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 		    -fgcolor   =>  'black',
 		    -bump      =>  +1,
 		    -height    => 10,
 		    -label     => 1);

=item $track = unshift_track($glyph,$features,@options)

unshift_track() works like add_track(), except that the new track is
added to the top of the image rather than the bottom.

B<Adding groups of features:> It is not uncommon to add a group of
features which are logically connected, such as the 5' and 3' ends of
EST reads.  To group features into sets that remain on the same
horizontal position and bump together, pass the sets as an anonymous
array.  To connect the groups by a dashed line, pass the
-connect_groups argument with a true value.  For example:

  $panel->add_track(segments => [[$abc_5,$abc_3],
				 [$xxx_5,$xxx_3],
				 [$yyy_5,$yyy_3]],
		    -connect_groups => 1);

=item $gd = $panel->gd

The gd() method lays out the image and returns a GD::Image object
containing it.  You may then call the GD::Image object's png() or
jpeg() methods to get the image data.

=item $png = $panel->png

The png() method returns the image as a PNG-format drawing, without
the intermediate step of returning a GD::Image object.

=item $boxes = $panel->boxes

=item @boxes = $panel->boxes

The boxes() method returns the coordinates of each glyph, useful for
constructing an image map.  In a scalar context, boxes() returns an
array ref.  In an list context, the method returns the array directly.

Each member of the list is an anonymous array of the following format:

  [ $feature, $x1, $y1, $x2, $y2 ]

The first element is the feature object; either an
Ace::Sequence::Feature, a Das::Segment::Feature, or another Bioperl
Bio::SeqFeatureI object.  The coordinates are the topleft and
bottomright corners of the glyph, including any space allocated for
labels.

=back

=head2 ACCESSORS

The following accessor methods provide access to various attributes of
the panel object.  Called with no arguments, they each return the
current value of the attribute.  Called with a single argument, they
set the attribute and return its previous value.

Note that in most cases you must change attributes prior to invoking
gd(), png() or boxes().  These three methods all invoke an internal
layout() method which places the tracks and the glyphs within them,
and then caches the result.

   Accessor Name      Description
   -------------      -----------

   width()	      Get/set width of panel
   spacing()	      Get/set spacing between tracks
   length()	      Get/set length of segment (bp)
   pad_top()	      Get/set top padding
   pad_left()	      Get/set left padding
   pad_bottom()	      Get/set bottom padding
   pad_right()	      Get/set right padding

=head2 INTERNAL METHODS

The following methods are used internally, but may be useful for those
implementing new glyph types.

=over 4

=item @names = Ace::Graphics::Panel->color_names

Return the symbolic names of the colors recognized by the panel
object.  In a scalar context, returns an array reference.

=item @rgb = $panel->rgb($index)

Given a GD color index (between 0 and 140), returns the RGB triplet
corresponding to this index.  This method is only useful within a
glyph's draw() routine, after the panel has allocated a GD::Image and
is populating it.

=item $index = $panel->translate($color)

Given a color, returns the GD::Image index.  The color may be
symbolic, such as "turquoise", or a #RRGGBB triple, as in #F0E0A8.
This method is only useful within a glyph's draw() routine, after the
panel has allocated a GD::Image and is populating it.

=item $panel->set_pen($width,$color)

Changes the width and color of the GD drawing pen to the values
indicated.  This is called automatically by the GlyphFactory fgcolor()
method.

=back

=head1 BUGS

Please report them.

=head1 SEE ALSO

L<Ace::Sequence>,L<Ace::Sequence::Feature>,
L<Ace::Graphics::Track>,L<Ace::Graphics::Glyph>,
L<GD>

=head1 AUTHOR