2016-04-13 18:26:31 +02:00
<!DOCTYPE html>
2017-08-18 16:26:17 +02:00
< meta charset = "utf-8" >
2017-08-18 16:43:08 +02:00
< meta property = "og:image" itemprop = "image primaryImageOfPage" content = "https://hajimehoshi.github.io/ebiten/images/examples/hsv.png" >
< meta name = "description" content = "Ebiten example - hsv" >
2016-04-13 18:26:31 +02:00
< link rel = "shortcut icon" href = "../favicon.png" type = "image/png" >
< link rel = "icon" href = "../favicon.png" type = "image/png" >
< title > Ebiten example - hsv< / title >
2017-08-18 16:26:17 +02:00
2016-08-27 17:48:15 +02:00
< link rel = "stylesheet" href = "../stylesheets/bootstrap.min.css" >
< link rel = "stylesheet" href = "../stylesheets/highlight-github.css" >
< link rel = "stylesheet" href = "../stylesheets/ebiten.css" >
2016-09-02 18:55:07 +02:00
< script src = "../scripts/googleanalytics.js" > < / script >
2016-08-26 19:28:57 +02:00
2017-08-17 20:00:05 +02:00
< nav class = "navbar" > < div class = "container" >
2017-08-17 18:22:19 +02:00
< nav class = "d-flex flex-row" style = "width: 100%;" >
2017-08-17 20:00:05 +02:00
< div class = "nav mr-auto" > < a class = "navbar-brand" href = "../" > < img src = "../images/logo_white.svg" alt = "EBITEN" > < / a > < / div >
2017-08-17 18:22:19 +02:00
< 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 >
2017-11-09 18:07:16 +01:00
< li class = "nav-item" > < a class = "nav-link" href = "https://ebiten-playground.github.io/" > Playground< / a >
2016-08-26 19:37:08 +02:00
< / ul >
< / nav >
2017-08-17 20:00:05 +02:00
< / div > < / nav >
2016-04-13 18:26:31 +02:00
2016-08-26 19:28:57 +02:00
< main > < div class = "container" >
2016-08-26 20:18:16 +02:00
< h2 > Ebiten example - hsv< / h2 >
2016-08-26 19:28:57 +02:00
< iframe src = "hsv.content.html" width = "640" height = "480" > < / iframe >
2018-03-21 06:34:48 +01:00
< div class = "card" > < pre class = "card-body" > < code class = "language-go" > // + build example jsgo
2016-08-26 16:33:36 +02:00
package main
2016-04-13 18:26:31 +02:00
import (
2018-03-21 06:34:48 +01:00
" bytes"
2016-08-26 22:36:52 +02:00
" fmt"
2018-03-21 06:34:48 +01:00
" image"
2016-08-26 22:36:52 +02:00
_ " image/jpeg"
" log"
" math"
2016-04-13 18:26:31 +02:00
2016-08-26 22:36:52 +02:00
" github.com/hajimehoshi/ebiten"
" github.com/hajimehoshi/ebiten/ebitenutil"
2018-03-21 06:34:48 +01:00
" github.com/hajimehoshi/ebiten/examples/resources/images"
2016-04-13 18:26:31 +02:00
)
const (
2016-08-26 22:36:52 +02:00
screenWidth = 320
screenHeight = 240
2016-04-13 18:26:31 +02:00
)
var (
2018-01-29 15:39:30 +01:00
hue128 = 0
saturation128 = 128
value128 = 128
inverted = false
2017-08-20 18:58:34 +02:00
prevPressedI = false
gophersImage *ebiten.Image
2016-04-13 18:26:31 +02:00
)
2018-01-29 15:39:30 +01:00
// clamp clamps v to the range [min, max].
2016-04-13 18:26:31 +02:00
func clamp(v, min, max int) int {
2016-08-26 22:36:52 +02:00
if min > max {
panic(" min must < = max" )
}
if v < min {
return min
}
if max < v {
return max
}
return v
2016-04-13 18:26:31 +02:00
}
func update(screen *ebiten.Image) error {
2018-01-29 15:39:30 +01:00
// Adjust HSV values along with the user' s input.
2016-08-26 22:36:52 +02:00
if ebiten.IsKeyPressed(ebiten.KeyQ) {
2018-01-29 15:39:30 +01:00
hue128--
2016-08-26 22:36:52 +02:00
}
if ebiten.IsKeyPressed(ebiten.KeyW) {
2018-01-29 15:39:30 +01:00
hue128+ +
2016-08-26 22:36:52 +02:00
}
if ebiten.IsKeyPressed(ebiten.KeyA) {
2018-01-29 15:39:30 +01:00
saturation128--
2016-08-26 22:36:52 +02:00
}
if ebiten.IsKeyPressed(ebiten.KeyS) {
2018-01-29 15:39:30 +01:00
saturation128+ +
2016-08-26 22:36:52 +02:00
}
if ebiten.IsKeyPressed(ebiten.KeyZ) {
2018-01-29 15:39:30 +01:00
value128--
2016-08-26 22:36:52 +02:00
}
if ebiten.IsKeyPressed(ebiten.KeyX) {
2018-01-29 15:39:30 +01:00
value128+ +
2016-08-26 22:36:52 +02:00
}
2017-08-20 18:58:34 +02:00
2018-01-29 15:39:30 +01:00
hue128 = clamp(hue128, -256, 256)
saturation128 = clamp(saturation128, 0, 256)
value128 = clamp(value128, 0, 256)
2017-08-20 18:58:34 +02:00
pressedI := ebiten.IsKeyPressed(ebiten.KeyI)
if pressedI & & !prevPressedI {
inverted = !inverted
}
prevPressedI = pressedI
2017-05-16 03:38:34 +02:00
if ebiten.IsRunningSlowly() {
return nil
}
2016-08-26 22:36:52 +02:00
2018-01-29 15:39:30 +01:00
// Center the image on the screen.
2016-08-26 22:36:52 +02:00
w, h := gophersImage.Size()
op := & ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2)
2017-08-20 18:58:34 +02:00
2018-01-29 15:39:30 +01:00
// Change HSV.
hue := float64(hue128) * 2 * math.Pi / 128
saturation := float64(saturation128) / 128
value := float64(value128) / 128
2016-08-26 22:36:52 +02:00
op.ColorM.ChangeHSV(hue, saturation, value)
2018-01-29 15:39:30 +01:00
// Invert the color.
2017-08-20 18:58:34 +02:00
if inverted {
op.ColorM.Scale(-1, -1, -1, 1)
op.ColorM.Translate(1, 1, 1, 0)
}
2017-03-04 15:27:25 +01:00
screen.DrawImage(gophersImage, op)
2016-08-26 22:36:52 +02:00
2018-01-29 15:39:30 +01:00
// Draw the text of the current status.
2017-08-20 18:58:34 +02:00
msgInverted := " false"
if inverted {
msgInverted = " true"
}
2016-08-26 22:36:52 +02:00
msg := fmt.Sprintf(`Hue: %0.2f [Q][W]
2016-04-13 18:26:31 +02:00
Saturation: %0.2f [A][S]
2017-08-20 18:58:34 +02:00
Value: %0.2f [Z][X]
Inverted: %s [I]`, hue, saturation, value, msgInverted)
2017-03-04 15:27:25 +01:00
ebitenutil.DebugPrint(screen, msg)
2016-08-26 22:36:52 +02:00
return nil
2016-04-13 18:26:31 +02:00
}
func main() {
2018-03-21 06:34:48 +01:00
// Decode image from a byte slice instead of a file so that
// this example works in any working directory.
// If you want to use a file, there are some options:
// 1) Use os.Open and pass the file to the image decoder.
// This is a very regular way, but doesn' t work on browsers.
// 2) Use ebitenutil.OpenFile and pass the file to the image decoder.
// This works even on browsers.
// 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file.
// This also works on browsers.
img, _, err := image.Decode(bytes.NewReader(images.Gophers_jpg))
2016-08-26 22:36:52 +02:00
if err != nil {
log.Fatal(err)
}
2018-03-21 06:34:48 +01:00
gophersImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
2016-08-26 22:36:52 +02:00
if err := ebiten.Run(update, screenWidth, screenHeight, 2, " HSV (Ebiten Demo)" ); err != nil {
log.Fatal(err)
}
2016-04-13 18:26:31 +02:00
}
2017-08-18 16:26:17 +02:00
< / code > < / pre > < / div >
2016-04-13 18:26:31 +02:00
2016-08-26 19:28:57 +02:00
< / div > < / main >
< footer > < div class = "container" >
< p > © 2013 Hajime Hoshi< / p >
2016-08-28 00:10:41 +02:00
< p > Code is licensed under < a href = "https://github.com/hajimehoshi/ebiten/blob/master/LICENSE" > the Apache License 2.0< / a > .< / p >
2016-08-26 19:28:57 +02:00
< 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 >
2016-04-13 18:26:31 +02:00
2016-08-27 17:48:15 +02:00
< script src = "../scripts/highlight.pack.js" > < / script >
2016-08-27 07:00:06 +02:00
< script > hljs . initHighlightingOnLoad ( ) ; < / script >
