ebiten/docs/examples/sprites.html

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<!DOCTYPE html>
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - sprites</title>
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<header class="navbar"><div class="container">
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<a class="navbar-brand" href="..">Ebiten</a>
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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">// &#43;build example
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package main
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import (
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&#34;fmt&#34;
_ &#34;image/png&#34;
&#34;log&#34;
&#34;math&#34;
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&#34;math/rand&#34;
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&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
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)
const (
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screenWidth = 320
screenHeight = 240
maxAngle = 256
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)
var (
ebitenImage *ebiten.Image
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)
type Sprite struct {
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imageWidth int
imageHeight int
x int
y int
vx int
vy int
angle int
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}
func (s *Sprite) Update() {
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s.x &#43;= s.vx
s.y &#43;= s.vy
if s.x &lt; 0 {
s.x = -s.x
s.vx = -s.vx
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} else if screenWidth &lt;= s.x&#43;s.imageWidth {
s.x = 2*(screenWidth-s.imageWidth) - s.x
s.vx = -s.vx
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}
if s.y &lt; 0 {
s.y = -s.y
s.vy = -s.vy
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} else if screenHeight &lt;= s.y&#43;s.imageHeight {
s.y = 2*(screenHeight-s.imageHeight) - s.y
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s.vy = -s.vy
}
s.angle&#43;&#43;
s.angle %= maxAngle
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}
type Sprites struct {
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sprites []*Sprite
num int
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}
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func (s *Sprites) Update() {
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for _, sprite := range s.sprites {
sprite.Update()
}
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}
const (
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MinSprites = 0
MaxSprites = 50000
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)
var (
sprites = &amp;Sprites{make([]*Sprite, MaxSprites), 500}
op = &amp;ebiten.DrawImageOptions{}
)
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func update(screen *ebiten.Image) error {
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if ebiten.IsKeyPressed(ebiten.KeyLeft) {
sprites.num -= 20
if sprites.num &lt; MinSprites {
sprites.num = MinSprites
}
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}
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if ebiten.IsKeyPressed(ebiten.KeyRight) {
sprites.num &#43;= 20
if MaxSprites &lt; sprites.num {
sprites.num = MaxSprites
}
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}
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sprites.Update()
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if ebiten.IsRunningSlowly() {
return nil
}
w, h := ebitenImage.Size()
for i := 0; i &lt; sprites.num; i&#43;&#43; {
s := sprites.sprites[i]
op.GeoM.Reset()
op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
op.GeoM.Rotate(2 * math.Pi * float64(s.angle) / maxAngle)
op.GeoM.Translate(float64(w)/2, float64(h)/2)
op.GeoM.Translate(float64(s.x), float64(s.y))
screen.DrawImage(ebitenImage, op)
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}
msg := fmt.Sprintf(`FPS: %0.2f
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Num of sprites: %d
Press &lt;- or -&gt; to change the number of sprites`, ebiten.CurrentFPS(), sprites.num)
if err := ebitenutil.DebugPrint(screen, msg); err != nil {
return err
}
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return nil
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}
func main() {
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var err error
img, _, err := ebitenutil.NewImageFromFile(&#34;_resources/images/ebiten.png&#34;, ebiten.FilterNearest)
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if err != nil {
log.Fatal(err)
}
w, h := img.Size()
ebitenImage, _ = ebiten.NewImage(w, h, ebiten.FilterNearest)
op := &amp;ebiten.DrawImageOptions{}
op.ColorM.Scale(1, 1, 1, 0.5)
ebitenImage.DrawImage(img, op)
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for i := range sprites.sprites {
w, h := ebitenImage.Size()
x, y := rand.Intn(screenWidth-w), rand.Intn(screenHeight-h)
vx, vy := 2*rand.Intn(2)-1, 2*rand.Intn(2)-1
a := rand.Intn(maxAngle)
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sprites.sprites[i] = &amp;Sprite{
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imageWidth: w,
imageHeight: h,
x: x,
y: y,
vx: vx,
vy: vy,
angle: a,
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}
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Sprites (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
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}
</code></pre>
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</div></main>
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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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