54 lines
1.0 KiB
Go
54 lines
1.0 KiB
Go
package main
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import (
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"fmt"
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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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"os"
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)
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const (
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up = iota
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rt
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dn
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lt
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)
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func main() {
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bounds := image.Rect(0, 0, 100, 100)
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im := image.NewGray(bounds)
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gBlack := color.Gray{0}
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gWhite := color.Gray{255}
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draw.Draw(im, bounds, image.NewUniform(gWhite), image.ZP, draw.Src)
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pos := image.Point{50, 50}
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dir := up
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for pos.In(bounds) {
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switch im.At(pos.X, pos.Y).(color.Gray).Y {
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case gBlack.Y:
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im.SetGray(pos.X, pos.Y, gWhite)
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dir--
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case gWhite.Y:
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im.SetGray(pos.X, pos.Y, gBlack)
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dir++
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}
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if dir&1 == 1 {
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pos.X += 1 - dir&2
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} else {
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pos.Y -= 1 - dir&2
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}
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}
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f, err := os.Create("ant.png")
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if err != nil {
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fmt.Println(err)
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return
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}
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if err = png.Encode(f, im); err != nil {
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fmt.Println(err)
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}
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if err = f.Close(); err != nil {
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fmt.Println(err)
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}
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}
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