Graph::Writer::VCG - write out directed graph in VCG format

       Neil Bowers <neil@bowers.com>

       Copyright  (c)  2001-2012,  Neil  Bowers. All rights reserved.  Copyright (c) 2001, Canon Research Centre
       Europe. All rights reserved.

       This script is free software; you can redistribute it and/or modify it  under  the  same  terms  as  Perl
       itself.

perl v5.32.1                                       2021-09-19                            Graph::Writer::VCG(3pm)

Graph::Writer::VCG is a class for writing out a directed graph in the file format used by the VCG tool,
       originally developed for Visualising Compiler Graphs.  The graph must be an instance of the Graph class,
       which is actually a set of classes developed by Jarkko Hietaniemi.

       If you have defined any attributes for the graph, nodes, or edges, they will be written out to the file,
       as long as they are attributes understood by VCG.

       •   Attributes  with  non-atomic  values  aren't  currently  handled.   This includes the loc, classname,
           colorentry, and infoname attributes for graphs, and the loc attribute for nodes,

       •   Can currently only handle graph, node, and edge elements and their attributes.  So doesn't know about
           foldnode_defaults and things like that.

new()
       Constructor - generate a new writer instance.

         $writer = Graph::Writer::VCG->new();

       This doesn't take any arguments.

   write_graph()
       Write a specific graph to a named file:

         $writer->write_graph($graph, $file);

       The $file argument can either be a filename, or a filehandle for a previously opened file.

       Graph::Writer::VCG - write out directed graph in VCG format

       <https://github.com/neilb/Graph-ReadWrite>

http://www.cs.uni-sb.de/RW/users/sander/html/gsvcg1.html
           The home page for VCG.

       Graph
           Jarkko  Hietaniemi's  modules  for  representing  directed  graphs,   available   from   CPAN   under
           modules/by-module/Graph/

       Algorithms in Perl
           The O'Reilly book which has a chapter on directed graphs, which is based around Jarkko's modules.

       Graph::Writer
           The base-class for Graph::Writer::VCG

         use Graph;
         use Graph::Writer::VCG;

         $graph = Graph->new();
         # add edges and nodes to the graph

         $writer = Graph::Writer::VCG->new();
         $writer->write_graph($graph, 'mygraph.vcg');