openfill.go

package main

import (
	"math"
	"math/rand"

	"github.com/fogleman/gg"
)

func main() {
	dc := gg.NewContext(1000, 1000)
	for j := 0; j < 10; j++ {
		for i := 0; i < 10; i++ {
			x := float64(i)*100 + 50
			y := float64(j)*100 + 50
			a1 := rand.Float64() * 2 * math.Pi
			a2 := a1 + rand.Float64()*math.Pi + math.Pi/2
			dc.DrawArc(x, y, 40, a1, a2)
			// dc.ClosePath()
		}
	}
	dc.SetRGB(0, 0, 0)
	dc.FillPreserve()
	dc.SetRGB(1, 1, 1)
	dc.SetLineWidth(8)
	dc.StrokePreserve()
	dc.SetRGB(1, 0, 0)
	dc.SetLineWidth(4)
	dc.StrokePreserve()
	dc.SavePNG("out.png")
}