#!/usr/bin/env perl
#
# Note: t/test.t searches for the next line.
# Annotation: Demonstrates clusters with and without frames.

use strict;
use warnings;

use File::Spec;

use GraphViz2;

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  => {label => 'Demo of 3 subgraphs (2 being clusters), and 1 frame', rankdir => 'TB'},
	 logger => $logger,
	 node   => {shape => 'oval'},
	);

$graph -> add_node(name => 'One', color => 'red',   shape => 'circle');
$graph -> add_node(name => 'Two', color => 'green', shape => 'doublecircle');

$graph -> add_edge(from => 'One', to => 'Two', color => 'maroon', penwidth => 3);

$graph -> push_subgraph
(
	graph    => {label => 'Child the First'},
	name     => 'cluster First subgraph',
	node     => {color => 'magenta', shape => 'diamond'},
	subgraph => {pencolor => 'white'}, # Required because name =~ /^cluster/.
);

$graph -> add_node(name => 'Three'); # Default color and shape.
$graph -> add_node(name => 'Four',  color => 'orange', shape => 'rectangle');

$graph -> add_edge(from => 'Three', to => 'Four', penwidth => 3);

$graph -> pop_subgraph;

$graph -> push_subgraph
(
	graph    => {label => 'Child the Second'},
	name     => 'cluster Second subgraph',
	node     => {color => 'magenta', shape => 'diamond'},
	subgraph => {pencolor => 'purple'}, # Required because name =~ /^cluster/.
);

$graph -> add_node(name => 'Five', color => 'blue'); # Default shape.
$graph -> add_node(name => 'Six',  color => 'orange', shape => 'rectangle');

$graph -> add_edge(from => 'Five', to => 'Six', penwidth => 3);

$graph -> pop_subgraph;

$graph -> push_subgraph
(
	name     => 'Third subgraph',
	graph    => {label => 'Child the Third'},
	node     => {color => 'magenta', shape => 'diamond'},
);

$graph -> add_node(name => 'Seven', color => 'blue',   shape => 'doubleoctagon');
$graph -> add_node(name => 'Eight', color => 'orange', shape => 'rectangle');

$graph -> add_edge(from => 'Seven', to => 'Eight', penwidth => 3);

$graph -> pop_subgraph;

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

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