android - Using method -canvas.drawBitmap(bitmap, src, dst, paint)

Question

Everytime I use this code nothing is drawn. I need to draw a bitmap inside of a specified rectangle.

canvas.drawBitmap(MyBitmap, null, rectangle, null)

I've looked online but can't find much help.

Answer 1

EDIT

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The original answer is incorrect. You can use the sourceRect to specify a part of a Bitmap to draw. It may be null, in which case the whole image will be used.

As per the fryer comment he was drawing beneath something, I'll add a note on that.

drawBitmap(bitmap, srcRect, destRect, paint) does not handle Z ordering (depth) and the order of calling draw on object matters.

If you have 3 shapes to be drawn, square, triangle and circle. If you want the square to be on top then it must be drawn last.

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You're not specified any source, so its not drawn anything.

Example:

You have a Bitmap 100x100 pixels. You want to draw the whole Bitmap.

canvas.drawBitmap(MyBitmap, new Rect(0,0,100,100), rectangle, null);

You want to draw only the left half of the bitmap.

canvas.drawBitmap(MyBitmap, new Rect(0,0,50,100), rectangle, null);

You need to specify the source rect, the source rect can be a rectangle anywhere from 0,0 to the width,height of the bitmap.