NAME
    Number::RGB - Manipulate RGB Tuples

SYNOPSIS
      use Number::RGB;
      my $white :RGB(255);
      my $black :RGB(0);

      my $gray = $black + (($white - $black) / 2);

      my @rgb = @{ $white->rgb };
      my $hex = $black->hex;

      my $blue   = Number::RGB->new(rgb => [0,0,255]);
      my $green  = Number::RGB->new(hex => '#00FF00');

      my $red :RGB(255,0,0);

      my $purple = $blue + $green;
      my $yellow = $red  + $green;

DESCRIPTION
    This module creates RGB tuple objects and overloads their operators to
    make RGB math easier. An attribute is also exported to the caller to
    make construction shorter.

  Methods
    "new()"
          my $red   = Number::RGB->new(rgb => [255,0,0])
          my $blue  = Number::RGB->new(hex => '#0000FF');
          my $black = Number::RGB->new(rgb_number => 0);

        This constructor accepts named parameters. One of three parameters
        are required.

        "rgb" is a list reference containing three intergers within the
        range of 0..255. In order, each interger represents *red*, *green*,
        and *blue*.

        "hex" is a hexidecimal representation of an RGB tuple commonly used
        in Cascading Style Sheets. The format begins with an optional hash
        ("#") and follows with three groups of hexidecimal numbers
        represending *red*, *green*, and *blue* in that order.

        "rgb_number" is a single integer which represents all primary
        colors. This is shorthand to create *white*, *black*, and all shades
        of *gray*.

        This method throws and exception on error, which should be caught
        with "eval".

    "r()"
        Accessor and mutator for the *red* value.

    "g()"
        Accessor and mutator for the *green* value.

    "b()"
        Accessor and mutator for the *blue* value.

    "rgb()"
        Returns a list reference containing three elements. In order they
        represent *red*, *green*, and *blue*.

    "hex()"
        Returns a hexidecimal represention of the tuple conforming to the
        format used in Cascading Style Sheets.

    "hex_uc()"
        Returns the same thing as "hex()", but any hexidecimal numbers that
        include 'A'..'F' will be uppercased.

    "as_string()"
        Returns a string representation of the tuple. For example, *black*
        would be the string "255,255,255".

    "new_from_guess()"
          my $color = Number::RGB->new_from_guess(input());

        This constructor tries to guess the format being used and returns a
        tuple object. If it can't guess, an exception will be thrown.

  Attributes
    ":RGB()"
          my $red   :RGB(255,0,0);
          my $blue  :RGB(#0000FF);
          my $white :RGB(0);

        This attribute is exported to the caller and provides a shorthand
        wrapper around "new_from_guess()".

AUTHOR
    Casey West, <casey@geeknest.com>.

COPYRIGHT
      Copyright (c) 2004 Casey West.  All rights reserved.
      This module is free software; you can redistribute it and/or modify it
      under the same terms as Perl itself.