GD::Graph question

[Phil Pennock]

On 2006-11-11 at 20:58 +0000, Adrian McMenamin wrote:
> I have used GD::Graph::pie without problems but I cannot get it to draw
> a line graph.

You have undefined data somewhere?

It's a bit hard to tell, since your example snippet refers to data you
don't define for us.

Filling in the blanks a bit, munging to get it to pass "perl -c", using
$graph->error instead of $graph_error, the below script works for me.

Does this help?

-----------------------------< cut here >-------------------------------
#!/usr/bin/perl
use warnings;
use strict;

use GD;
use GD::Graph;
use GD::Graph::lines;

my @pixel_dimensions = (800, 700);
my ($xrange, $yrange) = (20, 50);
my %formdata = (
	title	=> "Test",
	label	=> "charted",
);

my @votes;
for (my $i = 0; $i < $xrange; ++$i) {
	$votes[$i] = int(rand($yrange));
}

print "Content-type: image/png\r\n\r\n";

# $GD::Graph::Error::Debug = 5;

my $graph = GD::Graph::lines->new(@pixel_dimensions);

$graph->set(title => $formdata{"title"},
            label => $formdata{"label"},
            x_label => "X",
            y_label => "Y",
	    y_max_value => $yrange,
            );

my @data = (["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
"13", "14", "15", "16", "17", "18", "19", "20"], [$votes[0], $votes[1],
$votes[2], $votes[3], $votes[4], $votes[5], $votes[6], $votes[7],
$votes[8], $votes[9], $votes[10], $votes[11], $votes[12], $votes[13],
$votes[14], $votes[15], $votes[16], $votes[17], $votes[18],
$votes[19] ]);

$graph->set_title_font(gdLargeFont, 18);


print $graph->plot(\@data)->png or die $graph->error;

exit(0);
__END__