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- package main
- var palette = []color.Color{color.Black, color.RGBA{0, 255, 0, 255}}
- const (
- whiteIndex = iota
- blackIndex
- )
- func lissajous(out io.Writer) {
- const (
- cycles = 5
- res = 0.001
- size = 100
- nframes = 64
- delay = 8
- )
- rand.Seed(time.Now().UTC().UnixNano())
- freq := rand.Float64() * 3.0
- anim := gif.GIF{LoopCount: nframes}
- phase := 0.0
- for i := 0; i < nframes; i++ {
- rect := image.Rect(0, 0, 2*size+1, 2*size+1)
- img := image.NewPaletted(rect, palette)
- for t := 0.0; t < cycles*2*math.Pi; t += res {
- x := math.Sin(t)
- y := math.Sin(t*freq + phase)
- img.SetColorIndex(size+int(x*size+0.5), size+int(y*size+0.5),
- blackIndex)
- }
- phase += 0.1
- anim.Delay = append(anim.Delay, delay)
- anim.Image = append(anim.Image, img)
- }
- gif.EncodeAll(out, &anim)
- }
- func main_1() {
- lissajous(os.Stdout)
- }
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