我想循環(huán)重復(fù)旋轉(zhuǎn)圖像，以便使用 Go 的各種圖像處理工具創(chuàng)建 GIF，但我似乎無(wú)法弄清楚我做錯(cuò)了什么。此處，Gwenview 報(bào)告生成的 GIF 不是動(dòng)畫(huà)，并且僅包含一幀。package mainimport ( "image" "image/color/palette" "image/color" "image/gif" "image/draw" "io" "os" "github.com/disintegration/imaging")func main() { rotate(os.Stdout)}func rotate(out io.Writer) { f, _ := os.Open("myimage.png") defer f.Close() base, _, _ := image.Decode(f) const ( rot = 45 // degrees nframes = 5 // number of animation frames delay = 20 // delay between frames in 10ms units ) bounds := base.Bounds() anim := gif.GIF{LoopCount: nframes} for i := 0; i < nframes; i++ { img := imaging.Rotate(base, float64(360 - (rot * i)), color.Transparent) bounds = img.Bounds() palettedImg := image.NewPaletted(bounds, palette.Plan9) draw.Draw(palettedImg, bounds, img, bounds.Min, draw.Src) anim.Delay = append(anim.Delay, delay) anim.Image = append(anim.Image, palettedImg) } gif.EncodeAll(out, &anim) // NOTE: ignoring encoding errors}
2 回答
蕪湖不蕪
TA貢獻(xiàn)1796條經(jīng)驗(yàn) 獲得超7個(gè)贊
問(wèn)題確實(shí)是您忽略了錯(cuò)誤消息。永遠(yuǎn)不要那樣做，始終準(zhǔn)確地處理錯(cuò)誤！在您的特定情況下，您的示例不起作用，因?yàn)槟鷮⑿聞?chuàng)建的圖像邊界設(shè)置為原始圖像，但是因?yàn)樵诿總€(gè)幀迭代中您都在旋轉(zhuǎn)圖像，所以它們的尺寸超出了原始邊界。如果您沒(méi)有忽略編碼錯(cuò)誤，您可以捕捉到問(wèn)題所在。
err := gif.EncodeAll(out, &anim)
if err != nil {
fmt.Printf("%v", err)
}
錯(cuò)誤：
$ gif: image block is out of bounds
慕斯709654
TA貢獻(xiàn)1840條經(jīng)驗(yàn) 獲得超5個(gè)贊
這是我用來(lái)制作一個(gè)gif. 也許它可以幫助您找到解決方案。
package main
import (
"fmt"
"image"
"image/color"
"image/gif"
"math"
"os"
)
type Circle struct {
X, Y, R float64
}
func (c *Circle) Brightness(x, y float64) uint8 {
var dx, dy float64 = c.X - x, c.Y - y
d := math.Sqrt(dx*dx+dy*dy) / c.R
if d > 1 {
return 0
} else {
return 255
}
}
func main() {
var w, h int = 240, 240
var palette = []color.Color{
color.RGBA{0x00, 0x00, 0x00, 0xff}, color.RGBA{0x00, 0x00, 0xff, 0xff},
color.RGBA{0x00, 0xff, 0x00, 0xff}, color.RGBA{0x00, 0xff, 0xff, 0xff},
color.RGBA{0xff, 0x00, 0x00, 0xff}, color.RGBA{0xff, 0x00, 0xff, 0xff},
color.RGBA{0xff, 0xff, 0x00, 0xff}, color.RGBA{0xff, 0xff, 0xff, 0xff},
}
var images []*image.Paletted
var delays []int
var hw, hh float64 = float64(w / 2), float64(h / 2)
circles := []*Circle{&Circle{}, &Circle{}, &Circle{}}
steps := 20
// Set up for the animtion loop
for step := 0; step < steps; step++ {
img := image.NewPaletted(image.Rect(0, 0, w, h), palette)
images = append(images, img)
delays = append(delays, 0)
θ := 2.0 * math.Pi / float64(steps) * float64(step)
for i, circle := range circles {
θ0 := 2 * math.Pi / 3 * float64(i)
circle.X = hw - 40*math.Sin(θ0) - 20*math.Sin(θ0+θ)
circle.Y = hh - 40*math.Cos(θ0) - 20*math.Cos(θ0+θ)
circle.R = 50
}
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
img.Set(x, y, color.RGBA{
circles[0].Brightness(float64(x), float64(y)),
circles[1].Brightness(float64(x), float64(y)),
circles[2].Brightness(float64(x), float64(y)),
255,
})
}
}
}
f, err := os.OpenFile("rgb.gif", os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
fmt.Println(err)
return
}
defer f.Close()
gif.EncodeAll(f, &gif.GIF{
Image: images,
Delay: delays,
})
}
感謝nitoyon
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