/**
* get set of all Edges parallel to this edge (excluding self)
*
* @param Edge $edge
* @return Edges
* @throws LogicException
*/
public function getEdgesParallelEdge(Edge $edge)
{
if ($edge instanceof DirectedEdge) {
// get all edges between this edge's endpoints
$edges = $edge->getVertexStart()->getEdgesTo($edge->getVertexEnd())->getVector();
} else {
// edge points into both directions (undirected/bidirectional edge)
// also get all edges in other direction
$ends = $edge->getVertices();
$edges = $ends->getVertexFirst()->getEdges()->getEdgesIntersection($ends->getVertexLast()->getEdges())->getVector();
}
$pos = array_search($edge, $edges, true);
if ($pos === false) {
// @codeCoverageIgnoreStart
throw new LogicException('Internal error: Current edge not found');
// @codeCoverageIgnoreEnd
}
// exclude current edge from parallel edges
unset($edges[$pos]);
return new Edges(array_values($edges));
}
