My advice is to break down the problem into small junks which you can understand. First, see if you can create a GD graph manually with your data, then if successful,
see if your object output is suitable for input to GD::graph.
GD graph has some nested arrays it uses for input, for example, see how the data
is arranged in the following example. Make sure your input is like that.
#!/usr/bin/perl -w
use strict;
use GD::Graph::bars;
my @data = ( [qw(a b c d e f g)], [1,2,3,4,5,6,7] );
my $graph = GD::Graph::bars->new(200, 200);
$graph->set(
transparent => '0',
bgclr => 'lgray',
boxclr => 'white',
fgclr => 'white',
cycle_clrs => '1',
x_label => 'X Label',
y_label => 'Y label',
);
my $gd = $graph->plot(\@data);
binmode STDOUT;
#print "Content-type: image/png\n\n";
print $gd->png();
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