mirror of
https://github.com/hajimehoshi/ebiten.git
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141 lines
4.7 KiB
HTML
141 lines
4.7 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/paint.png">
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<meta name="description" content="Ebiten example - paint">
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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 - paint</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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<li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</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 - paint</h2>
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<iframe src="paint.content.html" width="640" height="480"></iframe>
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<div class="card"><pre class="card-body"><code class="language-go">// +build example jsgo
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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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"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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count int
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brushImage *ebiten.Image
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canvasImage *ebiten.Image
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)
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func init() {
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const (
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a0 = 0x40
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a1 = 0xc0
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a2 = 0xff
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)
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pixels := []uint8{
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a0, a1, a1, a0,
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a1, a2, a2, a1,
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a1, a2, a2, a1,
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a0, a1, a1, a0,
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}
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brushImage, _ = ebiten.NewImageFromImage(&image.Alpha{
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Pix: pixels,
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Stride: 4,
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Rect: image.Rect(0, 0, 4, 4),
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}, ebiten.FilterDefault)
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canvasImage, _ = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterDefault)
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canvasImage.Fill(color.White)
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}
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// paint draws the brush on the given canvas image at the position (x, y).
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func paint(canvas *ebiten.Image, x, y int) {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(x), float64(y))
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// Scale the color and rotate the hue so that colors vary on each frame.
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op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
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theta := 2.0 * math.Pi * float64(count%ebiten.FPS) / ebiten.FPS
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op.ColorM.RotateHue(theta)
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canvas.DrawImage(brushImage, op)
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}
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func update(screen *ebiten.Image) error {
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drawn := false
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// Paint the brush by mouse dragging
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mx, my := ebiten.CursorPosition()
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if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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paint(canvasImage, mx, my)
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drawn = true
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}
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// Paint the brush by touches
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for _, t := range ebiten.Touches() {
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x, y := t.Position()
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paint(canvasImage, x, y)
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drawn = true
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}
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if drawn {
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count++
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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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screen.DrawImage(canvasImage, nil)
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msg := fmt.Sprintf("(%d, %d)", mx, my)
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for _, t := range ebiten.Touches() {
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x, y := t.Position()
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msg += fmt.Sprintf("\n(%d, %d) touch %d", x, y, t.ID())
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}
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ebitenutil.DebugPrint(screen, msg)
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return nil
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}
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func main() {
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Paint (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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