fix: fix unit count of xasix

axis.go

@@ -156,8 +156,11 @@ func (a *axisPainter) Render() (Box, error) {
 
 	// 增加30px来计算文本展示区域
 	textFillWidth := float64(textMaxWidth + 20)
-	textCount := ceilFloatToInt(float64(top.Width()) / textFillWidth)
-	unit := ceilFloatToInt(float64(dataCount) / float64(chart.MaxInt(textCount, opt.SplitNumber)))
+	// 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++

chart_option.go

@@ -108,9 +108,12 @@ func TitleOptionFunc(title TitleOption) OptionFunc {
 }
 
 // TitleTextOptionFunc set title text of chart
-func TitleTextOptionFunc(text string) OptionFunc {
+func TitleTextOptionFunc(text string, subtext ...string) OptionFunc {
 	return func(opt *ChartOption) {
 		opt.Title.Text = text
+		if len(subtext) != 0 {
+			opt.Title.Subtext = subtext[0]
+		}
 	}
 }
 

legend.go

@@ -232,7 +232,7 @@ func (l *legendPainter) Render() (Box, error) {
 		x0 += measureList[index].Width()
 		if opt.Align == AlignRight {
 			x0 += textOffset
-			x0 = drawIcon(0, x0)
+			x0 = drawIcon(y0, x0)
 		}
 		if opt.Orient == OrientVertical {
 			y0 += offset