ebiten/docs/examples/sprites.html
2017-08-18 01:22:19 +09:00

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<title>Ebiten example - sprites</title>
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<h2>Ebiten example - sprites</h2>
<iframe src="sprites.content.html" width="640" height="480"></iframe>
<pre class="card"><div class="card-body"><code class="language-go">// &#43;build example
package main
import (
&#34;fmt&#34;
_ &#34;image/png&#34;
&#34;log&#34;
&#34;math&#34;
&#34;math/rand&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
maxAngle = 256
)
var (
ebitenImage *ebiten.Image
)
type Sprite struct {
imageWidth int
imageHeight int
x int
y int
vx int
vy int
angle 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
} else if screenWidth &lt;= s.x&#43;s.imageWidth {
s.x = 2*(screenWidth-s.imageWidth) - s.x
s.vx = -s.vx
}
if s.y &lt; 0 {
s.y = -s.y
s.vy = -s.vy
} else if screenHeight &lt;= s.y&#43;s.imageHeight {
s.y = 2*(screenHeight-s.imageHeight) - s.y
s.vy = -s.vy
}
s.angle&#43;&#43;
s.angle %= maxAngle
}
type Sprites struct {
sprites []*Sprite
num int
}
func (s *Sprites) Update() {
for _, sprite := range s.sprites {
sprite.Update()
}
}
const (
MinSprites = 0
MaxSprites = 50000
)
var (
sprites = &amp;Sprites{make([]*Sprite, MaxSprites), 500}
op = &amp;ebiten.DrawImageOptions{}
)
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()
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)
}
msg := fmt.Sprintf(`FPS: %0.2f
Num of sprites: %d
Press &lt;- or -&gt; to change the number of sprites`, ebiten.CurrentFPS(), sprites.num)
ebitenutil.DebugPrint(screen, msg)
return nil
}
func main() {
var err error
img, _, err := ebitenutil.NewImageFromFile(&#34;_resources/images/ebiten.png&#34;, ebiten.FilterNearest)
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)
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)
sprites.sprites[i] = &amp;Sprite{
imageWidth: w,
imageHeight: h,
x: x,
y: y,
vx: vx,
vy: vy,
angle: a,
}
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Sprites (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></div></pre>
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