<!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 package main import ( "image" _ "image/jpeg" "log" "github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten/ebitenutil" ) 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() { var err error gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterDefault) if err != nil { log.Fatal(err) } 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>