feat: support label for line chart, #23

bar_chart.go

@@ -62,13 +62,6 @@ type BarChartOption struct {
 	Legend LegendOption
 }
 
-type barChartLabelRenderOption struct {
-	Text  string
-	Style Style
-	X     int
-	Y     int
-}
-
 func (b *barChart) render(result *defaultRenderResult, seriesList SeriesList) (Box, error) {
 	p := b.p
 	opt := b.opt
@@ -100,11 +93,12 @@ func (b *barChart) render(result *defaultRenderResult, seriesList SeriesList) (B
 
 	markPointPainter := NewMarkPointPainter(seriesPainter)
 	markLinePainter := NewMarkLinePainter(seriesPainter)
+	labelPainter := NewSeriesLabelPainter(seriesPainter)
 	rendererList := []Renderer{
+		labelPainter,
 		markPointPainter,
 		markLinePainter,
 	}
-	labelRenderOptions := make([]barChartLabelRenderOption, 0)
 	for index := range seriesList {
 		series := seriesList[index]
 		yRange := result.axisRanges[series.AxisIndex]
@@ -168,8 +162,7 @@ func (b *barChart) render(result *defaultRenderResult, seriesList SeriesList) (B
 			}
 
 			textBox := seriesPainter.MeasureText(text)
-
-			labelRenderOptions = append(labelRenderOptions, barChartLabelRenderOption{
+			labelPainter.Add(LabelValue{
 				Text:  text,
 				Style: labelStyle,
 				X:     x + (barWidth-textBox.Width())>>1,
@@ -192,10 +185,6 @@ func (b *barChart) render(result *defaultRenderResult, seriesList SeriesList) (B
 			Range:       yRange,
 		})
 	}
-	for _, labelOpt := range labelRenderOptions {
-		seriesPainter.OverrideTextStyle(labelOpt.Style)
-		seriesPainter.Text(labelOpt.Text, labelOpt.X, labelOpt.Y)
-	}
 	// 最大、最小的mark point
 	err := doRender(rendererList...)
 	if err != nil {