refactor: adjust text render of axis

axis.go

@@ -153,8 +153,14 @@ func (a *axisPainter) Render() (Box, error) {
 	top.SetDrawingStyle(style).OverrideTextStyle(style)
 
 	textMaxWidth, textMaxHeight := top.MeasureTextMaxWidthHeight(data)
-	textCount := ceilFloatToInt(float64(top.Width()) / float64(textMaxWidth))
+
+	textFillWidth := float64(textMaxWidth) * 1.3
+	textCount := ceilFloatToInt(float64(top.Width()) / textFillWidth)
 	unit := ceilFloatToInt(float64(dataCount) / float64(chart.MaxInt(textCount, opt.SplitNumber)))
+	// 偶数
+	if unit%2 == 0 && dataCount%(unit+1) == 0 {
+		unit++
+	}
 
 	width := 0
 	height := 0

painter.go

@@ -653,8 +653,9 @@ func (p *Painter) MultiText(opt MultiTextOption) *Painter {
 	} else {
 		values = autoDivide(width, count)
 	}
+	showIndex := opt.Unit / 2
 	for index, text := range opt.TextList {
-		if opt.Unit != 0 && index%opt.Unit != 0 {
+		if opt.Unit != 0 && index%opt.Unit != showIndex {
 			continue
 		}
 		box := p.MeasureText(text)