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fixing styling issues w/ the stack bar chart.

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This commit is contained in:
Will Charczuk 2017-06-11 11:38:10 -07:00
parent 34de44488d
commit a0ea012903
2 changed files with 52 additions and 5 deletions
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7
_examples/stacked_bar/main.go
View File

@ -10,6 +10,13 @@ import (
func drawChart(res http.ResponseWriter, req *http.Request) {
sbc := chart.StackedBarChart{
Title: "Test Stacked Bar Chart",
TitleStyle: chart.StyleShow(),
Background: chart.Style{
Padding: chart.Box{
Top: 40,
},
},
Height: 512,
XAxis: chart.Style{
Show: true,

50
stacked_bar_chart.go
View File

@ -31,6 +31,8 @@ type StackedBarChart struct {
Title string
TitleStyle Style
ColorPalette ColorPalette
Width int
Height int
DPI float64
@ -114,6 +116,7 @@ func (sbc StackedBarChart) Render(rp RendererProvider, w io.Writer) error {
r.SetDPI(sbc.GetDPI(DefaultDPI))
canvasBox := sbc.getAdjustedCanvasBox(r, sbc.getDefaultCanvasBox())
sbc.drawCanvas(r, canvasBox)
sbc.drawBars(r, canvasBox)
sbc.drawXAxis(r, canvasBox)
sbc.drawYAxis(r, canvasBox)
@ -126,6 +129,10 @@ func (sbc StackedBarChart) Render(rp RendererProvider, w io.Writer) error {
return r.Save(w)
}
func (sbc StackedBarChart) drawCanvas(r Renderer, canvasBox Box) {
Draw.Box(r, canvasBox, sbc.getCanvasStyle())
}
func (sbc StackedBarChart) drawBars(r Renderer, canvasBox Box) {
xoffset := canvasBox.Left
for _, bar := range sbc.Bars {
@ -222,10 +229,43 @@ func (sbc StackedBarChart) drawYAxis(r Renderer, canvasBox Box) {
func (sbc StackedBarChart) drawTitle(r Renderer) {
if len(sbc.Title) > 0 && sbc.TitleStyle.Show {
Draw.TextWithin(r, sbc.Title, sbc.Box(), sbc.styleDefaultsTitle())
r.SetFont(sbc.TitleStyle.GetFont(sbc.GetFont()))
r.SetFontColor(sbc.TitleStyle.GetFontColor(sbc.GetColorPalette().TextColor()))
titleFontSize := sbc.TitleStyle.GetFontSize(DefaultTitleFontSize)
r.SetFontSize(titleFontSize)
textBox := r.MeasureText(sbc.Title)
textWidth := textBox.Width()
textHeight := textBox.Height()
titleX := (sbc.GetWidth() >> 1) - (textWidth >> 1)
titleY := sbc.TitleStyle.Padding.GetTop(DefaultTitleTop) + textHeight
r.Text(sbc.Title, titleX, titleY)
}
}
func (sbc StackedBarChart) getCanvasStyle() Style {
return sbc.Canvas.InheritFrom(sbc.styleDefaultsCanvas())
}
func (sbc StackedBarChart) styleDefaultsCanvas() Style {
return Style{
FillColor: sbc.GetColorPalette().CanvasColor(),
StrokeColor: sbc.GetColorPalette().CanvasStrokeColor(),
StrokeWidth: DefaultCanvasStrokeWidth,
}
}
// GetColorPalette returns the color palette for the chart.
func (sbc StackedBarChart) GetColorPalette() ColorPalette {
if sbc.ColorPalette != nil {
return sbc.ColorPalette
}
return AlternateColorPalette
}
func (sbc StackedBarChart) getDefaultCanvasBox() Box {
return sbc.Box()
}
@ -279,8 +319,8 @@ func (sbc StackedBarChart) Box() Box {
dpb := sbc.Background.Padding.GetBottom(50)
return Box{
Top: 20,
Left: 20,
Top: sbc.Background.Padding.GetTop(20),
Left: sbc.Background.Padding.GetLeft(20),
Right: sbc.GetWidth() - dpr,
Bottom: sbc.GetHeight() - dpb,
}
@ -288,9 +328,9 @@ func (sbc StackedBarChart) Box() Box {
func (sbc StackedBarChart) styleDefaultsStackedBarValue(index int) Style {
return Style{
StrokeColor: GetAlternateColor(index),
StrokeColor: sbc.GetColorPalette().GetSeriesColor(index),
StrokeWidth: 3.0,
FillColor: GetAlternateColor(index),
FillColor: sbc.GetColorPalette().GetSeriesColor(index),
}
}