# BufferSubgraph.h

    00001 /**********************************************************************
    00002  * $Id: BufferSubgraph.h 1820 2006-09-06 16:54:23Z mloskot $
    00003  *
    00004  * GEOS - Geometry Engine Open Source
    00005  * http://geos.refractions.net
    00006  *
    00007  * Copyright (C) 2006 Refractions Research Inc.
    00008  *
    00009  * This is free software; you can redistribute and/or modify it under
    00010  * the terms of the GNU Lesser General Public Licence as published
    00011  * by the Free Software Foundation.
    00012  * See the COPYING file for more information.
    00013  *
    00014  **********************************************************************/
    00015
    00016 #ifndef GEOS_OP_BUFFER_BUFFERSUBGRAPH_H
    00017 #define GEOS_OP_BUFFER_BUFFERSUBGRAPH_H
    00018
    00019 #include <vector>
    00020 #include <set>
    00021
    00022 #include <geos/operation/buffer/RightmostEdgeFinder.h> // for composition
    00023
    00024 // Forward declarations
    00025 namespace geos {
    00026         namespace geom {
    00027                 class Coordinate;
    00028                 class Envelope;
    00029         }
    00030         namespace algorithm {
    00031                 class CGAlgorithms;
    00032         }
    00033         namespace geomgraph {
    00034                 class DirectedEdge;
    00035                 class Node;
    00036         }
    00037 }
    00038
    00039 namespace geos {
    00040 namespace operation { // geos.operation
    00041 namespace buffer { // geos.operation.buffer
    00042
    00050 class BufferSubgraph {
    00051 private:
    00052         RightmostEdgeFinder finder;
    00053
    00054         std::vector<geomgraph::DirectedEdge*> dirEdgeList;
    00055
    00056         std::vector<geomgraph::Node*> nodes;
    00057
    00058         geom::Coordinate *rightMostCoord;
    00059
    00060         geom::Envelope *env;
    00061
    00069         void addReachable(geomgraph::Node *startNode);
    00070
    00072         //
    00076         void add(geomgraph::Node* node, std::vector<geomgraph::Node*>* nodeStack);
    00077
    00078         void clearVisitedEdges();
    00079
    00086         // <FIX> MD - use iteration & queue rather than recursion, for speed and robustness
    00087         void computeDepths(geomgraph::DirectedEdge *startEdge);
    00088
    00089         void computeNodeDepth(geomgraph::Node *n);
    00090
    00091         void copySymDepths(geomgraph::DirectedEdge *de);
    00092
    00093         bool contains(std::set<geomgraph::Node*>& nodes, geomgraph::Node *node);
    00094
    00095 public:
    00096
    00097         friend std::ostream& operator<< (std::ostream& os, const BufferSubgraph& bs);
    00098
    00103         BufferSubgraph(algorithm::CGAlgorithms *cga=NULL);
    00104
    00105         ~BufferSubgraph();
    00106
    00107         std::vector<geomgraph::DirectedEdge*>* getDirectedEdges();
    00108
    00109         std::vector<geomgraph::Node*>* getNodes();
    00110
    00114         geom::Coordinate* getRightmostCoordinate();
    00115
    00124         void create(geomgraph::Node *node);
    00125
    00126         void computeDepth(int outsideDepth);
    00127
    00139         void findResultEdges();
    00140
    00155         int compareTo(BufferSubgraph *);
    00156
    00163         geom::Envelope *getEnvelope();
    00164 };
    00165
    00166 std::ostream& operator<< (std::ostream& os, const BufferSubgraph& bs);
    00167
    00168 // INLINES
    00169 inline geom::Coordinate*
    00170 BufferSubgraph::getRightmostCoordinate() {return rightMostCoord;}
    00171
    00172 inline std::vector<geomgraph::Node*>*
    00173 BufferSubgraph::getNodes() { return &nodes; }
    00174
    00175 inline std::vector<geomgraph::DirectedEdge*>*
    00176 BufferSubgraph::getDirectedEdges() {
    00177         return &dirEdgeList;
    00178 }
    00179
    00180 bool BufferSubgraphGT(BufferSubgraph *first, BufferSubgraph *second);
    00181
    00182 } // namespace geos::operation::buffer
    00183 } // namespace geos::operation
    00184 } // namespace geos
    00185
    00186 #endif // ndef GEOS_OP_BUFFER_BUFFERSUBGRAPH_H
    00187
    00188 /**********************************************************************
    00189  * $Log$
    00190  * Revision 1.3  2006/03/15 11:45:06  strk
    00191  * doxygen comments
    00192  *
    00193  * Revision 1.2  2006/03/14 14:16:52  strk
    00194  * operator<< for BufferSubgraph, more debugging calls
    00195  *
    00196  * Revision 1.1  2006/03/14 00:19:40  strk
    00197  * opBuffer.h split, streamlined headers in some (not all) files in operation/buffer/
    00198  *
    00199  **********************************************************************/
    00200