Freehand Image Crop draw inside bitmap region

Question

Trying to achieve freehand cropping of an image, so I'm able to draw on the image. But it goes outside bitmap region. I just wanna restrict that user can only draw inside bitmap region, check below screen shot.

I am trying to implement functionality like Photoshop lasso tool.

Its drawing outside view region, which generates incorrect output.

Output

Code@

onDraw

public void onDraw(Canvas canvas) {

        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        canvas.drawBitmap(bitmap, rect, rect, null);
        // RectF r = new RectF();
        // Matrix matrix = new Matrix();
        // matrix.mapRect(r);
        // Log.i(TAG, "Rect " + r.left + " " + r.top + " " + r.right + " " +
        // r.bottom + " ");
        // canvas.clipRect(r.left, r.top, r.right, r.bottom);

        Path path = new Path();
        boolean first = true;

        for (int i = 0; i < points.size(); i += 2) {
            Point point = points.get(i);
            if (first) {
                first = false;
                path.moveTo(point.x, point.y);
            } else if (i < points.size() - 1) {
                Point next = points.get(i + 1);
                path.quadTo(point.x, point.y, next.x, next.y);
            } else {
                mlastpoint = points.get(i);
                path.lineTo(point.x, point.y);
            }
        }
        canvas.drawPath(path, paint);
    }

onCrop

Bitmap resultingImage = Bitmap.createBitmap(widthOfscreen,heightOfScreen, bitmap1.getConfig());

        Canvas canvas = new Canvas(resultingImage);

        Paint paint = new Paint();
        paint.setAntiAlias(true);
        Path path = new Path();
        for (int i = 0; i < SomeView.points.size(); i++) {
            path.lineTo(SomeView.points.get(i).x, SomeView.points.get(i).y);
        }
        // path.lineTo(150, 0);
        // path.lineTo(230, 120);
        // path.lineTo(70, 120);
        // path.lineTo(150, 0);

        canvas.drawPath(path, paint);
        if(crop){
            paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

        }else{
            paint.setXfermode(new PorterDuffXfermode(Mode.SRC_OUT));
        }

suggest me to achieve my goal.

Answer 1

late answer but use full for other u can override onmeasure method and set your image bitmap width and height in that method and resize your canvas so now you can draw only in your canvas.so your image come center.it for drawpath only on your bitmap.

 @Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    height = bitmap.getHeight();
    width = bitmap.getWidth();

    setMeasuredDimension(width,height);
}

and then change in your oncrop method so you can slove it esaly.

Bitmap resultingImage = Bitmap.createBitmap(yourbitmap.getwidth(),yourbitmap.getheight(), yourbitmap.getConfig());