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examples/paint: Use touch events
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parent
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commit
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@ -36,29 +36,48 @@ var (
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canvasImage *ebiten.Image
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)
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func update(screen *ebiten.Image) error {
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if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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count++
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func paint(screen *ebiten.Image, x, y int) error {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(x), float64(y))
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op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
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theta := 2.0 * math.Pi * float64(count%60) / ebiten.FPS
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op.ColorM.RotateHue(theta)
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if err := canvasImage.DrawImage(brushImage, op); err != nil {
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return err
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}
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return nil
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}
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func update(screen *ebiten.Image) error {
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drawn := false
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mx, my := ebiten.CursorPosition()
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if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(mx), float64(my))
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op.ColorM.Scale(1.0, 0.50, 0.125, 1.0)
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theta := 2.0 * math.Pi * float64(count%60) / ebiten.FPS
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op.ColorM.RotateHue(theta)
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if err := canvasImage.DrawImage(brushImage, op); err != nil {
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if err := paint(screen, mx, my); err != nil {
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return err
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}
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drawn = true
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}
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for _, t := range ebiten.Touches() {
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x, y := t.Position()
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if err := paint(screen, x, y); err != nil {
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return err
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}
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drawn = true
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}
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if drawn {
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count++
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}
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if err := screen.DrawImage(canvasImage, nil); err != nil {
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return err
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}
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if err := ebitenutil.DebugPrint(screen, fmt.Sprintf("(%d, %d)", mx, my)); err != nil {
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msg := fmt.Sprintf("(%d, %d)", mx, my)
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for _, t := range ebiten.Touches() {
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x, y := t.Position()
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msg += fmt.Sprintf("\n(%d, %d) touch %d", x, y, t.ID())
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}
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if err := ebitenutil.DebugPrint(screen, msg); err != nil {
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return err
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}
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return nil
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