FunctionPackage: cgToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 9.0
Unrevised from 8.2 to 9.0.
8.2 version

box-intersect

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) 1998-2012, Franz Inc. Oakland, CA., USA. All rights reserved.
Documentation for Allegro CL version 9.0. This page was not revised from the 8.2 page.
Created 2012.5.30.

ToCDocOverviewCGDocRelNotesFAQIndexPermutedIndex
Allegro CL version 9.0
Unrevised from 8.2 to 9.0.
8.2 version