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155 lines
5.3 KiB
HTML
155 lines
5.3 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<script src="../scripts/force-https.js"></script>
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<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/masking.png">
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<meta name="description" content="Ebiten example - masking">
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
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<link rel="icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - masking</title>
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<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
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<link rel="stylesheet" href="../stylesheets/highlight-github.css">
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<link rel="stylesheet" href="../stylesheets/ebiten.css">
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<script src="../scripts/googleanalytics.js"></script>
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<nav class="navbar"><div class="container">
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<nav class="d-flex flex-row" style="width: 100%;">
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<div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div>
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<ul class="nav">
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<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
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<li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
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<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>
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</ul>
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</nav>
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</div></nav>
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<main><div class="container">
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<h2>Ebiten example - masking</h2>
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<iframe src="masking.content.html" width="640" height="480"></iframe>
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<div class="card"><pre class="card-body"><code class="language-go">// +build example
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package main
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import (
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"image"
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"image/color"
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_ "image/jpeg"
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"log"
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"math"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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gophersImage *ebiten.Image
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fiveyearsImage *ebiten.Image
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maskImage *ebiten.Image
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spotLightImage *ebiten.Image
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spotLightX = 0
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spotLightY = 0
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spotLightVX = 1
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spotLightVY = 1
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)
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func update(screen *ebiten.Image) error {
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spotLightX += spotLightVX
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spotLightY += spotLightVY
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if spotLightX < 0 {
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spotLightX = -spotLightX
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spotLightVX = -spotLightVX
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}
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if spotLightY < 0 {
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spotLightY = -spotLightY
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spotLightVY = -spotLightVY
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}
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w, h := spotLightImage.Size()
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maxX, maxY := screenWidth-w, screenHeight-h
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if maxX < spotLightX {
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spotLightX = -spotLightX + 2*maxX
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spotLightVX = -spotLightVX
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}
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if maxY < spotLightY {
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spotLightY = -spotLightY + 2*maxY
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spotLightVY = -spotLightVY
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}
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if ebiten.IsRunningSlowly() {
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return nil
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}
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maskImage.Clear()
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(spotLightX), float64(spotLightY))
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maskImage.DrawImage(spotLightImage, op)
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op = &ebiten.DrawImageOptions{}
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op.CompositeMode = ebiten.CompositeModeSourceOut
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maskImage.DrawImage(fiveyearsImage, op)
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screen.Fill(color.RGBA{0x00, 0x00, 0x80, 0xff})
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screen.DrawImage(gophersImage, &ebiten.DrawImageOptions{})
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screen.DrawImage(maskImage, &ebiten.DrawImageOptions{})
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return nil
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}
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func max(a, b int) int {
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if a < b {
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return b
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}
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return a
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}
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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func main() {
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var err error
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gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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fiveyearsImage, _, err = ebitenutil.NewImageFromFile("_resources/images/fiveyears.jpg", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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maskImage, _ = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
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as := image.Point{128, 128}
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a := image.NewAlpha(image.Rectangle{image.ZP, as})
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for j := 0; j < as.Y; j++ {
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for i := 0; i < as.X; i++ {
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r := as.X / 2
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d := math.Sqrt(float64((i-r)*(i-r) + (j-r)*(j-r)))
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b := uint8(max(0, min(0xff, 3*0xff-int(d*3*0xff)/r)))
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a.SetAlpha(i, j, color.Alpha{b})
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}
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}
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spotLightImage, _ = ebiten.NewImageFromImage(a, ebiten.FilterNearest)
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Masking (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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</code></pre></div>
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</div></main>
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<footer><div class="container">
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<p>© 2013 Hajime Hoshi</p>
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<p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p>
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<p>The content of this page is licensed under <a href="https://creativecommons.org/licenses/by/4.0/">the Creative Commons Attribution 4.0 License</a>.</p>
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</div></footer>
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<script src="../scripts/highlight.pack.js"></script>
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<script>hljs.initHighlightingOnLoad();</script>
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