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				     -width   => 800);

new() will return undef in case of an error.

Note that if you use the "left" or "right" key styles, you are
responsible for allocating sufficient -pad_left or -pad_right room for
the labels to appear.  The necessary width is the number of characters
in the longest key times the font width (gdMediumBoldFont by default)
plus 3 pixels of internal padding.  The simplest way to calculate this
is to iterate over the possible track labels, find the largest one,
and then to compute its width using the formula:

  $width = gdMediumBoldFont->width * length($longest_key) +3;

In order to obtain scalable vector graphics (SVG) output, you should
pass new() the -image_class=E<gt>'GD::SVG' parameter. This will cause
Bio::Graphics::Panel to load the optional GD::SVG module. See the gd()
and svg() methods below for additional information.

You can tile an image onto the panel either before or after it draws
the grid. Simply provide the filename of the image in the -background