http://www.vb-helper.com/HowTo/dragpic2.zip

	Purpose
Overlay a picture on another and allow the user to drag it using BitBlt.

	Method
Create a mask that is black where the overlaid picture should show and white
where the background should show. Copy the mask using BitBlt with opcode
MERGEPAINT. Then copy the overlay image with opcode SRCAND.

The book Visual Basic Graphics Programming has more information on this kind
of graphic manipulation. See www.vb-helper.com/vbgp.htm.

The file http://www.vb-helper.com/HowTo/dragpic2.zip performs the same 
operation using PaintPicture instead of BitBlt. This version was created
because BitBlt is roughly 10 times faster than PaintPicture. Note that it is
still fairly slow for the purpose of dragging an image around.

	Disclaimer
This example program is provided "as is" with no warranty of any kind. It is
intended for demonstration purposes only. In particular, it does not error
handling. You can use the example in any form, but please mention
www.vb-helper.com.