ebiten/_docs/public/examples/sprites.html

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Copyright 2014 Hajime Hoshi
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<title>Ebiten example - sprites</title>
<style>
body {
font-family: sans-serif;
}
iframe {
border-color: #999;
border-style: solid;
border-width: 1px;
overflow: hidden;
}
pre {
background: #eee;
padding: 1em;
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<nav><a href="..">Ebiten</a></nav>
<h1>Ebiten example - sprites</h1>
<iframe src="sprites.content.html" width="640" height="480"></iframe>
<pre><code>package main
import (
&#34;fmt&#34;
_ &#34;image/png&#34;
&#34;log&#34;
&#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 (
screenWidth = 320
screenHeight = 240
)
var (
ebitenImage *ebiten.Image
ebitenImageWidth = 0
ebitenImageHeight = 0
)
type Sprite struct {
image *ebiten.Image
x int
y int
vx int
vy int
}
func (s *Sprite) Update() {
s.x &#43;= s.vx
s.y &#43;= s.vy
if s.x &lt; 0 {
s.x = -s.x
s.vx = -s.vx
}
if s.y &lt; 0 {
s.y = -s.y
s.vy = -s.vy
}
w, h := s.image.Size()
if screenWidth &lt;= s.x&#43;w {
s.x = 2*(screenWidth-w) - s.x
s.vx = -s.vx
}
if screenHeight &lt;= s.y&#43;h {
s.y = 2*(screenHeight-h) - s.y
s.vy = -s.vy
}
}
type Sprites struct {
sprites []*Sprite
num int
}
func (s Sprites) Update() {
for _, sprite := range s.sprites {
sprite.Update()
}
}
func (s Sprites) Len() int {
return s.num
}
func (s Sprites) Dst(i int) (x0, y0, x1, y1 int) {
if s.num &lt;= i {
return 0, 0, 0, 0
}
ss := s.sprites[i]
return ss.x, ss.y, ss.x &#43; ebitenImageWidth, ss.y &#43; ebitenImageHeight
}
func (s Sprites) Src(i int) (x0, y0, x1, y1 int) {
if s.num &lt;= i {
return 0, 0, 0, 0
}
return 0, 0, ebitenImageWidth, ebitenImageHeight
}
const (
MinSprites = 0
MaxSprites = 10000
)
var sprites = &amp;Sprites{make([]*Sprite, MaxSprites), 500}
func update(screen *ebiten.Image) error {
if ebiten.IsKeyPressed(ebiten.KeyLeft) {
sprites.num -= 20
if sprites.num &lt; MinSprites {
sprites.num = MinSprites
}
}
if ebiten.IsKeyPressed(ebiten.KeyRight) {
sprites.num &#43;= 20
if MaxSprites &lt; sprites.num {
sprites.num = MaxSprites
}
}
sprites.Update()
op := &amp;ebiten.DrawImageOptions{
ImageParts: sprites,
}
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
if err := screen.DrawImage(ebitenImage, op); err != nil {
return err
}
msg := fmt.Sprintf(`FPS: %0.2f
Num of sprites: %d
Press &lt;- or -&gt; to change the number of sprites`, ebiten.CurrentFPS(), sprites.Len())
ebitenutil.DebugPrint(screen, msg)
return nil
}
func main() {
var err error
ebitenImage, _, err = ebitenutil.NewImageFromFile(&#34;images/ebiten.png&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
ebitenImageWidth, ebitenImageHeight = ebitenImage.Size()
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
sprites.sprites[i] = &amp;Sprite{
image: ebitenImage,
x: x,
y: y,
vx: vx,
vy: vy,
}
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Sprites (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></pre>
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