ebiten/docs/examples/infinitescroll.html
2018-01-29 23:39:30 +09:00

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<h2>Ebiten example - infinitescroll</h2>
<iframe src="infinitescroll.content.html" width="640" height="480"></iframe>
<div class="card"><pre class="card-body"><code class="language-go">// &#43;build example
package main
import (
&#34;fmt&#34;
_ &#34;image/png&#34;
&#34;log&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
bgImage *ebiten.Image
)
func init() {
var err error
bgImage, _, err = ebitenutil.NewImageFromFile(&#34;_resources/images/tile.png&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
}
var (
theViewport = &amp;viewport{}
)
type viewport struct {
x16 int
y16 int
}
func (p *viewport) Move() {
w, h := bgImage.Size()
maxX16 := w * 16
maxY16 := h * 16
p.x16 &#43;= w / 32
p.y16 &#43;= h / 32
p.x16 %= maxX16
p.y16 %= maxY16
}
func (p *viewport) Position() (int, int) {
return p.x16, p.y16
}
func update(screen *ebiten.Image) error {
theViewport.Move()
if ebiten.IsRunningSlowly() {
return nil
}
x16, y16 := theViewport.Position()
offsetX, offsetY := float64(-x16)/16, float64(-y16)/16
// Draw bgImage on the screen repeatedly.
const repeat = 3
w, h := bgImage.Size()
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))
op.GeoM.Translate(offsetX, offsetY)
screen.DrawImage(bgImage, op)
}
}
ebitenutil.DebugPrint(screen, fmt.Sprintf(&#34;FPS: %0.2f&#34;, ebiten.CurrentFPS()))
return nil
}
func main() {
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;Infinite Scroll (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
}
</code></pre></div>
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