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  $gd->line($x1,$center,$x2,$center,$fg);
  if ($sw) {  # west arrow
    $gd->line($x1,$center,$x1+$a2,$center-$a2,$fg);
    $gd->line($x1,$center,$x1+$a2,$center+$a2,$fg);
  }
  if ($ne) {  # east arrow
    $gd->line($x2,$center,$x2-$a2,$center+$a2,$fg);
    $gd->line($x2,$center,$x2-$a2,$center-$a2,$fg);
  }

  # add a label if requested
  $self->draw_label($gd,@_) if $self->option('label');

}

1;

__END__

=head1 NAME

Ace::Graphics::Glyph::arrow - The "arrow" glyph

=head1 SYNOPSIS

  See L<Ace::Graphics::Panel> and L<Ace::Graphics::Glyph>.

=head1 DESCRIPTION

This glyph draws arrows.  Depending on options, the arrows can be
labeled, be oriented vertically or horizontally, or can contain major
and minor ticks suitable for use as a scale.

=head2 OPTIONS

In addition to the common options, the following glyph-specific
options are recognized:

  Option      Description               Default
  ------      -----------               -------

  -tick       Whether to draw major       0
              and minor ticks.
	      0 = no ticks
	      1 = major ticks
	      2 = minor ticks

  -parallel   Whether to draw the arrow   true
	      parallel to the sequence
	      or perpendicular to it.

  -northeast  Whether to draw the         true
	      north or east arrowhead
	      (depending on orientation)

  -southwest  Whether to draw the         true
	      south or west arrowhead
	      (depending on orientation)

Set -parallel to false to display a point-like feature such as a
polymorphism, or to indicate an important location.  If the feature
start == end, then the glyph will draw a single arrow at the
designated location:

       ^
       |

Otherwise, there will be two arrows at the start and end:

       ^              ^
       |              |

=head1 BUGS

Please report them.

=head1 SEE ALSO

L<Ace::Sequence>, L<Ace::Sequence::Feature>, L<Ace::Graphics::Panel>,
L<Ace::Graphics::Track>, L<Ace::Graphics::Glyph::anchored_arrow>,
L<Ace::Graphics::Glyph::arrow>,
L<Ace::Graphics::Glyph::box>,
L<Ace::Graphics::Glyph::primers>,
L<Ace::Graphics::Glyph::segments>,
L<Ace::Graphics::Glyph::toomany>,
L<Ace::Graphics::Glyph::transcript>,

=head1 AUTHOR

Lincoln Stein <lstein@cshl.org>.

Copyright (c) 2001 Cold Spring Harbor Laboratory

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.  See DISCLAIMER.txt for
disclaimers of warranty.

=cut