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53 lines
1.1 KiB
53 lines
1.1 KiB
package main
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import (
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"fmt"
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"flag"
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"image"
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"image/color"
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"image/draw"
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"image/png"
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"math/rand"
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"os"
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"time"
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)
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var (
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outfile = flag.String("o", "randimg.png", "Output PNG file name")
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)
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func main() {
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flag.Parse()
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rand.Seed(time.Now().UTC().UnixNano())
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out, err := os.Create(*outfile)
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if err != nil {
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fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
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os.Exit(1)
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}
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imgRect := image.Rect(0, 0, 200, 200)
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img := image.NewGray(imgRect)
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draw.Draw(img, img.Bounds(), &image.Uniform{color.White}, image.ZP, draw.Src)
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for y := 0; y < 200; y += 10 {
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for x := 0; x < 200; x += 10 {
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fill := &image.Uniform{color.Black}
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if rand.Intn(10) % 2 == 0 {
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fill = &image.Uniform{color.White}
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}
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draw.Draw(img, image.Rect(x, y, x+10, y+10), fill, image.ZP, draw.Src)
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}
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}
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err = png.Encode(out, img)
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if err != nil {
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fmt.Fprintf(os.Stderr, "ERROR: %v\n", err)
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os.Exit(2)
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}
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fmt.Printf("Wrote random image to \"%s\"\n", *outfile)
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os.Exit(0)
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}
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