main.go

package main

import (
	"os"
	"path/filepath"

	"github.com/go-analyze/charts"
)

/*
Example radar chart with a variety of basic configuration options shown using the Painter API.
*/

func writeFile(buf []byte) error {
	tmpPath := "./tmp"
	if err := os.MkdirAll(tmpPath, 0700); err != nil {
		return err
	}

	file := filepath.Join(tmpPath, "radar-chart-2.png")
	return os.WriteFile(file, buf, 0600)
}

func main() {
	values := [][]float64{
		{4200, 3000, 20000, 35000, 50000, 18000},
		{5000, 14000, 28000, 26000, 42000, 21000},
	}

	opt := charts.NewRadarChartOptionWithData(values,
		[]string{
			"Sales",
			"Administration",
			"Information Technology",
			"Customer Support",
			"Development",
			"Marketing",
		},
		[]float64{
			6500,
			16000,
			30000,
			38000,
			52000,
			25000,
		})
	opt.Title = charts.TitleOption{
		Text:      "Basic Radar Chart",
		FontStyle: charts.NewFontStyleWithSize(16),
	}
	opt.Legend = charts.LegendOption{
		Data: []string{
			"Allocated Budget", "Actual Spending",
		},
		Offset: charts.OffsetRight,
	}

	p := charts.NewPainter(charts.PainterOptions{
		OutputFormat: charts.ChartOutputPNG,
		Width:        600,
		Height:       400,
	})
	if err := p.RadarChart(opt); err != nil {
		panic(err)
	} else if buf, err := p.Bytes(); err != nil {
		panic(err)
	} else if err = writeFile(buf); err != nil {
		panic(err)
	}
}