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examples/paint: Use touch events

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This commit is contained in:
Hajime Hoshi 2016-05-27 01:51:13 +09:00
parent e84f798c7c
commit ba186d9fa4
1 changed files with 30 additions and 11 deletions
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41
examples/paint/main.go
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@ -36,29 +36,48 @@ var (
canvasImage *ebiten.Image canvasImage *ebiten.Image
) )
func update(screen *ebiten.Image) error { func paint(screen *ebiten.Image, x, y int) error {
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) { op := &ebiten.DrawImageOptions{}
count++ op.GeoM.Translate(float64(x), float64(y))
op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
theta := 2.0 * math.Pi * float64(count%60) / ebiten.FPS
op.ColorM.RotateHue(theta)
if err := canvasImage.DrawImage(brushImage, op); err != nil {
return err
} }
return nil
}
func update(screen *ebiten.Image) error {
drawn := false
mx, my := ebiten.CursorPosition() mx, my := ebiten.CursorPosition()
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) { if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
op := &ebiten.DrawImageOptions{} if err := paint(screen, mx, my); err != nil {
op.GeoM.Translate(float64(mx), float64(my))
op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
theta := 2.0 * math.Pi * float64(count%60) / ebiten.FPS
op.ColorM.RotateHue(theta)
if err := canvasImage.DrawImage(brushImage, op); err != nil {
return err return err
} }
drawn = true
}
for _, t := range ebiten.Touches() {
x, y := t.Position()
if err := paint(screen, x, y); err != nil {
return err
}
drawn = true
}
if drawn {
count++
} }
if err := screen.DrawImage(canvasImage, nil); err != nil { if err := screen.DrawImage(canvasImage, nil); err != nil {
return err return err
} }
if err := ebitenutil.DebugPrint(screen, fmt.Sprintf("(%d, %d)", mx, my)); err != nil { msg := fmt.Sprintf("(%d, %d)", mx, my)
for _, t := range ebiten.Touches() {
x, y := t.Position()
msg += fmt.Sprintf("\n(%d, %d) touch %d", x, y, t.ID())
}
if err := ebitenutil.DebugPrint(screen, msg); err != nil {
return err return err
} }
return nil return nil