# NAME [GraphViz2::Parse::ISA](https://metacpan.org/pod/GraphViz2::Parse::ISA) - Visualize N Perl class hierarchies as a graph # SYNOPSIS use strict; use warnings; use File::Spec; use GraphViz2::Parse::ISA; my $parser = GraphViz2::Parse::ISA->new; unshift @INC, 't/lib'; $parser->add(class => 'Adult::Child::Grandchild', ignore => []); $parser->add(class => 'HybridVariety', ignore => []); $parser->generate_graph; my $format = shift || 'svg'; my $output_file = shift || "parse.code.$format"; $parser->graph->run(format => $format, output_file => $output_file); See scripts/parse.isa.pl. # DESCRIPTION Takes a class name and converts its class hierarchy into a graph. This can be done for N different classes before the graph is generated. You can write the result in any format supported by [Graphviz](http://www.graphviz.org/). # Constructor and Initialization ## Calling new() `new()` is called as `my($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. The default for [GraphViz2::Parse::ISA](https://metacpan.org/pod/GraphViz2::Parse::ISA) is to plot from the bottom to the top (Grandchild to Parent). This is the opposite of [GraphViz2](https://metacpan.org/pod/GraphViz2). This key is optional. # METHODS ## 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()"](#generate_graph) to actually trigger the call to the [GraphViz2](https://metacpan.org/pod/GraphViz2) methods add\_node() and add\_edge(). Returns $self for method chaining. See scripts/parse.isa.pl. ## generate\_graph() Processes the internal structure mentioned under add() to add all the nodes and edges to the graph. After that you call [GraphViz2](https://metacpan.org/pod/GraphViz2)'s run() method on the graph object. See ["graph()"](#graph). Returns $self for method chaining. See scripts/parse.isa.pl. ## graph() Returns the graph object, either the one supplied to new() or the one created during the call to new(). # Scripts Shipped with this Module ## scripts/parse.isa.pl Demonstrates combining 2 Perl class hierarchies on the same graph. Outputs to ./html/parse.isa.svg by default. Change this by providing a format argument (e.g. `svg`) and a filename argument. # THANKS Many thanks are due to the people who chose to make [Graphviz](http://www.graphviz.org/) Open Source. And thanks to [Leon Brocard](http://search.cpan.org/~lbrocard/), who wrote [GraphViz](https://metacpan.org/pod/GraphViz), and kindly gave me co-maint of the module. The code in add() was adapted from [GraphViz::ISA::Multi](https://metacpan.org/pod/GraphViz::ISA::Multi) by Marcus Thiesen, but that code gobbled up package declarations in comments and POD, so I used [Pod::Simple](https://metacpan.org/pod/Pod::Simple) to give me just the source code. # AUTHOR [GraphViz2](https://metacpan.org/pod/GraphViz2) was written by Ron Savage __ in 2011. Home page: [http://savage.net.au/index.html](http://savage.net.au/index.html). # COPYRIGHT 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: http://dev.perl.org/licenses/