feat: support pie, radar and funnel chart

examples/radar_chart/main.go

@@ -0,0 +1,112 @@
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/vicanso/go-charts"
+)
+
+func writeFile(buf []byte) error {
+	tmpPath := "./tmp"
+	err := os.MkdirAll(tmpPath, 0700)
+	if err != nil {
+		return err
+	}
+
+	file := filepath.Join(tmpPath, "radar-chart.png")
+	err = ioutil.WriteFile(file, buf, 0600)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	p, err := charts.NewPainter(charts.PainterOptions{
+		Width:  800,
+		Height: 600,
+		Type:   charts.ChartOutputPNG,
+	})
+	if err != nil {
+		panic(err)
+	}
+	_, err = charts.NewRadarChart(p, charts.RadarChartOption{
+		Padding: charts.Box{
+			Left:   10,
+			Top:    10,
+			Right:  10,
+			Bottom: 10,
+		},
+		Title: charts.TitleOption{
+			Text: "Basic Radar Chart",
+		},
+		Legend: charts.NewLegendOption([]string{
+			"Allocated Budget",
+			"Actual Spending",
+		}),
+		RadarIndicators: []charts.RadarIndicator{
+			{
+				Name: "Sales",
+				Max:  6500,
+			},
+			{
+				Name: "Administration",
+				Max:  16000,
+			},
+			{
+				Name: "Information Technology",
+				Max:  30000,
+			},
+			{
+				Name: "Customer Support",
+				Max:  38000,
+			},
+			{
+				Name: "Development",
+				Max:  52000,
+			},
+			{
+				Name: "Marketing",
+				Max:  25000,
+			},
+		},
+		SeriesList: charts.SeriesList{
+			{
+				Type: charts.ChartTypeRadar,
+				Data: charts.NewSeriesDataFromValues([]float64{
+					4200,
+					3000,
+					20000,
+					35000,
+					50000,
+					18000,
+				}),
+			},
+			{
+				Type: charts.ChartTypeRadar,
+				Data: charts.NewSeriesDataFromValues([]float64{
+					5000,
+					14000,
+					28000,
+					26000,
+					42000,
+					21000,
+				}),
+			},
+		},
+	}).Render()
+	if err != nil {
+		panic(err)
+	}
+
+	buf, err := p.Bytes()
+	if err != nil {
+		panic(err)
+	}
+	err = writeFile(buf)
+	if err != nil {
+		panic(err)
+	}
+}