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package Bio::Graphics::Glyph::triangle;
# DAS-compatible package to use for drawing a triangle
use strict;
use base qw(Bio::Graphics::Glyph::point_glyph);
sub pad_left {
my $self = shift;
my $left = $self->SUPER::pad_left;
return $left unless $self->option('point');
my $extra = $self->option('height')/3;
return $extra > $left ? $extra : $left;
}
sub pad_right {
my $self = shift;
my $right = $self->SUPER::pad_right;
return $right unless $self->option('point');
my $extra = $self->option('height')/3;
return $extra > $right ? $extra : $right;
}
sub orient {
my $self = shift;
my $o = $self->option('orient');
$o = $self->option('direction') unless defined $o;
return $o || 'S';
}
sub draw_component {
my $self = shift;
my $gd = shift;
my $fg = $self->fgcolor;
my $orient = $self->option('orient') || 'S';
# find the center and vertices
my ($x1,$y1,$x2,$y2) = $self->calculate_boundaries(@_);
my $xmid = ($x1+$x2)/2;
my $ymid = ($y1+$y2)/2;
my ($vx1,$vy1,$vx2,$vy2,$vx3,$vy3);
#make an equilateral
my ($p,$q) = ($self->option('height'),($x2-$x1)/2);
if ($self->option('point')){
$q = $p/sqrt(3); #2;
$x1 = $xmid - $q; $x2 = $xmid + $q;
$y1 = $ymid - $q; $y2 = $ymid + $q;
}
if ($orient eq 'S'){$vx1=$x1;$vy1=$y1;$vx2=$x2;$vy2=$y1;$vx3=$xmid;$vy3=$y2;}
elsif($orient eq 'N'){$vx1=$x1;$vy1=$y2;$vx2=$x2;$vy2=$y2;$vx3=$xmid;$vy3=$y1;}
elsif($orient eq 'W'){$vx1=$x2;$vy1=$y1;$vx2=$x2;$vy2=$y2;$vx3=$x2-$q*2;$vy3=$ymid;}
elsif($orient eq 'E'){$vx1=$x1;$vy1=$y1;$vx2=$x1;$vy2=$y2;$vx3=$x1+$q*2;$vy3=$ymid;}
# now draw the triangle
my $poly_pkg = $self->polygon_package;
my $poly = $poly_pkg->new();
$poly->addPt($vx1,$vy1);
$poly->addPt($vx2,$vy2);
$poly->addPt($vx3,$vy3);
if (my $c = $self->bgcolor){
$gd->filledPolygon($poly,$c);
}
$gd->polygon($poly,$fg);
}
1;
__END__
=head1 NAME
Bio::Graphics::Glyph::triangle - The "triangle" glyph
=head1 SYNOPSIS
See L<Bio::Graphics::Panel> and L<Bio::Graphics::Glyph>.
=head1 DESCRIPTION
This glyph draws an equilateral triangle when -point is defined.
It draws an isoceles triangle otherwise. It is possible to draw
the triangle with the base on the N, S, E, or W side.
=head2 OPTIONS
In addition to the common options, the following glyph-specific
options are recognized:
Option Description Default
------ ----------- -------
-point If true, the triangle 0
will drawn at the center
of the range, and not scaled
to the feature width.
-orient On which side shall the S
base be? (NSEW)
=head1 BUGS
Please report them.
=head1 SEE ALSO
L<Bio::Graphics::Panel>,
L<Bio::Graphics::Glyph>,
L<Bio::Graphics::Glyph::arrow>,
L<Bio::Graphics::Glyph::cds>,
L<Bio::Graphics::Glyph::crossbox>,
L<Bio::Graphics::Glyph::diamond>,
L<Bio::Graphics::Glyph::dna>,
L<Bio::Graphics::Glyph::dot>,
L<Bio::Graphics::Glyph::ellipse>,
L<Bio::Graphics::Glyph::extending_arrow>,
L<Bio::Graphics::Glyph::generic>,
L<Bio::Graphics::Glyph::graded_segments>,
L<Bio::Graphics::Glyph::heterogeneous_segments>,
L<Bio::Graphics::Glyph::line>,
L<Bio::Graphics::Glyph::pinsertion>,
L<Bio::Graphics::Glyph::primers>,
L<Bio::Graphics::Glyph::rndrect>,
L<Bio::Graphics::Glyph::segments>,
L<Bio::Graphics::Glyph::ruler_arrow>,
L<Bio::Graphics::Glyph::toomany>,
L<Bio::Graphics::Glyph::transcript>,
L<Bio::Graphics::Glyph::transcript2>,
L<Bio::Graphics::Glyph::translation>,
L<Bio::Graphics::Glyph::triangle>,
L<Bio::DB::GFF>,
L<Bio::SeqI>,
L<Bio::SeqFeatureI>,
L<Bio::Das>,
L<GD>
=head1 AUTHOR
Allen Day E<lt>day@cshl.orgE<gt>.
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
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