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|
package Color::Spectrum::Multi;
use warnings;
use strict;
use base qw(Color::Spectrum);
=head1 NAME
Color::Spectrum::Multi - simple L<Color::Spectrum> wrapper to handle fading
between multiple colours.
=head1 VERSION
Version 0.02
=cut
our $VERSION = '0.02';
=head1 SYNOPSIS
A simple wrapper around L<Color::Spectrum>, to allow generating a range of colours
fading between multiple colours (e.g. a red -> yellow -> green fade) easy.
Usage is much the same as L<Color::Spectrum>, except you can supply as many
colours as you wish.
# Procedural interface:
use Color::Spectrum::Multi qw(generate);
my @color = generate(10,'#FF0000','#00FF00', '#0000FF');
# OO interface:
use Color::Spectrum::Multi;
my $spectrum = Color::Spectrum::Multi->new();
my @color = $spectrum->generate(10,'#FF0000','#00FF00', '#0000FF');
=head1 DESCRIPTION
L<Color::Spectrum> provides an easy way to fade between two colours in a given
number of steps. This module is a simple wrapper around Color::Spectrum, making
it easy to fade between an arbitrary number of colours.
=head1 METHODS
=over
=item generate
Given the desired number of steps and two or more colours, returns a series of
colours.
=cut
sub generate {
my $self = shift if ref($_[0]) eq __PACKAGE__;
# If we have two or less colours, just allow Color::Spectrum to do its
# thing:
if (@_ <= 2) {
return Color::Spectrum::generate(@_);
}
my ($steps, @points) = @_;
my @colours;
my $steps_used = 0;
# take the first colour waypoint off:
my $startpoint = shift @points;
# How many steps do we get between each waypoint?
my $substeps = int($steps / scalar @points);
while(my $endpoint = shift @points) {
if (@points == 0) {
# there's no more points left... make sure we don't fall short
# on the number of steps:
if (($steps_used + $substeps) != $steps) {
$substeps = $steps - $steps_used;
}
}
# Since we start from the last colour of the previous fade, if this
# isn't the first fade, we want to generate one extra colour, and drop
# the first (otherwise, we'd duplicate colours)
my @colour_set =
Color::Spectrum::generate(
$steps_used ? $substeps+1 : $substeps, $startpoint,$endpoint
);
push @colours, $steps_used ? @colour_set[1..$substeps] : @colour_set;
# next fade will start from last colour of this fade:
$startpoint = $endpoint;
$steps_used += $substeps;
}
return @colours;
}
=back
=head1 AUTHOR
David Precious, C<< <davidp at preshweb.co.uk> >>
=head1 BUGS
Please report any bugs or feature requests to C<bug-color-spectrum-multi at rt.cpan.org>, or through
the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Color-Spectrum-Multi>. I will be notified, and then you'll
automatically be notified of progress on your bug as I make changes.
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
perldoc Color::Spectrum::Multi
You can also look for information at:
=over 4
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Color-Spectrum-Multi>
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Color-Spectrum-Multi>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Color-Spectrum-Multi>
=item * Search CPAN
L<http://search.cpan.org/dist/Color-Spectrum-Multi/>
=back
=head1 COPYRIGHT & LICENSE
Copyright 2009 David Precious, all rights reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=cut
1; # End of Color::Spectrum::Multi
|
