refactor: default render function for axis

charts.go

@@ -27,16 +27,92 @@ type Renderer interface {
 }
 
 type defaultRenderOption struct {
-	Theme   ColorPalette
-	Padding Box
+	Theme      ColorPalette
+	Padding    Box
+	SeriesList SeriesList
+	// The y axis option
+	YAxisOptions []YAxisOption
+	// The x axis option
+	XAxis XAxisOption
 }
 
-func defaultRender(p *Painter, opt defaultRenderOption) *Painter {
+type defaultRenderResult struct {
+	axisRanges map[int]axisRange
+	p          *Painter
+}
+
+func defaultRender(p *Painter, opt defaultRenderOption) (*defaultRenderResult, error) {
 	p.SetBackground(p.Width(), p.Height(), opt.Theme.GetBackgroundColor())
 	if !opt.Padding.IsZero() {
 		p = p.Child(PainterPaddingOption(opt.Padding))
 	}
-	return p
+	result := defaultRenderResult{
+		axisRanges: make(map[int]axisRange),
+	}
+
+	// 计算图表对应的轴有哪些
+	axisIndexList := make([]int, 0)
+	for _, series := range opt.SeriesList {
+		if containsInt(axisIndexList, series.AxisIndex) {
+			continue
+		}
+		axisIndexList = append(axisIndexList, series.index)
+	}
+	// 高度需要减去x轴的高度
+	rangeHeight := p.Height() - defaultXAxisHeight
+	rangeWidth := 0
+
+	// 计算对应的axis range
+	for _, index := range axisIndexList {
+		max, min := opt.SeriesList.GetMaxMin(index)
+		r := NewRange(AxisRangeOption{
+			Min: min,
+			Max: max,
+			// 高度需要减去x轴的高度
+			Size: rangeHeight,
+			// 分隔数量
+			DivideCount: defaultAxisDivideCount,
+		})
+		result.axisRanges[index] = r
+		yAxisOption := YAxisOption{}
+		if len(opt.YAxisOptions) > index {
+			yAxisOption = opt.YAxisOptions[index]
+		}
+		if yAxisOption.Theme == nil {
+			yAxisOption.Theme = opt.Theme
+		}
+		yAxisOption.Data = r.Values()
+		reverseStringSlice(yAxisOption.Data)
+		// TODO生成其它位置既yAxis
+		yAxis := NewLeftYAxis(p, yAxisOption)
+		yAxisBox, err := yAxis.Render()
+		if err != nil {
+			return nil, err
+		}
+		rangeWidth += yAxisBox.Width()
+	}
+
+	if opt.XAxis.Theme == nil {
+		opt.XAxis.Theme = opt.Theme
+	}
+	xAxis := NewBottomXAxis(p.Child(PainterPaddingOption(Box{
+		Left: rangeWidth,
+	})), opt.XAxis)
+	_, err := xAxis.Render()
+	if err != nil {
+		return nil, err
+	}
+
+	// // 生成Y轴
+	// for _, yAxisOption := range opt.YAxisOptions {
+
+	// }
+
+	result.p = p.Child(PainterPaddingOption(Box{
+		Bottom: rangeHeight,
+		Left:   rangeWidth,
+	}))
+	return &result, nil
 }
 
 func doRender(renderers ...Renderer) error {