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doc: Update examples/hsv

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This commit is contained in:
Hajime Hoshi 2017-08-21 01:58:34 +09:00
parent a6516d1c9d
commit 71117073d0
1 changed files with 23 additions and 2 deletions
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25
docs/examples/hsv.html
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@ -49,7 +49,10 @@ var (
hueInt = 0 hueInt = 0
saturationInt = 128 saturationInt = 128
valueInt = 128 valueInt = 128
gophersImage *ebiten.Image inverted = false
prevPressedI = false
gophersImage *ebiten.Image
) )
func clamp(v, min, max int) int { func clamp(v, min, max int) int {
@ -84,6 +87,13 @@ func update(screen *ebiten.Image) error {
if ebiten.IsKeyPressed(ebiten.KeyX) { if ebiten.IsKeyPressed(ebiten.KeyX) {
valueInt++ valueInt++
} }
pressedI := ebiten.IsKeyPressed(ebiten.KeyI)
if pressedI && !prevPressedI {
inverted = !inverted
}
prevPressedI = pressedI
if ebiten.IsRunningSlowly() { if ebiten.IsRunningSlowly() {
return nil return nil
} }
@ -94,15 +104,26 @@ func update(screen *ebiten.Image) error {
w, h := gophersImage.Size() w, h := gophersImage.Size()
op := &ebiten.DrawImageOptions{} op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2) op.GeoM.Translate(float64(screenWidth-w)/2, float64(screenHeight-h)/2)
hue := float64(hueInt) * 2 * math.Pi / 128 hue := float64(hueInt) * 2 * math.Pi / 128
saturation := float64(saturationInt) / 128 saturation := float64(saturationInt) / 128
value := float64(valueInt) / 128 value := float64(valueInt) / 128
op.ColorM.ChangeHSV(hue, saturation, value) op.ColorM.ChangeHSV(hue, saturation, value)
if inverted {
op.ColorM.Scale(-1, -1, -1, 1)
op.ColorM.Translate(1, 1, 1, 0)
}
screen.DrawImage(gophersImage, op) screen.DrawImage(gophersImage, op)
msgInverted := "false"
if inverted {
msgInverted = "true"
}
msg := fmt.Sprintf(`Hue: %0.2f [Q][W] msg := fmt.Sprintf(`Hue: %0.2f [Q][W]
Saturation: %0.2f [A][S] Saturation: %0.2f [A][S]
Value: %0.2f [Z][X]`, hue, saturation, value) Value: %0.2f [Z][X]
Inverted: %s [I]`, hue, saturation, value, msgInverted)
ebitenutil.DebugPrint(screen, msg) ebitenutil.DebugPrint(screen, msg)
return nil return nil
} }