=item dclrs (short for datacolours)

This controls the colors for the bars, lines, markers, or pie slices.
This should be a reference to an array of colour names as defined in
L<GD::Graph::colour> (S<C<perldoc GD::Graph::colour>> for the names available).

    $graph->set( dclrs => [ qw(green pink blue cyan) ] );


##</code><code>##

    _rgb($self->{dclrs}[$_[0] % @{$self->{dclrs}} - 1]);


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add_colour(colourname => [$r, $g, $b]) or add_colour('#7fe310')

Self-explanatory. Exported with the :colours tag.