Crop the selected path region from a custom image

Question

Crop the selected path region from a custom image

I created my own image view to remove the selected part from bitmap images. There is an operation for the selection area to get rid of the current bitmap using path has a collection of points .

Here is the code snippet:

      for (int i = points.size() - 2; i < points.size(); i++) {
                        if (i >= 0) {
                            Point point = points.get(i);

                            if (i == 0) {
                                Point next = points.get(i + 1);
                                point.dx = ((next.x - point.x) / 3);
                                point.dy = ((next.y - point.y) / 3);
                            } else if (i == points.size() - 1) {
                                Point prev = points.get(i - 1);
                                point.dx = ((point.x - prev.x) / 3);
                                point.dy = ((point.y - prev.y) / 3);
                            } else {
                                Point next = points.get(i + 1);
                                Point prev = points.get(i - 1);
                                point.dx = ((next.x - prev.x) / 3);
                                point.dy = ((next.y - prev.y) / 3);
                            }
                        }
                    }
            path.cubicTo(prev.x + prev.dx, prev.y + prev.dy, point.x -  point.dx, 
                                             point.y - point.dy, point.x, point.y);

            paramCanvas.drawPath(path, paint);