| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |
Arguments: box1 box2 &optional box-to-return
Returns the box which is the intersection of the arguments, or nil
if they do not intersect. If
box-to-return is specified and non-nil
, it must be a box object (see make-box). If that case,
box-to-return will be modified to be the
intersection, if box-intersect returns non-nil
. (This will save space by avoiding the creation
of a new box object.) If box-to-return is
unspecified or specified nil
, a new box is
created if the arguments intersect.
Boxes which touch just on their edges or at the vertices are not considered to intersect. Thus,
(make-box 10 10 20 20)
does not intersect
(make-box 20 20 30 30)
but does intersect
(make-box 19 19 30 30)
See the description of the box
class for general information on boxes.
Copyright (c) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.1 page.
Created 2010.1.21.
| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |