/**
* create a new directed Edge from Vertex $from to Vertex $to
*
* @param Vertex $from start/source Vertex
* @param Vertex $to end/target Vertex
* @see Vertex::createEdgeTo() to create directed edges
* @see Vertex::createEdge() to create undirected edges
*/
public function __construct(Vertex $from, Vertex $to)
{
if ($from->getGraph() !== $to->getGraph()) {
throw new InvalidArgumentException('Vertices have to be within the same graph');
}
$this->from = $from;
$this->to = $to;
$from->getGraph()->addEdge($this);
$from->addEdge($this);
$to->addEdge($this);
}
/**
* create a new undirected edge between given vertices
*
* @param Vertex $a
* @param Vertex $b
* @see Vertex::createEdge() instead
*/
public function __construct(Vertex $a, Vertex $b)
{
if ($a->getGraph() !== $b->getGraph()) {
throw new InvalidArgumentException('Vertices have to be within the same graph');
}
$this->a = $a;
$this->b = $b;
$a->getGraph()->addEdge($this);
$a->addEdge($this);
$b->addEdge($this);
}
