[TOC] ## gif 動畫 修改原本的直接輸出到控制臺,我改為輸出值文件 <details> <summary>詳情</summary> ``` package main import ( "fmt" "image" "image/color" "image/gif" "io" "math" "math/rand" "os" ) var palette = []color.Color{color.White, color.Black} const ( whiteIndex = 0 // first color in palette blackIndex = 1 // next color in palette ) func main() { file, e := os.Create("a.gif") if e != nil { fmt.Printf("%+v",e) } lissajous(file) } func lissajous(out io.Writer) { const ( cycles = 5 // number of complete x oscillator revolutions res = 0.001 // angular resolution size = 100 nframes = 64 delay = 8 // image canvas covers [-size..+size] // number of animation frames // delay between frames in 10ms units ) freq := rand.Float64() * 3.0 // relative frequency of y oscillator anim := gif.GIF{LoopCount: nframes} phase := 0.0 // phase difference 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) // NOTE: ignoring encoding errors } ``` </details> <br />