*
* Rending a graph to an image will only work if you have the
* GraphViz 'dot' command installed.
*
* @package EasyRdf
* @copyright Copyright (c) 2012-2013 Nicholas J Humfrey
* @license http://unlicense.org/
*/
set_include_path(get_include_path() . PATH_SEPARATOR . '../lib/');
require_once "EasyRdf.php";
require_once "html_tag_helpers.php";
$formats = array('PNG' => 'png', 'GIF' => 'gif', 'SVG' => 'svg');
$format = EasyRdf_Format::getFormat(isset($_REQUEST['format']) ? $_REQUEST['format'] : 'png');
// Construct a graph of three people
$graph = new EasyRdf_Graph();
$graph->set('foaf:knows', 'rdfs:label', 'knows');
$bob = $graph->resource('http://www.example.com/bob', 'foaf:Person');
$alice = $graph->resource('http://www.example.com/alice', 'foaf:Person');
$carol = $graph->resource('http://www.example.com/carol', 'foaf:Person');
$bob->set('foaf:name', 'Bob');
$alice->set('foaf:name', 'Alice');
$carol->set('foaf:name', 'Carol');
$bob->add('foaf:knows', $alice);
$bob->add('foaf:knows', $carol);
$alice->add('foaf:knows', $bob);
$alice->add('foaf:knows', $carol);
// Create a GraphViz serialiser
$gv = new EasyRdf_Serialiser_GraphViz();
$gv->setUseLabels(isset($_REQUEST['ul']));
$gv->setOnlyLabelled(isset($_REQUEST['ol']));
// If this is a request for the image, just render it and exit
