init commit

.gitignore

@@ -0,0 +1 @@
+furueru

Readme.md

@@ -0,0 +1,17 @@
+# furueru.go
+
+## description
+
+create shake gif from png file
+
+## build
+
+```
+go build
+```
+
+## usage
+
+```
+$ ./furueru sample.png # > outfile sample.png.gif
+```

main.go

@@ -0,0 +1,68 @@
+package main
+
+import (
+	"os"
+	"image"
+	"image/gif"
+	"image/png"
+	"image/color/palette"
+	"math/rand"
+ )
+
+func writeGifFile(outFileNmae string, g gif.GIF) {
+	outFile, _ := os.Create(outFileNmae)
+	defer outFile.Close()
+
+
+	g.Delay = make([]int, len(g.Image))
+	g.LoopCount = 0
+
+	gif.EncodeAll(outFile, &g)
+}
+
+func slideImage (in image.Image, slideX int, slideY int) *image.Paletted {
+	margin := 2
+	inBounds := in.Bounds()
+	rect :=  image.Rect(inBounds.Min.X, inBounds.Min.Y, inBounds.Max.X + margin, inBounds.Max.Y + margin)
+	pl := image.NewPaletted(rect, palette.WebSafe)
+
+	for x := 0; x < inBounds.Max.X; x++ {
+		for y := 0; y < inBounds.Max.Y; y++ {
+			pl.Set(x + slideX, y + slideY, in.At(x, y))
+		}
+	}
+	return pl
+}
+
+func calsSlideVolume() (int, int) {
+	x := (rand.Int() % 3)
+	y := (rand.Int() % 3)
+	return x, y
+}
+
+func generateAnimeGif(inFileNmae string) {
+	inFile,  _ := os.Open(inFileNmae)
+	defer inFile.Close()
+
+	pngImage, _ := png.Decode(inFile)
+	moveTimes := 100
+
+	outGif := gif.GIF {
+		Image: []*image.Paletted {},
+	}
+
+	for s := 0; s < moveTimes; s++ {
+		palet := slideImage(pngImage, 1, 1)
+		outGif.Image = append(outGif.Image, palet)
+
+		slideX, slideY := calsSlideVolume()
+		palet = slideImage(pngImage, slideX, slideY)
+		outGif.Image = append(outGif.Image, palet)
+	}
+
+	writeGifFile(inFileNmae + ".gif", outGif)
+}
+
+func main () {
+	generateAnimeGif(os.Args[1])
+}