisColor,
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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 (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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