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--TEST--
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Unit test for graph with clusters
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--FILE--
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<?php
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/**
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 * Test 17: "Process diagram with clusters"
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 *
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 * Graph definition taken from GraphViz documentation
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 *
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 * @category Image
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 * @package  Image_GraphViz
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 * @author   Philippe Jausions <jausions@php.net>
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 */
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require_once 'Image/GraphViz.php';
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$graph = new Image_GraphViz(true, array(), 'G', false);
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// cluster0
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$graph->addCluster('cluster0', 'process #1',
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                   array('style' => 'filled', 'color' => 'lightgrey'));
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$graph->addNode('a0', null, 'cluster0');
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$graph->addNode('a1', null, 'cluster0');
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$graph->addNode('a2', null, 'cluster0');
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$graph->addNode('a3', null, 'cluster0');
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$graph->addEdge(array('a0' => 'a1'));
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$graph->addEdge(array('a1' => 'a2'));
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$graph->addEdge(array('a2' => 'a3'));
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// cluster1
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$graph->addCluster('cluster1', 'process #2',
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                   array('color' => 'blue'));
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$graph->addNode('b0', null, 'cluster1');
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$graph->addNode('b1', null, 'cluster1');
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$graph->addNode('b2', null, 'cluster1');
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$graph->addNode('b3', null, 'cluster1');
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$graph->addEdge(array('b0' => 'b1'));
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$graph->addEdge(array('b1' => 'b2'));
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$graph->addEdge(array('b2' => 'b3'));
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// Global
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$graph->addNode('start', array('shape' => 'Mdiamond'));
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$graph->addNode('end', array('shape' => 'Msquare'));
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$graph->addEdge(array('start' => 'a0'));
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$graph->addEdge(array('start' => 'b0'));
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$graph->addEdge(array('a1' => 'b3'));
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$graph->addEdge(array('b2' => 'a3'));
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$graph->addEdge(array('a3' => 'a0'));
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$graph->addEdge(array('a3' => 'end'));
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$graph->addEdge(array('b3' => 'end'));
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echo $graph->parse();
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?>
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--EXPECT--
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digraph G {
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    start [ shape=Mdiamond ];
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    end [ shape=Msquare ];
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    subgraph cluster0 {
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        graph [ style=filled,color=lightgrey,label="process #1" ];
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        a0;
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        a1;
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        a2;
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        a3;
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    }
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    subgraph cluster1 {
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        graph [ color=blue,label="process #2" ];
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        b0;
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        b1;
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        b2;
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        b3;
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    }
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    a0 -> a1;
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    a1 -> a2;
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    a1 -> b3;
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    a2 -> a3;
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    b0 -> b1;
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    b1 -> b2;
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    b2 -> b3;
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    b2 -> a3;
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    start -> a0;
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    start -> b0;
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    a3 -> a0;
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    a3 -> end;
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    b3 -> end;
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}