fix: fix series render of horizontal bar, #31

axis.go

@@ -75,6 +75,7 @@ type AxisOption struct {
 	SplitLineShow bool
 	// The color of split line
 	SplitLineColor Color
+	Unit           int
 }
 
 func (a *axisPainter) Render() (Box, error) {
@@ -159,11 +160,15 @@ func (a *axisPainter) Render() (Box, error) {
 	// 根据文本宽度计算较为符合的展示项
 	fitTextCount := ceilFloatToInt(float64(top.Width()) / textFillWidth)
 
-	unit := ceilFloatToInt(float64(dataCount) / float64(fitTextCount))
-	unit = chart.MaxInt(unit, opt.SplitNumber)
-	// 偶数
-	if unit%2 == 0 && dataCount%(unit+1) == 0 {
-		unit++
+	unit := opt.Unit
+	if unit <= 0 {
+
+		unit = ceilFloatToInt(float64(dataCount) / float64(fitTextCount))
+		unit = chart.MaxInt(unit, opt.SplitNumber)
+		// 偶数
+		if unit%2 == 0 && dataCount%(unit+1) == 0 {
+			unit++
+		}
 	}
 
 	width := 0

charts.go

@@ -186,6 +186,10 @@ func defaultRender(p *Painter, opt defaultRenderOption) (*defaultRenderResult, e
 		if len(opt.YAxisOptions) > index {
 			yAxisOption = opt.YAxisOptions[index]
 		}
+		divideCount := yAxisOption.DivideCount
+		if divideCount <= 0 {
+			divideCount = defaultAxisDivideCount
+		}
 		max, min := opt.SeriesList.GetMaxMin(index)
 		r := NewRange(AxisRangeOption{
 			Painter: p,
@@ -194,7 +198,7 @@ func defaultRender(p *Painter, opt defaultRenderOption) (*defaultRenderResult, e
 			// 高度需要减去x轴的高度
 			Size: rangeHeight,
 			// 分隔数量
-			DivideCount: defaultAxisDivideCount,
+			DivideCount: divideCount,
 		})
 		if yAxisOption.Min != nil && *yAxisOption.Min <= min {
 			r.min = *yAxisOption.Min
@@ -346,6 +350,10 @@ func Render(opt ChartOption, opts ...OptionFunc) (*Painter, error) {
 			},
 		}
 	}
+	if len(horizontalBarSeriesList) != 0 {
+		renderOpt.YAxisOptions[0].DivideCount = len(renderOpt.YAxisOptions[0].Data)
+		renderOpt.YAxisOptions[0].Unit = 1
+	}
 
 	renderResult, err := defaultRender(p, renderOpt)
 	if err != nil {

examples/horizontal_bar_chart/main.go

@@ -26,6 +26,7 @@ func writeFile(buf []byte) error {
 func main() {
 	values := [][]float64{
 		{
+			8203,
 			18203,
 			23489,
 			29034,
@@ -34,6 +35,7 @@ func main() {
 			630230,
 		},
 		{
+			9325,
 			19325,
 			23438,
 			31000,
@@ -56,6 +58,7 @@ func main() {
 			"2012",
 		}),
 		charts.YAxisDataOptionFunc([]string{
+			"UN",
 			"Brazil",
 			"Indonesia",
 			"USA",

yaxis.go

@@ -47,6 +47,8 @@ type YAxisOption struct {
 	Color Color
 	// The flag for show axis, set this to *false will hide axis
 	Show           *bool
+	DivideCount    int
+	Unit           int
 	isCategoryAxis bool
 }
 
@@ -87,6 +89,7 @@ func (opt *YAxisOption) ToAxisOption(p *Painter) AxisOption {
 		SplitLineShow:  true,
 		SplitLineColor: theme.GetAxisSplitLineColor(),
 		Show:           opt.Show,
+		Unit:           opt.Unit,
 	}
 	if !opt.Color.IsZero() {
 		axisOpt.FontColor = opt.Color