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<!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" >
< meta name = "description" content = "Ebiten example - hsv" >
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< 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/highlight-github.css" >
< 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" >
< li class = "nav-item" > < a class = "nav-link" href = "https://github.com/hajimehoshi/ebiten" > GitHub< / a > < / li >
< li class = "nav-item" > < a class = "nav-link" href = "https://godoc.org/github.com/hajimehoshi/ebiten" > GoDoc< / a > < / li >
< 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 >
< / 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"
_ " image/jpeg"
" log"
" math"
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" github.com/hajimehoshi/ebiten"
" github.com/hajimehoshi/ebiten/ebitenutil"
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)
const (
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screenWidth = 320
screenHeight = 240
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)
var (
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hue128 = 0
saturation128 = 128
value128 = 128
inverted = false
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prevPressedI = false
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 {
panic(" min must < = max" )
}
if v < min {
return min
}
if max < v {
return max
}
return v
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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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}
if ebiten.IsKeyPressed(ebiten.KeyW) {
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hue128+ +
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}
if ebiten.IsKeyPressed(ebiten.KeyA) {
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saturation128--
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}
if ebiten.IsKeyPressed(ebiten.KeyS) {
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saturation128+ +
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}
if ebiten.IsKeyPressed(ebiten.KeyZ) {
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value128--
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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)
saturation128 = clamp(saturation128, 0, 256)
value128 = clamp(value128, 0, 256)
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pressedI := ebiten.IsKeyPressed(ebiten.KeyI)
if pressedI & & !prevPressedI {
inverted = !inverted
}
prevPressedI = pressedI
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if ebiten.IsRunningSlowly() {
return nil
}
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// Center the image on the screen.
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w, h := gophersImage.Size()
op := & ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2)
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// Change HSV.
hue := float64(hue128) * 2 * math.Pi / 128
saturation := float64(saturation128) / 128
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 {
op.ColorM.Scale(-1, -1, -1, 1)
op.ColorM.Translate(1, 1, 1, 0)
}
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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"
if inverted {
msgInverted = " true"
}
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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]
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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}
func main() {
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var err error
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gophersImage, _, err = ebitenutil.NewImageFromFile(" _resources/images/gophers.jpg" , ebiten.FilterDefault)
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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)
}
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}
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< / code > < / pre > < / div >
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< / div > < / main >
< footer > < div class = "container" >
< 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 >
< / div > < / footer >
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< script src = "../scripts/highlight.pack.js" > < / script >
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< script > hljs . initHighlightingOnLoad ( ) ; < / script >
