ebiten/_docs/public/examples/hsv.html
2016-08-27 02:28:57 +09:00

120 lines
3.1 KiB
HTML

<!DOCTYPE html>
<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/ebiten.css">
<header class="navbar"><div class="container">
<div class="navbar-header">
<a class="navbar-brand" href="/">Ebiten</a>
</div>
</header>
<main><div class="container">
<h1>Ebiten example - hsv</h1>
<iframe src="hsv.content.html" width="640" height="480"></iframe>
<pre><code>// &#43;build example
package main
import (
&#34;fmt&#34;
_ &#34;image/jpeg&#34;
&#34;log&#34;
&#34;math&#34;
&#34;github.com/hajimehoshi/ebiten&#34;
&#34;github.com/hajimehoshi/ebiten/ebitenutil&#34;
)
const (
screenWidth = 320
screenHeight = 240
)
var (
hueInt = 0
saturationInt = 128
valueInt = 128
gophersImage *ebiten.Image
)
func clamp(v, min, max int) int {
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
}
func update(screen *ebiten.Image) error {
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]
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(&#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)
}
}
</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">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>