/********************************************************************** * $Id: Edge.h 1820 2006-09-06 16:54:23Z mloskot $ * * GEOS - Geometry Engine Open Source * http://geos.refractions.net * * Copyright (C) 2001-2002 Vivid Solutions Inc. * Copyright (C) 2005-2006 Refractions Research Inc. * * This is free software; you can redistribute and/or modify it under * the terms of the GNU Lesser General Public Licence as published * by the Free Software Foundation.  * See the COPYING file for more information. * **********************************************************************/#ifndef GEOS_PLANARGRAPH_EDGE_H#define GEOS_PLANARGRAPH_EDGE_H#include <geos/planargraph/GraphComponent.h> // for inheritance#include <vector> // for typedefs#include <set> // for typedefs#include <iosfwd> // ostream// Forward declarationsnamespace geos {	namespace planargraph { 		class DirectedEdgeStar;		class DirectedEdge;		class Edge;		class Node;	}}namespace geos {namespace planargraph { // geos.planargraph/** * \brief Represents an undirected edge of a PlanarGraph. * * An undirected edge in fact simply acts as a central point of reference * for two opposite DirectedEdge. *  * Usually a client using a PlanarGraph will subclass Edge * to add its own application-specific data and methods. */class Edge: public GraphComponent {public:	friend std::ostream& operator<< (std::ostream& os, const Node&);	/// Set of const Edges pointers	typedef std::set<const Edge *> ConstSet;	/// Set of non-const Edges pointers	typedef std::set<Edge *> NonConstSet;	/// Vector of non-const Edges pointers	typedef std::vector<Edge *> NonConstVect;	/// Vector of const Edges pointers	typedef std::vector<const Edge *> ConstVect;protected:	/** \brief The two DirectedEdges associated with this Edge */	std::vector<DirectedEdge*> dirEdge;	/**	 * \brief Constructs an Edge whose DirectedEdges are not yet set.	 *	 * Be sure to call setDirectedEdges(DirectedEdge, DirectedEdge)	 */public:	/** \brief	 * Constructs a Edge whose DirectedEdges are	 * not yet set.	 *	 * Be sure to call	 * {@link setDirectedEdges(DirectedEdge, DirectedEdge)}	 */	Edge(): dirEdge() {}	/**	 * \brief Constructs an Edge initialized with the given DirectedEdges.	 *	 * For  each DirectedEdge: sets the Edge, sets the symmetric	 * DirectedEdge, and adds this Edge to its from-Node.	 */	Edge(DirectedEdge *de0, DirectedEdge *de1)		:		dirEdge()	{		setDirectedEdges(de0, de1);	}	/**	 * \brief Initializes this Edge's two DirectedEdges.	 *	 * For each DirectedEdge:	 *  sets the Edge, sets the symmetric DirectedEdge, and	 *  adds this Edge to its from-Node.	 */	void setDirectedEdges(DirectedEdge *de0, DirectedEdge *de1);	/**	 * \brief Returns one of the DirectedEdges associated with this Edge.	 * @param i 0 or 1	 */	DirectedEdge* getDirEdge(int i);	/**	 * \brief Returns the DirectedEdge that starts from the given node,	 * or null if the node is not one of the two nodes associated	 * with this Edge.	 */	DirectedEdge* getDirEdge(Node *fromNode);	/**	 * \brief If <code>node</code> is one of the two nodes associated	 * with this Edge, returns the other node; otherwise returns null.	 */	Node* getOppositeNode(Node *node);};/// Print a Edgestd::ostream& operator<<(std::ostream& os, const Edge& n); /// For backward compatibility//typedef Edge planarEdge;} // namespace geos::planargraph} // namespace geos#endif // GEOS_PLANARGRAPH_EDGE_H/********************************************************************** * $Log$ * Revision 1.1  2006/03/21 21:42:54  strk * planargraph.h header split, planargraph:: classes renamed to match JTS symbols * **********************************************************************/