77 lines
1.5 KiB
Go
77 lines
1.5 KiB
Go
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package main
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import (
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"math"
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"time"
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"github.com/faiface/pixel"
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"github.com/faiface/pixel/imdraw"
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"github.com/faiface/pixel/pixelgl"
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"golang.org/x/image/colornames"
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)
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func run() {
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cfg := pixelgl.WindowConfig{
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Title: "Xor",
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Bounds: pixel.R(0, 0, 1024, 768),
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Resizable: true,
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VSync: true,
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}
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win, err := pixelgl.NewWindow(cfg)
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if err != nil {
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panic(err)
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}
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imd := imdraw.New(nil)
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canvas := pixelgl.NewCanvas(win.Bounds())
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start := time.Now()
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for !win.Closed() {
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// in case window got resized, we also need to resize out canvas
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canvas.SetBounds(win.Bounds())
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offset := math.Sin(time.Since(start).Seconds()) * 300
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// clear the canvas to be totally transparent and set the xor compose method
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canvas.Clear(pixel.Alpha(0))
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canvas.SetComposeMethod(pixel.ComposeXor)
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// red circle
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imd.Clear()
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imd.Color(pixel.RGB(1, 0, 0))
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imd.Push(pixel.X(-offset) + win.Bounds().Center())
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imd.Circle(200, 0)
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imd.Draw(canvas)
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// blue circle
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imd.Clear()
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imd.Color(pixel.RGB(0, 0, 1))
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imd.Push(pixel.X(offset) + win.Bounds().Center())
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imd.Circle(150, 0)
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imd.Draw(canvas)
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// yellow circle
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imd.Clear()
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imd.Color(pixel.RGB(1, 1, 0))
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imd.Push(pixel.Y(-offset) + win.Bounds().Center())
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imd.Circle(100, 0)
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imd.Draw(canvas)
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// magenta circle
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imd.Clear()
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imd.Color(pixel.RGB(1, 0, 1))
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imd.Push(pixel.Y(offset) + win.Bounds().Center())
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imd.Circle(50, 0)
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imd.Draw(canvas)
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win.Clear(colornames.Green)
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canvas.Draw(win)
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win.Update()
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}
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}
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func main() {
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pixelgl.Run(run)
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}
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