ebiten/docs/examples/infinitescroll.html
2016-09-03 02:54:17 +09:00

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<h2>Ebiten example - infinitescroll</h2>
<iframe src="infinitescroll.content.html" width="640" height="480"></iframe>
<pre><code class="language-go">// &#43;build example
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
}
func updateGroundImage(ground *ebiten.Image) error {
if err := ground.Clear(); err != nil {
return err
}
x16, y16 := theViewport.Position()
op := &amp;ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(-x16)/16, float64(-y16)/16)
if err := ground.DrawImage(repeatedBgImage, op); err != nil {
return err
}
return nil
}
func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) error {
op := &amp;ebiten.DrawImageOptions{}
if err := screen.DrawImage(ground, op); err != nil {
return err
}
return nil
}
func update(screen *ebiten.Image) error {
theViewport.Move()
if err := updateGroundImage(groundImage); err != nil {
return err
}
if err := drawGroundImage(screen, groundImage); err != nil {
return err
}
msg := fmt.Sprintf(&#34;FPS: %0.2f&#34;, ebiten.CurrentFPS())
if err := ebitenutil.DebugPrint(screen, msg); err != nil {
return err
}
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
repeatedBgImage, err = ebiten.NewImage(w*repeat, h*repeat, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
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))
if err := repeatedBgImage.DrawImage(bgImage, op); err != nil {
log.Fatal(err)
}
}
}
groundImage, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;infinite scroll&#34;); err != nil {
log.Fatal(err)
}
}
</code></pre>
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