feat: support rounded rect for horizontal bar chart

examples/horizontal_bar_chart/main.go

@@ -65,6 +65,9 @@ func main() {
 			"China",
 			"World",
 		}),
+		func(opt *charts.ChartOption) {
+			opt.SeriesList[0].RoundRadius = 5
+		},
 	)
 	if err != nil {
 		panic(err)

horizontal_bar_chart.go

@@ -136,6 +136,7 @@ func (h *horizontalBarChart) render(result *defaultRenderResult, seriesList Seri
 				fillColor = item.Style.FillColor
 			}
 			right := w
+			if series.RoundRadius <= 0 {
 				seriesPainter.OverrideDrawingStyle(Style{
 					FillColor: fillColor,
 				}).Rect(chart.Box{
@@ -144,6 +145,17 @@ func (h *horizontalBarChart) render(result *defaultRenderResult, seriesList Seri
 					Right:  right,
 					Bottom: y + barHeight,
 				})
+			} else {
+				seriesPainter.OverrideDrawingStyle(Style{
+					FillColor: fillColor,
+				}).RoundedRect(chart.Box{
+					Top:    y,
+					Left:   0,
+					Right:  right,
+					Bottom: y + barHeight,
+				}, series.RoundRadius)
+			}
+
 			// 如果label不需要展示，则返回
 			if labelPainter == nil {
 				continue