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<!DOCTYPE html>
< link rel = "shortcut icon" href = "../favicon.png" type = "image/png" >
< link rel = "icon" href = "../favicon.png" type = "image/png" >
< title > Ebiten example - alphablending< / 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 - alphablending< / h2 >
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< iframe src = "alphablending.content.html" width = "640" height = "480" > < / iframe >
< pre > < code > // + build example
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package main
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import (
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" image/color"
_ " image/png"
" log"
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" github.com/hajimehoshi/ebiten"
" github.com/hajimehoshi/ebiten/ebitenutil"
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)
const (
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screenWidth = 320
screenHeight = 240
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)
var (
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count int
ebitenImage *ebiten.Image
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)
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type imageParts struct {
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diff float64
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}
func (p *imageParts) Src(i int) (int, int, int, int) {
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w, h := ebitenImage.Size()
return 0, 0, w, h
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}
func (p *imageParts) Dst(i int) (int, int, int, int) {
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x := int(float64(i%10)*p.diff + 15)
y := int(float64(i/10)*p.diff + 20)
w, h := ebitenImage.Size()
return x, y, x + w, y + h
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}
func (p *imageParts) Len() int {
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return 10 * 10
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}
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func update(screen *ebiten.Image) error {
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count+ +
count %= ebiten.FPS * 10
diff := float64(count) * 0.2
switch {
case 480 < count:
diff = 0
case 240 < count:
diff = float64(480-count) * 0.2
}
if err := screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff}); err != nil {
return err
}
op := & ebiten.DrawImageOptions{}
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
op.ImageParts = & imageParts{
diff: diff,
}
if err := screen.DrawImage(ebitenImage, op); err != nil {
return err
}
return nil
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}
func main() {
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var err error
ebitenImage, _, err = ebitenutil.NewImageFromFile(" _resources/images/ebiten.png" , ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, " Alpha Blending (Ebiten Demo)" ); err != nil {
log.Fatal(err)
}
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}
< / 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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