feat: support padding option for chart

charts.go

@@ -51,6 +51,7 @@ type (
 		Padding chart.Box
 	}
 	Options struct {
+		Padding      chart.Box
 		Width        int
 		Height       int
 		Theme        string
@@ -112,6 +113,9 @@ func New(opt Options) (Graph, error) {
 	if height <= 0 {
 		height = DefaultChartHeight
 	}
+	bg := chart.Style{
+		Padding: opt.Padding,
+	}
 	if opt.Series[0].Type == SeriesPie {
 		values := make(chart.Values, len(opt.Series))
 		for index, item := range opt.Series {
@@ -121,13 +125,16 @@ func New(opt Options) (Graph, error) {
 			}
 		}
 		g := &chart.PieChart{
+			Background: bg,
 			Title:      opt.Title.Text,
 			TitleStyle: opt.Title.Style,
 			Width:      width,
 			Height:     height,
 			Values:     values,
-			ColorPalette: &ThemeColorPalette{
+			ColorPalette: &PieThemeColorPalette{
-				Theme: opt.Theme,
+				ThemeColorPalette: ThemeColorPalette{
+					Theme: opt.Theme,
+				},
 			},
 		}
 		return g, nil
@@ -158,7 +165,8 @@ func New(opt Options) (Graph, error) {
 	}
 
 	g := &chart.Chart{
-		Log: opt.Log,
+		Log:        opt.Log,
+		Background: bg,
 		ColorPalette: &ThemeColorPalette{
 			Theme: opt.Theme,
 		},

echarts.go

@@ -160,8 +160,9 @@ func (ex *EChartsXAxis) UnmarshalJSON(data []byte) error {
 }
 
 type ECharsOptions struct {
-	Theme string `json:"theme"`
+	Theme   string         `json:"theme"`
-	Title struct {
+	Padding EChartsPadding `json:"padding"`
+	Title   struct {
 		Text string `json:"text"`
 		// 暂不支持(go-chart默认title只能居中)
 		TextAlign string `json:"textAlign"`
@@ -238,8 +239,10 @@ func convertEChartsSeries(e *ECharsOptions) ([]Series, chart.TickPosition) {
 
 func (e *ECharsOptions) ToOptions() Options {
 	o := Options{
-		Theme: e.Theme,
+		Theme:   e.Theme,
+		Padding: e.Padding.box,
 	}
+
 	titleTextStyle := e.Title.TextStyle
 	o.Title = Title{
 		Text: e.Title.Text,

theme.go

@@ -133,6 +133,14 @@ type ThemeColorPalette struct {
 	Theme string
 }
 
+type PieThemeColorPalette struct {
+	ThemeColorPalette
+}
+
+func (tp PieThemeColorPalette) TextColor() drawing.Color {
+	return getTextColor("")
+}
+
 func (tp ThemeColorPalette) BackgroundColor() drawing.Color {
 	return getBackgroundColor(tp.Theme)
 }