81 lines
2.1 KiB
Go
81 lines
2.1 KiB
Go
package main
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import (
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"image"
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"image/color"
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"math/rand"
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iu "git.nkpl.cc/twocookedfaggots/imageutils"
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)
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func square(side int) image.Rectangle { return image.Rect(0, 0, side, side) }
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func Circles(b image.Rectangle, radius int) chan iu.Circle {
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ch := make(chan iu.Circle)
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go func() {
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defer close(ch)
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for {
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x, y := rand.Int()%b.Dx(), rand.Int()%b.Dy()
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dxdy := b.Dx() * b.Dy()
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r := rand.Int() % (dxdy / (dxdy / radius))
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ch <- iu.Circle{image.Point{x, y}, r}
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}
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}()
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return ch
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}
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var Opaque, Transparent = color.Alpha{0xff}, color.Alpha{0}
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type xor struct{ dst, src image.Image }
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func (t xor) ColorModel() color.Model { return t.dst.ColorModel() }
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func (t xor) Bounds() image.Rectangle { return t.src.Bounds() }
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func (t xor) At(x, y int) color.Color {
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dstColor := t.ColorModel().Convert(t.dst.At(x, y))
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srcColor := t.ColorModel().Convert(t.src.At(x, y))
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// xor operation (a || b) && !(a && b)
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if ((dstColor == color.Opaque) || (srcColor == color.Opaque)) &&
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!((dstColor == color.Opaque) && (srcColor == color.Opaque)) {
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return color.Opaque
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}
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return color.Transparent
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}
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var exchange = color.ModelFunc(
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func(c color.Color) color.Color {
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if color.Alpha16Model.Convert(c) == color.Transparent {
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return color.Opaque
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}
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return color.Transparent
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},
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)
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type Exchange struct{ image.Image }
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func (e Exchange) ColorModel() color.Model { return color.Alpha16Model }
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func (e Exchange) Bounds() image.Rectangle { return e.Image.Bounds() }
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func (e Exchange) At(x, y int) color.Color {
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c := e.ColorModel().Convert(e.Image.At(x, y))
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return exchange.Convert(c)
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}
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var blackAndWhite = color.ModelFunc(
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func(c color.Color) color.Color {
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if color.Alpha16Model.Convert(c) == color.Transparent {
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return color.Black
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}
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return color.White
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},
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)
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// Black and white's alpha image.
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type BlackAndWhite struct{ image.Image }
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func (b BlackAndWhite) ColorModel() color.Model { return color.Gray16Model }
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func (b BlackAndWhite) Bounds() image.Rectangle { return b.Image.Bounds() }
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func (b BlackAndWhite) At(x, y int) color.Color {
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c := b.Image.At(x, y)
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return blackAndWhite.Convert(c)
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}
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