mandelbrot.go

package main

import (
	"image"
	"image/color"
	"image/png"
	"math/cmplx"
	"math/rand"
	"os"
)

func main() {
	const (
		xmin, ymin, xmax, ymax = -2, -2, +2, +2
		width, height          = 1024, 1024
	)

	var points [width][height]color.Color

	img := image.NewRGBA(image.Rect(0, 0, width, height))

	for py := range points {
		y := float64(py)/height*(ymax-ymin) + ymin
		for px := range points[py] {
			x := float64(px)/width*(xmax-xmin) + xmin
			z := complex(x, y)
			points[px][py] = mandelbrot(z)
			img.Set(px, py, points[px][py])
		}
	}

	for py := 0; py < 1024/4; py += 4 {
		for px := 0; px < 1024/4; px += 4 {

		}
	}

	png.Encode(os.Stdout, img)
}

func mandelbrot(z complex128) color.Color {
	const iterations = 200
	const constrast = 15

	var v complex128

	for n := uint8(0); n < iterations; n++ {
		v = v*v + z
		if cmplx.Abs(v) > 2 {
			return color.RGBA{255 - constrast*n, 255 - constrast*n, 255 - constrast*n, 255}
		}
	}

	return color.RGBA{uint8(rand.Intn(255)), uint8(rand.Intn(255)), uint8(rand.Intn(255)), uint8(rand.Intn(255))}
}