#!/usr/bin/env perl
#
# Note: t/test.t searches for the next line.
# Annotation: Demonstrates a trivial 3-node graph, with colors.

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  => {rankdir => 'TB'},
	 logger => $logger,
	 node   => {shape => 'oval'},
	);

$graph -> default_node(shape     => 'circle', style => 'filled');
$graph -> default_edge(arrowsize => 4);

$graph -> add_node(name => 'Carnegie', shape => 'circle');
$graph -> add_node(name => 'Carnegie', color => 'red');

$graph -> default_node(style => 'rounded');

$graph -> add_node(name => 'Murrumbeena', shape => 'doublecircle', color => 'green');
$graph -> add_node(name => 'Oakleigh',    shape => 'oval',         color => 'blue');

$graph -> add_edge(from => 'Murrumbeena', to => 'Carnegie', arrowsize => 2);

$graph -> default_edge(arrowsize => 4);

$graph -> add_edge(from => 'Murrumbeena', to => 'Oakleigh', color => 'brown');

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

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