mirror of
https://github.com/hajimehoshi/ebiten.git
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169 lines
4.9 KiB
HTML
169 lines
4.9 KiB
HTML
<!DOCTYPE html>
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<script src="../scripts/force-https.js"></script>
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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 - infinitescroll</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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<header class="navbar"><div class="container">
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<div class="navbar-header">
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<a class="navbar-brand" href="..">Ebiten</a>
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</div>
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<nav class="collapse navbar-collapse">
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<ul class="nav navbar-nav navbar-right">
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<li><a href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
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<li><a href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
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<li><a href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a>
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</ul>
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</nav>
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</header>
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<main><div class="container">
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<h2>Ebiten example - infinitescroll</h2>
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<iframe src="infinitescroll.content.html" width="640" height="480"></iframe>
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<pre><code class="language-go">// +build example
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package main
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import (
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"fmt"
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_ "image/png"
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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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theViewport = &viewport{}
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bgImage *ebiten.Image
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repeatedBgImage *ebiten.Image
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groundImage *ebiten.Image
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)
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type viewport struct {
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x16 int
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y16 int
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}
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func round(x float64) float64 {
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return math.Floor(x + 0.5)
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}
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func (p *viewport) Move() {
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w, h := bgImage.Size()
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mx := w * 16
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my := h * 16
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p.x16 += w / 32
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p.y16 += h / 32
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for mx <= p.x16 {
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p.x16 -= mx
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}
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for my <= p.y16 {
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p.y16 -= my
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}
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for p.x16 < 0 {
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p.x16 += mx
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}
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for p.y16 < 0 {
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p.y16 += my
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}
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}
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func (p *viewport) Position() (int, int) {
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return p.x16, p.y16
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}
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func updateGroundImage(ground *ebiten.Image) error {
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if err := ground.Clear(); err != nil {
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return err
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}
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x16, y16 := theViewport.Position()
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(-x16)/16, float64(-y16)/16)
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if err := ground.DrawImage(repeatedBgImage, op); err != nil {
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return err
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}
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return nil
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}
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func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) error {
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op := &ebiten.DrawImageOptions{}
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if err := screen.DrawImage(ground, op); err != nil {
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return err
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}
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return nil
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}
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func update(screen *ebiten.Image) error {
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theViewport.Move()
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if err := updateGroundImage(groundImage); err != nil {
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return err
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}
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if err := drawGroundImage(screen, groundImage); err != nil {
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return err
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}
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msg := fmt.Sprintf("FPS: %0.2f", ebiten.CurrentFPS())
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if err := ebitenutil.DebugPrint(screen, msg); err != nil {
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return err
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}
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return nil
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}
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func main() {
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var err error
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bgImage, _, err = ebitenutil.NewImageFromFile("_resources/images/tile.png", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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w, h := bgImage.Size()
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const repeat = 5
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repeatedBgImage, err = ebiten.NewImage(w*repeat, h*repeat, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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for j := 0; j < repeat; j++ {
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for i := 0; i < repeat; i++ {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(w*i), float64(h*j))
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if err := repeatedBgImage.DrawImage(bgImage, op); err != nil {
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log.Fatal(err)
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}
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}
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}
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groundImage, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "infinite scroll"); err != nil {
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log.Fatal(err)
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}
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}
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</code></pre>
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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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