NAME

Algorithm::Line::Bresenham - simple pixellated line-drawing algorithm

SYNOPSIS

use Algorithm::Line::Bresenham qw/line/;
my @points = line(3,3 => 5,0);
   # returns the list: [3,3], [4,2], [4,1], [5,0]
line(3,3 => 5,0,  \&draw_line);
   # calls draw_line on each point in turn

DESCRIPTION

Bresenham is one of the canonical line drawing algorithms for pixellated grids. Given a start and an end-point, Bresenham calculates which points on the grid need to be filled to generate the line between them.

Googling for 'Bresenham', and 'line drawing algorithms' gives some good overview. The code here takes its starting point from Mark Feldman's Pascal code in his article Bresenham's Line and Circle Algorithms at http://www.gamedev.net/reference/articles/article767.asp.

FUNCTIONS

line

line ($from_y, $from_x => $to_y, $to_x);

Generates a list of all the intermediate points. This is returned as a list of array references.

line ($from_y, $from_x => $to_y, $to_x,  \&callback);

Calls the referenced function on each point in turn. The callback could be used to actually draw the point. Returns the collated return values from the callback.

TODO and BUGS

Implement Circle algorithm

AUTHOR and LICENSE

osfameron, osfameron@cpan.org

Copyright (c) 2004. osfameron. All rights reserved.

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