<!DOCTYPE html> <meta charset="utf-8"> <meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/rotate.png"> <meta name="description" content="Ebiten example - rotate"> <link rel="shortcut icon" href="../favicon.png" type="image/png" > <link rel="icon" href="../favicon.png" type="image/png" > <title>Ebiten example - rotate</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 - rotate</h2> <iframe src="rotate.content.html" width="640" height="480"></iframe> <div class="card"><pre class="card-body"><code class="language-go">// +build example package main import ( _ "image/jpeg" "log" "math" "github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten/ebitenutil" ) const ( screenWidth = 320 screenHeight = 240 ) var ( count int gophersImage *ebiten.Image ) func update(screen *ebiten.Image) error { count++ if ebiten.IsRunningSlowly() { return nil } w, h := gophersImage.Size() op := &ebiten.DrawImageOptions{} op.GeoM.Translate(-float64(w)/2, -float64(h)/2) op.GeoM.Rotate(float64(count%360) * 2 * math.Pi / 360) op.GeoM.Translate(screenWidth/2, screenHeight/2) screen.DrawImage(gophersImage, op) return nil } func main() { var err error gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest) if err != nil { log.Fatal(err) } if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Rotate (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>