mirror of
https://github.com/hajimehoshi/ebiten.git
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148 lines
5.1 KiB
HTML
148 lines
5.1 KiB
HTML
<!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/highdpi.png">
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<meta name="description" content="Ebiten example - highdpi">
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<link rel="shortcut icon" href="../favicon.png" type="image/png" >
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<link rel="icon" href="../favicon.png" type="image/png" >
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<title>Ebiten example - highdpi</title>
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<link rel="stylesheet" href="../stylesheets/bootstrap.min.css">
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<link rel="stylesheet" href="../stylesheets/highlight-github.css">
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<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">
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<li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li>
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<li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li>
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<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>
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</nav>
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</div></nav>
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<main><div class="container">
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<h2>Ebiten example - highdpi</h2>
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<iframe src="highdpi.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
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import (
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"fmt"
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"image"
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_ "image/jpeg"
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"log"
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"net/http"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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)
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var (
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count int
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highDPIImage *ebiten.Image
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highDPIImageCh = make(chan *ebiten.Image)
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)
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func init() {
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// Licensed under Public Domain
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// https://commons.wikimedia.org/wiki/File:As08-16-2593.jpg
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const url = "https://upload.wikimedia.org/wikipedia/commons/1/1f/As08-16-2593.jpg"
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// Load the image asynchronously.
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go func() {
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res, err := http.Get(url)
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if err != nil {
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log.Fatal(err)
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}
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defer res.Body.Close()
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img, _, err := image.Decode(res.Body)
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if err != nil {
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log.Fatal(err)
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}
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eimg, err := ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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if err != nil {
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log.Fatal(err)
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}
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highDPIImageCh <- eimg
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close(highDPIImageCh)
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}()
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}
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func update(screen *ebiten.Image) error {
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if highDPIImage == nil {
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// Use select and 'default' clause for non-blocking receiving.
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select {
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case img := <-highDPIImageCh:
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highDPIImage = img
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default:
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}
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}
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if ebiten.IsRunningSlowly() {
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return nil
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}
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if highDPIImage == nil {
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ebitenutil.DebugPrint(screen, "Loading the image...")
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return nil
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}
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scale := ebiten.DeviceScaleFactor()
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sw, sh := screen.Size()
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w, h := highDPIImage.Size()
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op := &ebiten.DrawImageOptions{}
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// Move the images's center to the upper left corner.
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op.GeoM.Translate(float64(-w)/2, float64(-h)/2)
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// The image is just too big. Adjust the scale.
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op.GeoM.Scale(0.25, 0.25)
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// Scale the image by the device ratio so that the rendering result can be same
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// on various (diffrent-DPI) environments.
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op.GeoM.Scale(scale, scale)
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// Move the image's center to the screen's center.
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op.GeoM.Translate(float64(sw)/2, float64(sh)/2)
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op.Filter = ebiten.FilterLinear
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screen.DrawImage(highDPIImage, op)
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ebitenutil.DebugPrint(screen, fmt.Sprintf("Device Scale Ratio: %0.2f", scale))
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return nil
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}
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func main() {
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const (
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screenWidth = 640
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screenHeight = 480
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)
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// Pass the invert of scale so that Ebiten's auto scaling by device scale is disabled.
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s := ebiten.DeviceScaleFactor()
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if err := ebiten.Run(update, int(screenWidth*s), int(screenHeight*s), 1/s, "High DPI (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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</code></pre></div>
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</div></main>
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<footer><div class="container">
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<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>
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</div></footer>
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<script src="../scripts/highlight.pack.js"></script>
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<script>hljs.initHighlightingOnLoad();</script>
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