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< title > Ebiten example - infinitescroll< / title >
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< h2 > Ebiten example - infinitescroll< / h2 >
< iframe src = "infinitescroll.content.html" width = "640" height = "480" > < / iframe >
< pre > < code class = "language-go" > // + build example
package main
import (
" fmt"
_ " image/png"
" log"
" math"
" github.com/hajimehoshi/ebiten"
" github.com/hajimehoshi/ebiten/ebitenutil"
)
const (
screenWidth = 320
screenHeight = 240
)
var (
theViewport = & 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 + 0.5)
}
func (p *viewport) Move() {
w, h := bgImage.Size()
mx := w * 16
my := h * 16
p.x16 + = w / 32
p.y16 + = h / 32
for mx < = p.x16 {
p.x16 -= mx
}
for my < = p.y16 {
p.y16 -= my
}
for p.x16 < 0 {
p.x16 + = mx
}
for p.y16 < 0 {
p.y16 + = 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 := & 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 := & 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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updateGroundImage(groundImage)
drawGroundImage(screen, groundImage)
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msg := fmt.Sprintf(" FPS: %0.2f" , 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(" _resources/images/tile.png" , 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 < repeat; j+ + {
for i := 0; i < repeat; i+ + {
op := & 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, " infinite scroll" ); err != nil {
log.Fatal(err)
}
}
< / code > < / pre >
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< p > © 2013 Hajime Hoshi< / p >
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