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<!DOCTYPE html>
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< link rel = "shortcut icon" href = "../favicon.png" type = "image/png" >
< link rel = "icon" href = "../favicon.png" type = "image/png" >
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< title > Ebiten example - perspective< / title >
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< link rel = "stylesheet" href = "/stylesheets/bootstrap.min.css" >
< link rel = "stylesheet" href = "/stylesheets/ebiten.css" >
< header class = "navbar" > < div class = "container" >
< div class = "navbar-header" >
< a class = "navbar-brand" href = "/" > Ebiten< / a >
< / div >
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< nav class = "collapse navbar-collapse" >
< ul class = "nav navbar-nav navbar-right" >
< li > < a href = "https://github.com/hajimehoshi/ebiten" > GitHub< / a > < / li >
< li > < a href = "http://godoc.org/github.com/hajimehoshi/ebiten" > GoDoc< / a > < / li >
< li > < a href = "https://github.com/hajimehoshi/ebiten/wiki" > Wiki< / a >
< / ul >
< / nav >
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< / header >
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< main > < div class = "container" >
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< h2 > Ebiten example - perspective< / h2 >
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< iframe src = "perspective.content.html" width = "640" height = "480" > < / iframe >
< pre > < code > // + build example
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package main
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import (
_ " image/jpeg"
" log"
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" github.com/hajimehoshi/ebiten"
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" github.com/hajimehoshi/ebiten/ebitenutil"
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)
const (
screenWidth = 320
screenHeight = 240
)
var (
gophersImage *ebiten.Image
)
type parts struct {
image *ebiten.Image
}
func (p parts) Len() int {
_, h := p.image.Size()
return h
}
func (p parts) Dst(i int) (x0, y0, x1, y1 int) {
w, h := p.image.Size()
width := w + i*3/4
x := ((h - i) * 3 / 4) / 2
return x, i, x + width, i + 1
}
func (p parts) Src(i int) (x0, y0, x1, y1 int) {
w, _ := p.image.Size()
return 0, i, w, i + 1
}
func update(screen *ebiten.Image) error {
op := & ebiten.DrawImageOptions{
ImageParts: & parts{gophersImage},
}
w, h := gophersImage.Size()
maxWidth := float64(w) + float64(h)*0.75
op.GeoM.Translate(-maxWidth/2, -float64(h)/2)
op.GeoM.Translate(screenWidth/2, screenHeight/2)
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if err := screen.DrawImage(gophersImage, op); err != nil {
return err
}
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return nil
}
func main() {
var err error
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gophersImage, _, err = ebitenutil.NewImageFromFile(" _resources/images/gophers.jpg" , ebiten.FilterNearest)
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if err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, " Perspective (Ebiten Demo)" ); err != nil {
log.Fatal(err)
}
}
< / code > < / pre >
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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" > 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 >
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