mirror of
https://github.com/hajimehoshi/ebiten.git
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189 lines
5.4 KiB
HTML
189 lines
5.4 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 - sprites</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 - sprites</h2>
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<iframe src="sprites.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/rand"
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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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ebitenImage *ebiten.Image
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ebitenImageWidth = 0
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ebitenImageHeight = 0
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)
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type Sprite struct {
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image *ebiten.Image
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x int
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y int
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vx int
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vy int
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}
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func (s *Sprite) Update() {
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s.x += s.vx
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s.y += s.vy
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if s.x < 0 {
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s.x = -s.x
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s.vx = -s.vx
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}
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if s.y < 0 {
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s.y = -s.y
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s.vy = -s.vy
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}
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w, h := s.image.Size()
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if screenWidth <= s.x+w {
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s.x = 2*(screenWidth-w) - s.x
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s.vx = -s.vx
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}
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if screenHeight <= s.y+h {
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s.y = 2*(screenHeight-h) - s.y
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s.vy = -s.vy
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}
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}
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type Sprites struct {
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sprites []*Sprite
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num int
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}
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func (s Sprites) Update() {
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for _, sprite := range s.sprites {
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sprite.Update()
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}
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}
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func (s Sprites) Len() int {
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return s.num
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}
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func (s Sprites) Dst(i int) (x0, y0, x1, y1 int) {
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if s.num <= i {
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return 0, 0, 0, 0
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}
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ss := s.sprites[i]
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return ss.x, ss.y, ss.x + ebitenImageWidth, ss.y + ebitenImageHeight
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}
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func (s Sprites) Src(i int) (x0, y0, x1, y1 int) {
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if s.num <= i {
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return 0, 0, 0, 0
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}
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return 0, 0, ebitenImageWidth, ebitenImageHeight
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}
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const (
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MinSprites = 0
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MaxSprites = 50000
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)
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var sprites = &Sprites{make([]*Sprite, MaxSprites), 500}
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func update(screen *ebiten.Image) error {
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if ebiten.IsKeyPressed(ebiten.KeyLeft) {
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sprites.num -= 20
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if sprites.num < MinSprites {
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sprites.num = MinSprites
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}
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}
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if ebiten.IsKeyPressed(ebiten.KeyRight) {
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sprites.num += 20
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if MaxSprites < sprites.num {
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sprites.num = MaxSprites
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}
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}
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sprites.Update()
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if ebiten.IsRunningSlowly() {
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return nil
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}
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op := &ebiten.DrawImageOptions{
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ImageParts: sprites,
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}
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op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
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if err := screen.DrawImage(ebitenImage, op); err != nil {
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return err
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}
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msg := fmt.Sprintf(`FPS: %0.2f
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Num of sprites: %d
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Press <- or -> to change the number of sprites`, ebiten.CurrentFPS(), sprites.Len())
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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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ebitenImage, _, err = ebitenutil.NewImageFromFile("_resources/images/ebiten.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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ebitenImageWidth, ebitenImageHeight = ebitenImage.Size()
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for i := range sprites.sprites {
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w, h := ebitenImage.Size()
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x, y := rand.Intn(screenWidth-w), rand.Intn(screenHeight-h)
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vx, vy := 2*rand.Intn(2)-1, 2*rand.Intn(2)-1
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sprites.sprites[i] = &Sprite{
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image: ebitenImage,
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x: x,
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y: y,
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vx: vx,
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vy: vy,
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}
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Sprites (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>
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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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