GraphViz2::Parse::ISA - Visualize N Perl class hierarchies as a graph


        #!/usr/bin/env perl

        use strict;
        use warnings;

        use File::Spec;

        use GraphViz2;
        use GraphViz2::Parse::ISA;

        use Log::Handler;

        # ------------------------------------------------

        my($logger) = Log::Handler -> new;

        $logger -> add
                 screen =>
                         maxlevel       => 'debug',
                         message_layout => '%m',
                         minlevel       => 'error',

        my($graph) = GraphViz2 -> new
                 edge   => {color => 'grey'},
                 global => {directed => 1},
                 graph  => {rankdir => 'BT'},
                 logger => $logger,
                 node   => {color => 'blue', shape => 'Mrecord'},
        my($parser) = GraphViz2::Parse::ISA -> new(graph => $graph);

        unshift @INC, 't/lib';

        $parser -> add(class => 'Adult::Child::Grandchild', ignore => []);
        $parser -> add(class => 'Hybrid', ignore => []);
        $parser -> generate_graph;

        my($format)      = shift || 'svg';
        my($output_file) = shift || File::Spec -> catfile('html', "parse.code.$format");

        $graph -> run(format => $format, output_file => $output_file);

See scripts/ ("Scripts Shipped with this Module" in GraphViz2).


Takes a class name and converts its class hierarchy into a graph. This can be done for N different classes before the graph is generated.

You can write the result in any format supported by Graphviz.

Here is the list of output formats.


This module is available as a Unix-style distro (*.tgz).

See for help on unpacking and installing distros.


Install GraphViz2 as you would for any Perl module:


        cpanm GraphViz2

or run:

        sudo cpan GraphViz2

or unpack the distro, and then either:

        perl Build.PL
        ./Build test
        sudo ./Build install


        perl Makefile.PL
        make (or dmake or nmake)
        make test
        make install

Constructor and Initialization

Calling new()

new() is called as my($obj) = GraphViz2::Parse::ISA -> new(k1 => v1, k2 => v2, ...).

It returns a new object of type GraphViz2::Parse::ISA.

Key-value pairs accepted in the parameter list:

o graph => $graphviz_object

This option specifies the GraphViz2 object to use. This allows you to configure it as desired.

The default is GraphViz2 -> new. The default attributes are the same as in the synopsis, above, except for the logger of course, which defaults to ''.

This key is optional.


add(class => $class[, ignore => $ignore])

Adds the class hierarchy of $class to an internal structure.

$class is the name of the class whose parents are to be found.

$ignore is an optional arrayref of class names to ignore. The value of $ignore is not preserved between calls to add().

After all desired calls to add(), you must call "generate_graph()" to actually trigger the call to the GraphViz2 methods add_node() and add_edge().

Returns $self for method chaining.

See scripts/


Processes the internal structure mentioned under add() to add all the nodes and edges to the graph.

After that you call GraphViz2's run() method on the graph object. See "graph()".

Returns $self for method chaining.

See scripts/


Returns the graph object, either the one supplied to new() or the one created during the call to new().


See "FAQ" in GraphViz2 and "Scripts Shipped with this Module" in GraphViz2.


Many thanks are due to the people who chose to make Graphviz Open Source.

And thanks to Leon Brocard, who wrote GraphViz, and kindly gave me co-maint of the module.

The code in add() was adapted from GraphViz::ISA::Multi by Marcus Thiesen, but that code gobbled up package declarations in comments and POD, so I used Pod::Simple to give me just the source code.

Version Numbers

Version numbers < 1.00 represent development versions. From 1.00 up, they are production versions.

Machine-Readable Change Log

The file Changes was converted into Changelog.ini by Module::Metadata::Changes.


Email the author, or log a bug on RT:


GraphViz2 was written by Ron Savage <> in 2011.

Home page:


Australian copyright (c) 2011, Ron Savage.

        All Programs of mine are 'OSI Certified Open Source Software';
        you can redistribute them and/or modify them under the terms of
        The Perl License, a copy of which is available at: