| Subject: | Bug in shadow handling with cumulative bar charts |
Using GDGraph 1.33 installed via PPM with ActivePerl build 630 (perl v5.6.1) on Windows 2000.
When drawing cumulative bar charts (GD::Graph::bars with the cumulate => 1 option) and using shadows (shadow_depth => -4), shadows are misplaced.
Running the attached script generates a PNG file where the shadow covers part of the lower (red) bars, but the upper (green) bars are on top of the shadow. Thus, the green bars seem to stick out above the red bars. Using the attached code, look at the border between the red and green sections for ASP and CFML at the right of the bar. Without shadows, the red and green bars are the same width. With shadows, the green bar is wider.
I hope this information is helpful.
Tom Hukins <tom@eborcom.com>
#!/usr/bin/perl
use strict;
use warnings;
use GD::Graph::bars ();
my @data = (
[qw(ASP Perl Ruby CFML Java)],
[qw(4 9 7 2 5)],
[qw(2 6 7 2 5)]
);
my $graph = GD::Graph::bars->new(400, 300);
$graph->set(
x_label => 'Language',
y_label => 'Coolness',
y_max_value => 20,
title => 'How cool is your language?',
bar_spacing => 1,
transparent => 0,
shadow_depth => -4,
cumulate => 1
);
my $gd = $graph->plot(\@data);
my $png = $gd->png;