=head1 NAME Algorithm::Line::Bresenham - simple pixellated line-drawing algorithm =head1 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] my @points = circle(30,30,5); # returns the points to draw a circle centered at 30,30, radius 5 =head1 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 are adapted from various sources, mainly from C code at https://gist.github.com/bert/1085538 =head1 FUNCTIONS =cut =head2 C line ($from_x, $from_y => $to_x, $to_y); Generates a list of all the intermediate points. This is returned as a list of array references. Previous versions used to include a callback parameter as a CODE ref to act on each point in turn. This version omits that for performance reasons =cut =head2 C my @points = circle ($x, $y, $radius) Returns the points to draw a circle centered on C<$x,$y> with radius C<$radius> =cut =head2 C my @points = ellipse_rect ($x0, $y0, $x1, $y1) Returns the points to an ellipse bound within a rectangle defined by the two coordinate pairs passed. =cut =head2 C my @points = basic_bezier ($x0, $y0, $x1, $y1, $x2, $y2) This is not usefull on its own. Iteturns the points to segment of a bezier curve without a gradient sign change. It is a companion to the C function that splits a bezier into segments with each gradient direction and these segments are computed in C =cut =head2 C my @points = quad_bezier ($x0, $y0, $x1, $y1, $x2, $y2) Draws a Bezier curve from C<($x0,$y0)> to C<($x2,$y2)> using control point C<($x1,$y1)> =cut =head2 C my @points = polyline ($x0, $y0, $x1, $y1, $x2, $y2) Draws a polyline between points served as a list of x,y pairs =cut =head1 TODO and BUGS polylines nurbs arc line width fills pattern fills =head1 THANKS Patches for the circle algorithm and a float value bug contributed by Richard Clamp, thanks! =head1 AUTHOR osfameron, osfameron@cpan.org saiftynet =head1 LICENSE Artistic (Perl) =head1 INSTALLATION Using C: $ cpan Algorithm::Line::Bresenham Manual install: $ perl Makefile.PL $ make $ make install Copyright (c) 2004-2022 saiftynet, 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 =cut