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# Copyright 2014 Kevin Ryde
# This file is part of Math-PlanePath.
#
# Math-PlanePath is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3, or (at your option) any later
# version.
#
# Math-PlanePath is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with Math-PlanePath. If not, see <http://www.gnu.org/licenses/>.
package Math::PlanePath::Base::NSEW;
use 5.004;
use strict;
use vars '$VERSION';
$VERSION = 117;
use constant dx_minimum => -1; # NSEW straight only
use constant dx_maximum => 1;
use constant dy_minimum => -1;
use constant dy_maximum => 1;
use constant dsumxy_minimum => -1; # NSEW straight only
use constant dsumxy_maximum => 1;
use constant ddiffxy_minimum => -1;
use constant ddiffxy_maximum => 1;
use constant dir_maximum_dxdy => (0,-1); # South
use constant _UNDOCUMENTED__dxdy_list => (1,0, # E
0,1, # N
-1,0, # W
0,-1); # S
1;
__END__
=for stopwords Ryde Math-PlanePath multi-inheritance mixin
=head1 NAME
Math::PlanePath::Base::NSEW -- multi-inheritance mixin for North, South, East, West unit steps
=head1 SYNOPSIS
=for test_synopsis my @ISA; # normally a package variable of course, but this satisfies Test::Synopsis
package Math::PlanePath::Foo;
use Math::PlanePath;
use Math::PlanePath::Base::NSEW;
@ISA = ('Math::PlanePath::Base::NSEW', 'Math::PlanePath');
=head1 DESCRIPTION
This is a multi-inheritance mixin for paths which take only steps North,
South, East and West by distance 1 each time. This includes for example the
C<SquareSpiral> and also things like the C<DragonCurve> or C<CCurve>.
The following path descriptive methods are provided
value
dx_minimum() -1
dx_maximum() 1
dy_minimum() -1
dy_maximum() 1
dsumxy_minimum() -1
dsumxy_maximum() 1
ddiffxy_minimum() -1
ddiffxy_maximum() 1
dir_maximum_dxdy() 0,-1 # maximum South
=cut
# _UNDOCUMENTED__dxdy_list() 1,0, 0,1, -1,0, 0,-1
=pod
=head1 SEE ALSO
L<Math::PlanePath>,
L<Math::PlanePath::Base::Generic>
=head1 HOME PAGE
L<http://user42.tuxfamily.org/math-planepath/index.html>
=head1 LICENSE
Copyright 2014 Kevin Ryde
This file is part of Math-PlanePath.
Math-PlanePath is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
Math-PlanePath is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
Math-PlanePath. If not, see <http://www.gnu.org/licenses/>.
=cut
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