in reply to Problem passing GD image object

Your immediate problem is that the line:

    $graphimage = $graph->plot(\@data) or die $graph->error;

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in sub plot replaces the object you passed in. The easiest way to handle the issue is to simply return the object from plot. You don't need to pass anything in:

my $g = plot ();
...

sub plot {
    my @data = (
    ...
    ) or die $graph->error;

    return $graph->plot(\@data) or die $graph->error;
}

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DWIM is Perl's answer to Gödel

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Re^2: Problem passing GD image object
by cormanaz (Deacon) on Mar 18, 2007 at 00:45 UTC
    You're right, that fixed it. Thanks.

    I still don't understand, tho. Even if I replaced the object, it seems like the replaced object should have worked anyway.

[reply]

      You would need to pass a reference to the object then update the referenced value:

      plot (\$g);
...

    $$graphimage = $graph->plot(\@data) or die $graph->error;

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      DWIM is Perl's answer to Gödel
[reply]
[d/l]

In Section Seekers of Perl Wisdom