#!/usr/bin/env perl
#
# Note: t/test.t searches for the next line.
# Annotation: Demonstrates a cluster - with a bug. See the TODO in the POD.
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 => {clusterrank => 'local', compound => 1, rankdir => 'TB'},
logger => $logger,
node => {shape => 'oval'},
);
$graph -> push_subgraph(name => 'cluster_Europe', graph => {bgcolor => 'grey', label => 'Europe'});
$graph -> add_node(name => 'London', color => 'blue');
$graph -> add_node(name => 'Paris', color => 'green', label => 'City of\nlurve');
$graph -> add_edge(from => 'London', to => 'Paris');
$graph -> add_edge(from => 'Paris', to => 'London');
$graph -> pop_subgraph;
$graph -> add_node(name => 'New York', color => 'yellow');
$graph -> add_edge(from => 'London', to => 'New York', label => 'Far');
$graph -> push_subgraph(name => 'cluster_Australia', graph => {bgcolor => 'grey', label => 'Australia'});
$graph -> add_node(name => 'Victoria', color => 'blue');
$graph -> add_node(name => 'New South Wales', color => 'green');
$graph -> add_node(name => 'Tasmania', color => 'red');
$graph -> add_edge(from => 'Victoria', to => 'New South Wales');
$graph -> add_edge(from => 'Victoria', to => 'Tasmania');
$graph -> pop_subgraph;
$graph -> add_edge(from => 'cluster_Australia', to => 'cluster_Europe');
my($format) = shift || 'svg';
my($output_file) = shift || File::Spec -> catfile('html', "cluster.$format");
$graph -> run(format => $format, output_file => $output_file);