如何调试gif错误

Question

我跟随guide by Alan Donovan并尝试制作gif。但是在输出中我总是得到不可读的gif图像。我记得，当我在Windows 8.0上时，我可以轻松地重新制作这个例子，但今天在Ubuntu16.04上我不知道我的错误在哪里以及如何解决它。我的代码：

package main

import (
    "image/color"
    "os"
    "io"
    "math/rand"
    "time"
    "image/gif"
    "image"
    "math"
)

var palette = []color.Color{color.White, color.Black}

const (
    whiteIndex = 0
    blackIndex = 1
)

func main() {
    lissajous(os.Stdout)
}

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 += 0.2
        anim.Delay = append(anim.Delay, delay)
        anim.Image = append(anim.Image, img)
    }
    gif.EncodeAll(out, &anim)
}

刚从书中复制过来。源文件放在'〜/ go / src / learning /'中

Answer 1

使用像Firefox这样的gif阅读器打开gif文件。例如，

$ go run lissajous.go > lissajous.gif && firefox lissajous.gif