test: add test for chart

examples/demo/main.go

@@ -460,7 +460,9 @@ func indexHandler(w http.ResponseWriter, req *http.Request) {
 				484,
 				300,
 			}, charts.PieSeriesOption{
-				LabelShow: true,
+				Label: charts.SeriesLabel{
+					Show: true,
+				},
 				Radius: "35%",
 			}),
 		},
@@ -551,7 +553,9 @@ func indexHandler(w http.ResponseWriter, req *http.Request) {
 						285.9,
 						204.5,
 					}, charts.PieSeriesOption{
-						LabelShow: true,
+						Label: charts.SeriesLabel{
+							Show: true,
+						},
 						Radius: "35%",
 					}),
 				},

pie_chart.go

@@ -47,6 +47,22 @@ type pieChartOption struct {
 	SeriesList SeriesList
 }
 
+func getPieRadius(diameter float64, radiusValue string) float64 {
+	var radius float64
+	if len(radiusValue) != 0 {
+		v := convertPercent(radiusValue)
+		if v != -1 {
+			radius = float64(diameter) * v
+		} else {
+			radius, _ = strconv.ParseFloat(radiusValue, 64)
+		}
+	}
+	if radius <= 0 {
+		radius = float64(diameter) * defaultRadiusPercent
+	}
+	return radius
+}
+
 func pieChartRender(opt pieChartOption, result *basicRenderResult) error {
 	d, err := NewDraw(DrawOption{
 		Parent: result.d,
@@ -79,19 +95,8 @@ func pieChartRender(opt pieChartOption, result *basicRenderResult) error {
 	cy := box.Height() >> 1
 
 	diameter := chart.MinInt(box.Width(), box.Height())
+	radius := getPieRadius(float64(diameter), radiusValue)
 
-	var radius float64
-	if len(radiusValue) != 0 {
-		v := convertPercent(radiusValue)
-		if v != -1 {
-			radius = float64(diameter) * v
-		} else {
-			radius, _ = strconv.ParseFloat(radiusValue, 64)
-		}
-	}
-	if radius <= 0 {
-		radius = float64(diameter) * defaultRadiusPercent
-	}
 	labelLineWidth := 15
 	if radius < 50 {
 		labelLineWidth = 10

pie_chart_test.go

@@ -30,6 +30,14 @@ import (
 	"github.com/wcharczuk/go-chart/v2/drawing"
 )
 
+func TestGetPieRadius(t *testing.T) {
+	assert := assert.New(t)
+
+	assert.Equal(50.0, getPieRadius(100, "50%"))
+	assert.Equal(30.0, getPieRadius(100, "30"))
+	assert.Equal(40.0, getPieRadius(100, ""))
+}
+
 func TestPieChartRender(t *testing.T) {
 	assert := assert.New(t)