nposition-

Arguments: position1 position2

Returns position1 after modifying it to be (position- position1 position2). This is the destructive version of 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)).

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Created 2015.5.21.