Android clip canvas.drawBitmap

Question

I am new to Android and I have two images one is an empty image and the other is a full image to represent a progress bar.

How can I only draw a percentage of the full image using canvas.drawBitmap?

I would prefer not to resize the bitmap image each time.

Answer 1

you can use 2 Rects, the source Rect and the destination Rect to only draw a piece

//example
bitmap = BitmapFactory.decodeResource(getResources(),
                    R.drawable.backbutton);

Rect source = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
Rect bitmapRect = new Rect(0, 0, canvasWidth -200,50);
canvas.drawBitmap(bitmap, source, bitmapRect, null);

a Rect is a rectangle like this

new Rect(topleftx,toplefty,bottomrightx,bottomrighty);