ebiten/docs/examples/infinitescroll.html

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<!DOCTYPE html>
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<title>Ebiten example - infinitescroll</title>
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<main><div class="container">
<h2>Ebiten example - infinitescroll</h2>
<iframe src="infinitescroll.content.html" width="640" height="480"></iframe>
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<pre class="card"><div class="card-body"><code class="language-go">// &#43;build example
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package main
import (
&#34;fmt&#34;
_ &#34;image/png&#34;
&#34;log&#34;
&#34;math&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
theViewport = &amp;viewport{}
bgImage *ebiten.Image
repeatedBgImage *ebiten.Image
groundImage *ebiten.Image
)
type viewport struct {
x16 int
y16 int
}
func round(x float64) float64 {
return math.Floor(x &#43; 0.5)
}
func (p *viewport) Move() {
w, h := bgImage.Size()
mx := w * 16
my := h * 16
p.x16 &#43;= w / 32
p.y16 &#43;= h / 32
for mx &lt;= p.x16 {
p.x16 -= mx
}
for my &lt;= p.y16 {
p.y16 -= my
}
for p.x16 &lt; 0 {
p.x16 &#43;= mx
}
for p.y16 &lt; 0 {
p.y16 &#43;= my
}
}
func (p *viewport) Position() (int, int) {
return p.x16, p.y16
}
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func updateGroundImage(ground *ebiten.Image) {
ground.Clear()
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x16, y16 := theViewport.Position()
op := &amp;ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(-x16)/16, float64(-y16)/16)
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ground.DrawImage(repeatedBgImage, op)
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}
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func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) {
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op := &amp;ebiten.DrawImageOptions{}
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screen.DrawImage(ground, op)
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}
func update(screen *ebiten.Image) error {
theViewport.Move()
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if ebiten.IsRunningSlowly() {
return nil
}
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updateGroundImage(groundImage)
drawGroundImage(screen, groundImage)
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msg := fmt.Sprintf(&#34;FPS: %0.2f&#34;, ebiten.CurrentFPS())
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ebitenutil.DebugPrint(screen, msg)
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return nil
}
func main() {
var err error
bgImage, _, err = ebitenutil.NewImageFromFile(&#34;_resources/images/tile.png&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
w, h := bgImage.Size()
const repeat = 5
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repeatedBgImage, _ = ebiten.NewImage(w*repeat, h*repeat, ebiten.FilterNearest)
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for j := 0; j &lt; repeat; j&#43;&#43; {
for i := 0; i &lt; repeat; i&#43;&#43; {
op := &amp;ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(w*i), float64(h*j))
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repeatedBgImage.DrawImage(bgImage, op)
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}
}
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groundImage, _ = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Infinite Scroll (Ebiten Demo)&#34;); err != nil {
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log.Fatal(err)
}
}
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</code></div></pre>
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<p>© 2013 Hajime Hoshi</p>
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