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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/alphablending.png" >
< meta name = "description" content = "Ebiten example - alphablending" >
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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 - alphablending< / 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" >
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< 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" >
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< h2 > Ebiten example - alphablending< / h2 >
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< iframe src = "alphablending.content.html" width = "640" height = "480" > < / iframe >
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< div class = "card" > < pre class = "card-body" > < code class = "language-go" > // + build example jsgo
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package main
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import (
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" bytes"
" image"
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" image/color"
_ " image/png"
" log"
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" github.com/hajimehoshi/ebiten"
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" github.com/hajimehoshi/ebiten/examples/resources/images"
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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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)
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
}
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if ebiten.IsRunningSlowly() {
return nil
}
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screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff})
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// Draw 100 Ebitens
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op := & ebiten.DrawImageOptions{}
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
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for i := 0; i < 10*10; i+ + {
op.GeoM.Reset()
x := float64(i%10)*diff + 15
y := float64(i/10)*diff + 20
op.GeoM.Translate(x, y)
screen.DrawImage(ebitenImage, op)
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}
return nil
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}
func main() {
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// Decode image from a byte slice instead of a file so that
// this example works in any working directory.
// If you want to use a file, there are some options:
// 1) Use os.Open and pass the file to the image decoder.
// This is a very regular way, but doesn' t work on browsers.
// 2) Use ebitenutil.OpenFile and pass the file to the image decoder.
// This works even on browsers.
// 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file.
// This also works on browsers.
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
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if err != nil {
log.Fatal(err)
}
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ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, " Alpha Blending (Ebiten Demo)" ); err != nil {
log.Fatal(err)
}
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}
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< / code > < / pre > < / div >
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< / div > < / main >
< footer > < div class = "container" >
< p > © 2013 Hajime Hoshi< / p >
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< p > Code is licensed under < a href = "https://github.com/hajimehoshi/ebiten/blob/master/LICENSE" > the Apache License 2.0< / a > .< / p >
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< 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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< script src = "../scripts/highlight.pack.js" > < / script >
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< script > hljs . initHighlightingOnLoad ( ) ; < / script >
