ebiten/docs/examples/hsv.html

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<!DOCTYPE html>
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<title>Ebiten example - hsv</title>
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<header class="navbar"><div class="container">
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<a class="navbar-brand" href="..">Ebiten</a>
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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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<pre><code class="language-go">// &#43;build example
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package main
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import (
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&#34;fmt&#34;
_ &#34;image/jpeg&#34;
&#34;log&#34;
&#34;math&#34;
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&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
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)
const (
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screenWidth = 320
screenHeight = 240
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)
var (
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hueInt = 0
saturationInt = 128
valueInt = 128
gophersImage *ebiten.Image
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)
func clamp(v, min, max int) int {
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if min &gt; max {
panic(&#34;min must &lt;= max&#34;)
}
if v &lt; min {
return min
}
if max &lt; v {
return max
}
return v
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}
func update(screen *ebiten.Image) error {
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if ebiten.IsKeyPressed(ebiten.KeyQ) {
hueInt--
}
if ebiten.IsKeyPressed(ebiten.KeyW) {
hueInt&#43;&#43;
}
if ebiten.IsKeyPressed(ebiten.KeyA) {
saturationInt--
}
if ebiten.IsKeyPressed(ebiten.KeyS) {
saturationInt&#43;&#43;
}
if ebiten.IsKeyPressed(ebiten.KeyZ) {
valueInt--
}
if ebiten.IsKeyPressed(ebiten.KeyX) {
valueInt&#43;&#43;
}
hueInt = clamp(hueInt, -256, 256)
saturationInt = clamp(saturationInt, 0, 256)
valueInt = clamp(valueInt, 0, 256)
w, h := gophersImage.Size()
op := &amp;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]
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Saturation: %0.2f [A][S]
Value: %0.2f [Z][X]`, hue, saturation, value)
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if err := ebitenutil.DebugPrint(screen, msg); err != nil {
return err
}
return nil
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}
func main() {
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var err error
gophersImage, _, err = ebitenutil.NewImageFromFile(&#34;_resources/images/gophers.jpg&#34;, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, &#34;HSV (Ebiten Demo)&#34;); err != nil {
log.Fatal(err)
}
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}
</code></pre>
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</div></main>
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<p>© 2013 Hajime Hoshi</p>
<p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">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>
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