Go GIF 动画

代码:

package mainimport (    "image"    "image/gif"    "image/color"    "os"    "math"    "io")var palette = []color.Color{color.Black,color.RGBA{0,255,0,255}}const (    blackIndex = 0    greenIndex = 1)func main() {    drawSin(os.Stdout)}func drawSin(out io.Writer) {    const (        nframes = 80   //帧数        resolution = 0.0001  //分辨率        size = 300   //画布大小        delay = 10  //延迟    )    anim := gif.GIF{LoopCount: nframes}    x := 0.0    for i := 0; i < nframes; i++ {        rect := image.Rect(0,0,size,size)        img := image.NewPaletted(rect,palette)        for t := 0.0; t < size; t += resolution {            y := size / 2 *math.Sin(t + x);            img.SetColorIndex(int(t + 0.5),int(size / 2 + y),greenIndex)        }    x  += 3 * resolution    anim.Delay = append(anim.Delay,delay)    anim.Image = append(anim.Image,img)    }    gif.EncodeAll(out,&anim)}

效果: