poly to mono alphabet for every 2nd line

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math::polygon::clip

Math::Polygon::Clip(3pm)				User Contributed Perl Documentation				  Math::Polygon::Clip(3pm)

NAME

       Math::Polygon::Clip - frame a polygon in a square

INHERITANCE

	Math::Polygon::Clip
	  is a Exporter

SYNOPSIS

	my @poly  = ( [1,2], [2,4], [5,7], [1, 2] );
	my @box   = ( $xmin, $ymin, $xmax, $ymax );

	my $boxed = polygon_clip @box, @poly;

DESCRIPTION

       Cut-off all parts of the polygon which are outside the box

FUNCTIONS

       polygon_fill_clip1(ARRAY-BOX, LIST-OF-POINTS)
	   Clipping a polygon into rectangles can be done in various ways.  With this algorithm (which I designed myself, but may not be new), the
	   parts of the polygon which are outside the BOX are mapped on the borders.  The polygon stays in one piece.

	   Returned is one list of points, which is cleaned from double points, spikes and superfluous intermediate points.

       polygon_fill_clip2(ARRAY-BOX, LIST-OF-POINTS)
	   To be implemented.  The polygon falls apart in fragments, which are not connected: paths which are followed in two directions are
	   removed.  This is required by some applications, like polygons used in geographical context (country contours and such).

       polygon_fill_clip3(ARRAY-BOX, OUT-POLY, [IN-POLYS])
	   To be implemented.  A surrounding polygon, with possible inclussions.

       polygon_line_clip(ARRAY-BOX, LIST-OF-POINTS)
	   Returned is a list of ARRAYS (possibly 0 long) containing line pieces from the input polygon (or line).

	   example:

	    my @points = ( [1,2], [2,3], [2,0], [1,-1], [1,2] );
	    my @bbox   = ( 0, -2, 2, 2 );
	    my @l      = polygon_line_clip @bbox, @points;
	    print scalar @l;	  # 1, only one piece found
	    my @first = @{$l[0]}; # first is [2,0], [1,-1], [1,2]

SEE ALSO

       This module is part of Math-Polygon distribution version 1.02, built on September 19, 2011. Website: http://perl.overmeer.net/geo/

LICENSE

       Copyrights 2004,2006-2011 by Mark Overmeer. For other contributors see ChangeLog.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  See
       http://www.perl.com/perl/misc/Artistic.html

perl v5.12.4							    2011-09-19						  Math::Polygon::Clip(3pm)

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