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| public class EraseView extends View {
private boolean isMove = false;
private Bitmap bitmap = null;
private Bitmap frontBitmap = null;
private Path path;
private Canvas mCanvas;
private Paint paint;
public EraseView(Context context) {
this(context, null);
}
public EraseView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public EraseView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mCanvas == null) {
createEraseBitmap();
}
canvas.drawBitmap(bitmap, 0, 0, null);
mCanvas.drawPath(path, paint);
}
public void createEraseBitmap() {
bitmap = Bitmap.createBitmap(getWidth(), getHeight(), Config.ARGB_4444);
frontBitmap = createBitmap(Color.GRAY, getWidth(), getHeight());
paint = new Paint();
paint.setStyle(Paint.Style.STROKE);
paint.setXfermode(new PorterDuffXfermode(Mode.CLEAR));
paint.setAntiAlias(true);
paint.setDither(true);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setStrokeWidth(60);
path = new Path();
mCanvas = new Canvas(bitmap);
mCanvas.drawBitmap(frontBitmap, 0, 0, null);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float ax = event.getX();
float ay = event.getY();
if (event.getAction() == MotionEvent.ACTION_DOWN) {
isMove = false;
path.reset();
path.moveTo(ax, ay);
invalidate();
return true;
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
isMove = true;
path.lineTo(ax, ay);
invalidate();
return true;
}
return super.onTouchEvent(event);
}
public Bitmap createBitmap(int color, int width, int height) {
int[] rgb = new int[width * height];
for (int i = 0; i < rgb.length; i++) {
rgb[i] = color;
}
return Bitmap.createBitmap(rgb, width, height, Config.ARGB_8888);
}
}
|
