mirror of
https://github.com/hajimehoshi/ebiten.git
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163 lines
5.2 KiB
HTML
163 lines
5.2 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/hsv.png">
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<meta name="description" content="Ebiten example - hsv">
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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 - hsv</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 - hsv</h2>
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<iframe src="hsv.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/jpeg"
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"log"
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"math"
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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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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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hue128 = 0
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saturation128 = 128
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value128 = 128
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inverted = false
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prevPressedI = false
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gophersImage *ebiten.Image
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)
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// clamp clamps v to the range [min, max].
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func clamp(v, min, max int) int {
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if min > max {
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panic("min must <= max")
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}
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if v < min {
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return min
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}
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if max < v {
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return max
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}
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return v
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}
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func update(screen *ebiten.Image) error {
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// Adjust HSV values along with the user's input.
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if ebiten.IsKeyPressed(ebiten.KeyQ) {
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hue128--
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}
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if ebiten.IsKeyPressed(ebiten.KeyW) {
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hue128++
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}
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if ebiten.IsKeyPressed(ebiten.KeyA) {
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saturation128--
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}
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if ebiten.IsKeyPressed(ebiten.KeyS) {
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saturation128++
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}
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if ebiten.IsKeyPressed(ebiten.KeyZ) {
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value128--
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}
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if ebiten.IsKeyPressed(ebiten.KeyX) {
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value128++
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}
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hue128 = clamp(hue128, -256, 256)
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saturation128 = clamp(saturation128, 0, 256)
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value128 = clamp(value128, 0, 256)
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pressedI := ebiten.IsKeyPressed(ebiten.KeyI)
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if pressedI && !prevPressedI {
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inverted = !inverted
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}
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prevPressedI = pressedI
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if ebiten.IsRunningSlowly() {
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return nil
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}
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// Center the image on the screen.
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w, h := gophersImage.Size()
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2)
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// Change HSV.
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hue := float64(hue128) * 2 * math.Pi / 128
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saturation := float64(saturation128) / 128
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value := float64(value128) / 128
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op.ColorM.ChangeHSV(hue, saturation, value)
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// Invert the color.
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if inverted {
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op.ColorM.Scale(-1, -1, -1, 1)
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op.ColorM.Translate(1, 1, 1, 0)
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}
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screen.DrawImage(gophersImage, op)
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// Draw the text of the current status.
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msgInverted := "false"
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if inverted {
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msgInverted = "true"
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}
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msg := fmt.Sprintf(`Hue: %0.2f [Q][W]
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Saturation: %0.2f [A][S]
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Value: %0.2f [Z][X]
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Inverted: %s [I]`, hue, saturation, value, msgInverted)
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ebitenutil.DebugPrint(screen, msg)
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return nil
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}
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func main() {
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var err error
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gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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if err := ebiten.Run(update, screenWidth, screenHeight, 2, "HSV (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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