

 
Manual Reference Pages  MATH::GEOMETRY::PLANAR::OFFSET (3)
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NAME
Math::Geometry::Planar::Offset  Calculate offset polygons
CONTENTS
SYNOPSIS
use Math::Geometry::Planar::Offset;
my (@results) = OffsetPolygon(\@points, $distance);
foreach my $polygon (@results) {
# do something with @$polygon
}
AUTHOR
Eric Wilhelm @ <ewilhelm at cpan dot org>
COPYRIGHT NOTICE
Copyright (C) 20032007 Eric L. Wilhelm. All rights reserved.
NO WARRANTY
Absolutely, positively NO WARRANTY, neither express or implied, is
offered with this software. You use this software at your own risk. In
case of loss, neither Eric Wilhelm, nor anyone else, owes you anything
whatseover. You have been warned.
Note that this includes NO GUARANTEE of MATHEMATICAL CORRECTNESS. If
you are going to use this code in a production environment, it is YOUR
RESPONSIBILITY to verify that the methods return the correct values.
LICENSE
You may use this software under one of the following licenses:
(1) GNU General Public License
(found at http://www.gnu.org/copyleft/gpl.html)
(2) Artistic License
(found at http://www.perl.com/pub/language/misc/Artistic.html)
BUGS
There are currently some problems with concurrent edge events on outward
(and maybe inward) offsets. Some significant changes need to be made.
METHODS
These methods are actually defined in Math::Geometry::Planar, which uses
this module.
offset_polygon
Returns reference to an array of polygons representing the original polygon
offsetted by $distance
$polygon>offset_polygon($distance);
Functions
Only OffsetPolygon is exported.
pi
Returns the constant pi
OffsetPolygon
Make offset polygon subroutine.
Call with offset distance and ref to array of points for original
polygon polygon input must be prewrapped so point[n]=point[0]
Will return a list of polygons (as refs.) The number of polygons in the
output depends on the shape of your input polygon. It may split into
several pieces during the offset.
my (@results) = OffsetPolygon(\@points, $distance);
foreach my $polygon (@results) {
# do something with @$polygon
}
perl v5.20.3  MATH::GEOMETRY::PLANAR::OFFSET (3)  20160317 
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