GD::Graph

use GD::Graph::linespoints;
require 'save.pl';

print STDERR "Processing sample42\n";

@data = read_data_from_csv("sample42.dat")
or die "Cannot read data from sample42.dat";

$my_graph = new GD::Graph::linespoints( );

$my_graph->set(
x_label => 'X Label',
y_label => 'Y label',
title => 'A Lines and Points Graph, reading a CSV file',
y_max_value => 80,
y_tick_number => 6,
y_label_skip => 2,
markers => [ 1, 5 ],

transparent => 0,
);

$my_graph->set_legend( 'data set 1', 'data set 2' );
$my_graph->plot(\@data);
save_chart($my_graph, 'sample42');


sub read_data_from_csv
{
my $fn = shift;
my @d = ();

open(ZZZ, $fn) || return ();

while ()
{
chomp;
# you might want Text::CSV here
my @row = split /,/;

for (my $i = 0; $i <= $#row; $i++)
{
undef $row[$i] if ($row[$i] eq 'undef');
push @{$d[$i]}, $row[$i];
}
}

close (ZZZ);

return @d;
}