when performing a copy/move rectangle plot, the underlying graphics system requires coordinates that stay within screen bounds, otherwise it will crash. this change ensures that is the case
the way in which source/destination coordinates are handled has also been changed to ensure they will work correctly in the event that negative coordinates had been used
when performing a copy/move rectangle plot, the underlying graphics system requires coordinates that stay within screen bounds, otherwise it will crash. this change ensures that is the case
the way in which source/destination coordinates are handled has also been changed to ensure they will work correctly in the event that negative coordinates had been used
fixes #227