Arguments: position1 position2
Returns position1 after modifying it to be (position- position1 position2). This is the destructive version of position-position-, which returns a new position object.
The returned position has x value
(- (position-x position1) (position-x position2))
and y value
(- (position-y position1) (position-y position2)).
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
The documentation is described in introduction.htm and the index is in index.htm.
Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.