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# BufferSubgraph.h

    00001 /**********************************************************************
    00002  * $Id: BufferSubgraph.h 2559 2009-06-08 10:07:05Z strk $
    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  * Last port: operation/buffer/BufferSubgraph.java rev. 1.21 (JTS-1.10)
    00017  *
    00018  **********************************************************************/
    00019
    00020 #ifndef GEOS_OP_BUFFER_BUFFERSUBGRAPH_H
    00021 #define GEOS_OP_BUFFER_BUFFERSUBGRAPH_H
    00022
    00023 #include <geos/export.h>
    00024
    00025 #include <vector>
    00026 #include <set>
    00027
    00028 #include <geos/operation/buffer/RightmostEdgeFinder.h> // for composition
    00029
    00030 // Forward declarations
    00031 namespace geos {
    00032         namespace geom {
    00033                 class Coordinate;
    00034                 class Envelope;
    00035         }
    00036         namespace algorithm {
    00037                 class CGAlgorithms;
    00038         }
    00039         namespace geomgraph {
    00040                 class DirectedEdge;
    00041                 class Node;
    00042         }
    00043 }
    00044
    00045 namespace geos {
    00046 namespace operation { // geos.operation
    00047 namespace buffer { // geos.operation.buffer
    00048
    00057 class GEOS_DLL BufferSubgraph {
    00058 private:
    00059         RightmostEdgeFinder finder;
    00060
    00061         std::vector<geomgraph::DirectedEdge*> dirEdgeList;
    00062
    00063         std::vector<geomgraph::Node*> nodes;
    00064
    00065         geom::Coordinate *rightMostCoord;
    00066
    00067         geom::Envelope *env;
    00068
    00076         void addReachable(geomgraph::Node *startNode);
    00077
    00079         //
    00083         void add(geomgraph::Node* node, std::vector<geomgraph::Node*>* nodeStack);
    00084
    00085         void clearVisitedEdges();
    00086
    00093         // <FIX> MD - use iteration & queue rather than recursion, for speed and robustness
    00094         void computeDepths(geomgraph::DirectedEdge *startEdge);
    00095
    00096         void computeNodeDepth(geomgraph::Node *n);
    00097
    00098         void copySymDepths(geomgraph::DirectedEdge *de);
    00099
    00100         bool contains(std::set<geomgraph::Node*>& nodes, geomgraph::Node *node);
    00101
    00102 public:
    00103
    00104         friend std::ostream& operator<< (std::ostream& os, const BufferSubgraph& bs);
    00105
    00106         BufferSubgraph();
    00107
    00108         ~BufferSubgraph();
    00109
    00110         std::vector<geomgraph::DirectedEdge*>* getDirectedEdges();
    00111
    00112         std::vector<geomgraph::Node*>* getNodes();
    00113
    00117         geom::Coordinate* getRightmostCoordinate();
    00118
    00127         void create(geomgraph::Node *node);
    00128
    00129         void computeDepth(int outsideDepth);
    00130
    00142         void findResultEdges();
    00143
    00158         int compareTo(BufferSubgraph *);
    00159
    00166         geom::Envelope *getEnvelope();
    00167 };
    00168
    00169 std::ostream& operator<< (std::ostream& os, const BufferSubgraph& bs);
    00170
    00171 // INLINES
    00172 inline geom::Coordinate*
    00173 BufferSubgraph::getRightmostCoordinate() {return rightMostCoord;}
    00174
    00175 inline std::vector<geomgraph::Node*>*
    00176 BufferSubgraph::getNodes() { return &nodes; }
    00177
    00178 inline std::vector<geomgraph::DirectedEdge*>*
    00179 BufferSubgraph::getDirectedEdges() {
    00180         return &dirEdgeList;
    00181 }
    00182
    00183 bool BufferSubgraphGT(BufferSubgraph *first, BufferSubgraph *second);
    00184
    00185 } // namespace geos::operation::buffer
    00186 } // namespace geos::operation
    00187 } // namespace geos
    00188
    00189 #endif // ndef GEOS_OP_BUFFER_BUFFERSUBGRAPH_H
    00190
    00191 /**********************************************************************
    00192  * $Log$
    00193  * Revision 1.3  2006/03/15 11:45:06  strk
    00194  * doxygen comments
    00195  *
    00196  * Revision 1.2  2006/03/14 14:16:52  strk
    00197  * operator<< for BufferSubgraph, more debugging calls
    00198  *
    00199  * Revision 1.1  2006/03/14 00:19:40  strk
    00200  * opBuffer.h split, streamlined headers in some (not all) files in operation/buffer/
    00201  *
    00202  **********************************************************************/
    00203