<!DOCTYPE html> <script src="../scripts/force-https.js"></script> <link rel="shortcut icon" href="../favicon.png" type="image/png" > <link rel="icon" href="../favicon.png" type="image/png" > <title>Ebiten example - hsv</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> <header class="navbar"><div class="container"> <div class="navbar-header"> <a class="navbar-brand" href="..">Ebiten</a> </div> <nav class="collapse navbar-collapse"> <ul class="nav navbar-nav navbar-right"> <li><a href="https://github.com/hajimehoshi/ebiten">GitHub</a></li> <li><a href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li> <li><a href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a> </ul> </nav> </header> <main><div class="container"> <h2>Ebiten example - hsv</h2> <iframe src="hsv.content.html" width="640" height="480"></iframe> <pre><code class="language-go">// +build example package main import ( "fmt" _ "image/jpeg" "log" "math" "github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten/ebitenutil" ) const ( screenWidth = 320 screenHeight = 240 ) var ( hueInt = 0 saturationInt = 128 valueInt = 128 gophersImage *ebiten.Image ) func clamp(v, min, max int) int { if min > max { panic("min must <= max") } if v < min { return min } if max < v { return max } return v } func update(screen *ebiten.Image) error { if ebiten.IsKeyPressed(ebiten.KeyQ) { hueInt-- } if ebiten.IsKeyPressed(ebiten.KeyW) { hueInt++ } if ebiten.IsKeyPressed(ebiten.KeyA) { saturationInt-- } if ebiten.IsKeyPressed(ebiten.KeyS) { saturationInt++ } if ebiten.IsKeyPressed(ebiten.KeyZ) { valueInt-- } if ebiten.IsKeyPressed(ebiten.KeyX) { valueInt++ } hueInt = clamp(hueInt, -256, 256) saturationInt = clamp(saturationInt, 0, 256) valueInt = clamp(valueInt, 0, 256) w, h := gophersImage.Size() op := &ebiten.DrawImageOptions{} op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2) hue := float64(hueInt) * 2 * math.Pi / 128 saturation := float64(saturationInt) / 128 value := float64(valueInt) / 128 op.ColorM.ChangeHSV(hue, saturation, value) if err := screen.DrawImage(gophersImage, op); err != nil { return err } msg := fmt.Sprintf(`Hue: %0.2f [Q][W] Saturation: %0.2f [A][S] Value: %0.2f [Z][X]`, hue, saturation, value) if err := ebitenutil.DebugPrint(screen, msg); err != nil { return err } 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, "HSV (Ebiten Demo)"); err != nil { log.Fatal(err) } } </code></pre> </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>