Density plot example.

count.svg

main.go

package main

import (
	"io/ioutil"
	"math/rand"

	"github.com/loov/plot"
)

func main() {
	var counts []int64
	for i := 0; i < 1000000; i++ {
		counts = append(counts, int64(rand.NormFloat64()*100+1000))
	}

	p := plot.New()

	density := plot.NewDensity("Count", plot.Int64sToFloat64s(counts))
	// density.Kernel = 10 // sometimes you need to manually tweak this when the output isn't smooth enough

	p.AddGroup(
		plot.NewGrid(),
		plot.NewGizmo(),
		density,
		plot.NewTickLabels(),
	)

	svg := plot.NewSVG(800, 600)
	p.Draw(svg)
	ioutil.WriteFile("count.svg", svg.Bytes(), 0755)
}