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}

sub add_tracks{
my $panel = shift;

# ruler
can_ok($panel, qw(add_track));
$panel->add_track(
	Bio::Graphics::Feature->new(-start => $gene_minus->start-100, -end => $gene_minus->end),
	-glyph  => 'arrow',
	-bump   => 0,
	-double => 1,
	-tick   => 2
);
ok(1, 'ruler made');

$panel->add_track
(
	$gene_minus,
	-glyph => 'decorated_gene',
	-decoration_visible => 1,	
	-height => 12,
	-decoration_color		=> 'black',
	#-decoration_height   => #default is 2 less than the track height
);
ok(1, 'track1 added');

$panel->add_track
(
	$gene_minus,
	-glyph => 'decorated_gene',
	-decoration_visible => 1,	
	-height => 12,
	-decoration_color		=> 'black',
	-decoration_height   => 5
);
ok(1, 'track2 added');

$panel->add_track
(
	$gene_minus,
	-glyph => 'decorated_gene',
	-decoration_visible => 1,	
	-height => 12,
	-decoration_color		=> 'black',
	-decoration_height   => 24
);
ok(1, 'track3 added');

$panel->add_track
(
	$utr_gene,
	-glyph => 'decorated_gene',
	-decoration_visible => 1,	
	-height => 12,
	-decoration_color		=> 'black',
	-decoration_height   => 24
);
ok(1, 'track4 added');

#can be used with transparent boxes to show highlights
$panel->add_track
(
	$gene_minus,
	-glyph => 'decorated_gene',
	-decoration_visible => 1,	
	-height => 12,
	-decoration_color		=> 'transparent', #special colour to make outlines
	-decoration_border       => 'solid', 
	-decoration_border_color => 'red',
	-decoration_height   => 24
);
ok(1, 'track5 added');

$panel->add_track
(
	$gene_minus,
	-glyph => 'decorated_gene',
	-decoration_visible => 1,	
	-height => 12,
	-decoration_color		=> 'black',
	-decoration_height   	=> sub { 
			my ($feature, $option_name, $part_no, $total_parts, $glyph) = @_;	
			return '5' if ($glyph->active_decoration->name eq "TM");
			return '24' if ($glyph->active_decoration->type eq "SignalP4");
			return '10';
	},
);
ok(1, 'track6 added');
};
# write image
my $png = $panel->png;
is($png,$panel->png,'png created');
my $imgfile = "t/data/heights.png";
system("rm $imgfile") if (-e $imgfile);
open(IMG,">$imgfile") or die "could not write to file $imgfile";
print IMG $png;
close(IMG);
ok(-e $imgfile, 'imgfile created');
my $filesize = -s $imgfile;
isnt($filesize,0, 'check nonzero filesize');

SKIP: {
    eval{ require GD::SVG };
    skip "GD::SVG not installed", 2 if $@;

	my $svg = $panel2->svg;
	#is($svg,$panel2->svg,'svg created');
	my $svgfile = "t/data/heights.svg";
	system("rm $svgfile") if (-e $svgfile);
	open(IMG,">$svgfile") or die "could not write to file $svgfile";
	print IMG $svg;
	close(IMG);
	ok(-e $svgfile, 'svgfile created');
	$filesize = -s $svgfile;
	isnt($filesize,0, 'check nonzero filesize');
}