mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
115 lines
4.4 KiB
HTML
115 lines
4.4 KiB
HTML
<!DOCTYPE html>
|
|
<meta charset="utf-8">
|
|
<meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/perspective.png">
|
|
<meta name="description" content="Ebiten example - perspective">
|
|
<link rel="shortcut icon" href="../favicon.png" type="image/png" >
|
|
<link rel="icon" href="../favicon.png" type="image/png" >
|
|
<title>Ebiten example - perspective</title>
|
|
|
|
<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>
|
|
|
|
<nav class="navbar"><div class="container">
|
|
<nav class="d-flex flex-row" style="width: 100%;">
|
|
<div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div>
|
|
<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>
|
|
<li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a>
|
|
</ul>
|
|
</nav>
|
|
</div></nav>
|
|
|
|
<main><div class="container">
|
|
|
|
<h2>Ebiten example - perspective</h2>
|
|
<iframe src="perspective.content.html" width="640" height="480"></iframe>
|
|
<div class="card"><pre class="card-body"><code class="language-go">// +build example jsgo
|
|
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"image"
|
|
_ "image/jpeg"
|
|
"log"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/examples/resources/images"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
gophersImage *ebiten.Image
|
|
)
|
|
|
|
func update(screen *ebiten.Image) error {
|
|
if ebiten.IsRunningSlowly() {
|
|
return nil
|
|
}
|
|
|
|
// Split the image into horizontal lines and draw them with different scales.
|
|
op := &ebiten.DrawImageOptions{}
|
|
w, h := gophersImage.Size()
|
|
for i := 0; i < h; i++ {
|
|
op.GeoM.Reset()
|
|
|
|
// Move the image's center to the upper-left corner.
|
|
op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
|
|
|
|
// Scale each lines and adjust the position.
|
|
lineW := w + i*3/4
|
|
x := -float64(lineW) / float64(w) / 2
|
|
op.GeoM.Scale(float64(lineW)/float64(w), 1)
|
|
op.GeoM.Translate(x, float64(i))
|
|
|
|
// Move the image's center to the screen's center.
|
|
op.GeoM.Translate(screenWidth/2, screenHeight/2)
|
|
|
|
r := image.Rect(0, i, w, i+1)
|
|
op.SourceRect = &r
|
|
screen.DrawImage(gophersImage, op)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
// 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.Gophers_jpg))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
gophersImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
|
|
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Perspective (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|
|
</code></pre></div>
|
|
|
|
</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>
|