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added option for line chart bg fill opacity

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This commit is contained in:
Thomas Knierim 2022-12-26 15:06:53 +07:00
parent 830d4bdd21
commit a767b3e1af
3 changed files with 10 additions and 1 deletions
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8
line_chart.go
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@ -70,6 +70,8 @@ type LineChartOption struct {
FillArea bool
// background is filled
backgroundIsFilled bool
// background fill (alpha) opacity
Opacity uint8
}
func (l *lineChart) render(result *defaultRenderResult, seriesList SeriesList) (Box, error) {
@ -156,6 +158,10 @@ func (l *lineChart) render(result *defaultRenderResult, seriesList SeriesList) (
areaPoints := make([]Point, len(points))
copy(areaPoints, points)
bottomY := yRange.getRestHeight(yRange.min)
var opacity uint8 = 200
if opt.Opacity != 0 {
opacity = opt.Opacity
}
areaPoints = append(areaPoints, Point{
X: areaPoints[len(areaPoints)-1].X,
Y: bottomY,
@ -164,7 +170,7 @@ func (l *lineChart) render(result *defaultRenderResult, seriesList SeriesList) (
Y: bottomY,
}, areaPoints[0])
seriesPainter.SetDrawingStyle(Style{
FillColor: seriesColor.WithAlpha(200),
FillColor: seriesColor.WithAlpha(opacity),
})
seriesPainter.FillArea(areaPoints)
}