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<!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 >
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< 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 >
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< main > < div class = "container" >
< h1 > Ebiten example - hsv< / h1 >
< iframe src = "hsv.content.html" width = "640" height = "480" > < / iframe >
< pre > < code > // + build example
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package main
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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
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gophersImage, _, err = ebitenutil.NewImageFromFile(" _resources/images/gophers.jpg" , ebiten.FilterNearest)
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if err != nil {
log.Fatal(err)
}
if err := ebiten.Run(update, screenWidth, screenHeight, 2, " HSV (Ebiten Demo)" ); err != nil {
log.Fatal(err)
}
}
< / code > < / pre >
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< / 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 >
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