Hi Monks,

i'm a Perl newbie trying to create a 3-levels stacked barchart chart using DBD:Chart, but so far i had no luck.

#!/usr/bin/perl -w

use DBI;
use DBD::Chart;

$dbh = DBI->connect('dbi:Chart:');
$dbh->do('create table stackbar (name varchar(10), yl integer, yh inte
+ger)');
$sth = $dbh->prepare('insert into stackbar values(?, ?, ?)');
$sth->execute('foo', 1, 20);
$sth->execute('foo', 20, 30);
$sth->execute('foo', 50, 30);
$sth->execute('bar', 1, 30);
$sth->execute('bar', 30, 40);
$sth->execute('bar', 70, 40);

$sth = $dbh->prepare("select barchart from stackbar
where WIDTH=500
AND HEIGHT=500
AND X_AXIS='Some Domain'
AND Y_AXIS='Some Range'
AND TITLE='Stacked Barchart Test'
AND FORMAT='PNG'
AND STACK=1
AND SHOWVALUES=1
AND COLORS IN ('green', 'yellow', 'red')");
$sth->execute;
$row = $sth->fetchrow_arrayref;

open(OUTF, ">barchart_graph.png");
binmode OUTF;
print OUTF $$row[0];
close OUTF;

$sth->finish;
$dbh->disconnect;
[download]

From the above code i expect a chart composed of 2 bars, each divided in 3 levels with different colors:

'foo': 1->20 green, 20->50 yellow, 50->80 red

'bar': 1->30 green, 30->70 yellow, 70->110 red

but what i get, instead, is a chart composed of 2 bars with 2 levels only:

'foo': 1->50 green, 50->80 yellow

'bar': 1->70 green, 70->110 yellow

What's wrong with my script?