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<!DOCTYPE html>
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< meta charset = "utf-8" >
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< meta property = "og:image" itemprop = "image primaryImageOfPage" content = "https://hajimehoshi.github.io/ebiten/images/examples/infinitescroll.png" >
< meta name = "description" content = "Ebiten example - infinitescroll" >
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< link rel = "shortcut icon" href = "../favicon.png" type = "image/png" >
< link rel = "icon" href = "../favicon.png" type = "image/png" >
< title > Ebiten example - infinitescroll< / title >
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< link rel = "stylesheet" href = "../stylesheets/bootstrap.min.css" >
< link rel = "stylesheet" href = "../stylesheets/highlight-github.css" >
< link rel = "stylesheet" href = "../stylesheets/ebiten.css" >
< script src = "../scripts/googleanalytics.js" > < / script >
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< nav class = "navbar" > < div class = "container" >
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< nav class = "d-flex flex-row" style = "width: 100%;" >
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< div class = "nav mr-auto" > < a class = "navbar-brand" href = "../" > < img src = "../images/logo_white.svg" alt = "EBITEN" > < / a > < / div >
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< ul class = "nav" >
< li class = "nav-item" > < a class = "nav-link" href = "https://github.com/hajimehoshi/ebiten" > GitHub< / a > < / li >
< li class = "nav-item" > < a class = "nav-link" href = "https://godoc.org/github.com/hajimehoshi/ebiten" > GoDoc< / a > < / li >
< li class = "nav-item" > < a class = "nav-link" href = "https://github.com/hajimehoshi/ebiten/wiki" > Wiki< / a >
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< li class = "nav-item" > < a class = "nav-link" href = "https://ebiten-playground.github.io/" > Playground< / a >
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< / ul >
< / nav >
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< / div > < / nav >
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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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< div class = "card" > < pre class = "card-body" > < code class = "language-go" > // + build example
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package main
import (
" fmt"
_ " image/png"
" log"
" github.com/hajimehoshi/ebiten"
" github.com/hajimehoshi/ebiten/ebitenutil"
)
const (
screenWidth = 320
screenHeight = 240
)
var (
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bgImage *ebiten.Image
)
func init() {
var err error
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bgImage, _, err = ebitenutil.NewImageFromFile(" _resources/images/tile.png" , ebiten.FilterDefault)
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if err != nil {
log.Fatal(err)
}
}
var (
theViewport = & viewport{}
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)
type viewport struct {
x16 int
y16 int
}
func (p *viewport) Move() {
w, h := bgImage.Size()
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maxX16 := w * 16
maxY16 := h * 16
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p.x16 + = w / 32
p.y16 + = h / 32
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p.x16 %= maxX16
p.y16 %= maxY16
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}
func (p *viewport) Position() (int, int) {
return p.x16, p.y16
}
func update(screen *ebiten.Image) error {
theViewport.Move()
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if ebiten.IsRunningSlowly() {
return nil
}
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x16, y16 := theViewport.Position()
offsetX, offsetY := float64(-x16)/16, float64(-y16)/16
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// Draw bgImage on the screen repeatedly.
const repeat = 3
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w, h := bgImage.Size()
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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op.GeoM.Translate(offsetX, offsetY)
screen.DrawImage(bgImage, op)
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}
}
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ebitenutil.DebugPrint(screen, fmt.Sprintf(" FPS: %0.2f" , ebiten.CurrentFPS()))
return nil
}
func main() {
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, " Infinite Scroll (Ebiten Demo)" ); err != nil {
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log.Fatal(err)
}
}
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< / code > < / pre > < / div >
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< / div > < / main >
< footer > < div class = "container" >
< p > © 2013 Hajime Hoshi< / p >
< p > Code is licensed under < a href = "https://github.com/hajimehoshi/ebiten/blob/master/LICENSE" > the Apache License 2.0< / a > .< / p >
< p > The content of this page is licensed under < a href = "https://creativecommons.org/licenses/by/4.0/" > the Creative Commons Attribution 4.0 License< / a > .< / p >
< / div > < / footer >
< script src = "../scripts/highlight.pack.js" > < / script >
< script > hljs . initHighlightingOnLoad ( ) ; < / script >
