Monks,

I've recently started playing with the Graph::Layout::Aesthetic (0.08) module and have come across a few problems that I was hoping someone might have encountered before.

My first one was the Graph::Layout::Aesthetic::Topology->from_graph subroutine was failing because the Graph I was sending it contained newer vertices (05) and I was getting and error that my graph was not o2 compatible. I set a flag to downconvert my graph to use vertices02 and that got past that then added a check in the Topology.pm instead to forward to the right command depending on the version of the vertices.

Now I'm having another problem with the from_graph functionality as I'm getting an error whilst trying to feed my topology to the Graph::Layout::Aesthetic::Monitor::GnuPlot->plot. 

gnuplot> plot "-"
                 ^
         line 1: no data point found in specified file

Unexpected returncode from gnuplot: 256 at /usr/lib/perl5/site_perl/5.
+8/cygwin/Graph/Layout/Aesthetic/Monitor/GnuPlot.pm line 117.

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using the following code... 
#!/usr/bin/perl

use strict;
use Graph;
use Graph::Layout::Aesthetic::Topology;
use Graph::Layout::Aesthetic::Monitor::GnuPlot;

my $g = Graph->new();

$g->add_vertex("V1");
$g->add_vertex("V2");

my $topology = Graph::Layout::Aesthetic::Topology->from_graph($g);

my $monitor = Graph::Layout::Aesthetic::Monitor::GnuPlot->new();
my $aglo = Graph::Layout::Aesthetic->new($topology);

$monitor->plot($aglo);

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Here is the bit I don't understand, there is another method of Topology called new_vertices where I can send it data directly and this works fine. The only thing is I can't find the new_vertices subroutine, it not in Topology.pm at all? I thought it might get inherited from another of the parent modules, but can't find it in there also. The man of Topology says $graph = Graph::Layout::Aesthetic::Topology->new_vertices($nr_vertices); but I can't find the code? Once I have the code I'll be able to compare the implementations so that I can get from_graph working. It takes and argument $class which is how it calls new_vertices and I'm guessing is why my from_graph call is falling, but where is the code for new_vertices?
Thanks in advance for help.

Regards Paul.

In reply to Graph::Layout::Aesthetic::Topology question by thekestrel

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