BufferSubgraph.h

00001 /**********************************************************************
00002  *
00003  * GEOS - Geometry Engine Open Source
00004  * http://geos.osgeo.org
00005  *
00006  * Copyright (C) 2006 Refractions Research Inc.
00007  *
00008  * This is free software; you can redistribute and/or modify it under
00009  * the terms of the GNU Lesser General Public Licence as published
00010  * by the Free Software Foundation. 
00011  * See the COPYING file for more information.
00012  *
00013  **********************************************************************
00014  *
00015  * Last port: operation/buffer/BufferSubgraph.java r378 (JTS-1.12)
00016  *
00017  **********************************************************************/
00018 
00019 #ifndef GEOS_OP_BUFFER_BUFFERSUBGRAPH_H
00020 #define GEOS_OP_BUFFER_BUFFERSUBGRAPH_H
00021 
00022 #include <geos/export.h>
00023 
00024 #include <geos/operation/buffer/RightmostEdgeFinder.h> // for composition
00025 
00026 #include <vector>
00027 #include <set>
00028 
00029 #ifdef _MSC_VER
00030 #pragma warning(push)
00031 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
00032 #endif
00033 
00034 // Forward declarations
00035 namespace geos {
00036         namespace geom {
00037                 class Coordinate;
00038                 class Envelope;
00039         }
00040         namespace algorithm {
00041                 class CGAlgorithms;
00042         }
00043         namespace geomgraph {
00044                 class DirectedEdge;
00045                 class Node;
00046         }
00047 }
00048 
00049 namespace geos {
00050 namespace operation { // geos.operation
00051 namespace buffer { // geos.operation.buffer
00052 
00061 class GEOS_DLL BufferSubgraph {
00062 private:
00063         RightmostEdgeFinder finder;
00064 
00065         std::vector<geomgraph::DirectedEdge*> dirEdgeList;
00066 
00067         std::vector<geomgraph::Node*> nodes;
00068 
00069         geom::Coordinate *rightMostCoord;
00070 
00071         geom::Envelope *env;
00072 
00080         void addReachable(geomgraph::Node *startNode);
00081 
00083         //
00087         void add(geomgraph::Node* node, std::vector<geomgraph::Node*>* nodeStack);
00088 
00089         void clearVisitedEdges();
00090 
00097         // <FIX> MD - use iteration & queue rather than recursion, for speed and robustness
00098         void computeDepths(geomgraph::DirectedEdge *startEdge);
00099 
00100         void computeNodeDepth(geomgraph::Node *n);
00101 
00102         void copySymDepths(geomgraph::DirectedEdge *de);
00103 
00104         bool contains(std::set<geomgraph::Node*>& nodes, geomgraph::Node *node);
00105 
00106 public:
00107 
00108         friend std::ostream& operator<< (std::ostream& os, const BufferSubgraph& bs);
00109 
00110         BufferSubgraph(); 
00111 
00112         ~BufferSubgraph();
00113 
00114         std::vector<geomgraph::DirectedEdge*>* getDirectedEdges();
00115 
00116         std::vector<geomgraph::Node*>* getNodes();
00117 
00121         geom::Coordinate* getRightmostCoordinate();
00122 
00131         void create(geomgraph::Node *node);
00132 
00133         void computeDepth(int outsideDepth);
00134 
00146         void findResultEdges();
00147 
00162         int compareTo(BufferSubgraph *);
00163 
00170         geom::Envelope *getEnvelope();
00171 };
00172 
00173 std::ostream& operator<< (std::ostream& os, const BufferSubgraph& bs);
00174 
00175 // INLINES
00176 inline geom::Coordinate*
00177 BufferSubgraph::getRightmostCoordinate() {return rightMostCoord;}
00178 
00179 inline std::vector<geomgraph::Node*>*
00180 BufferSubgraph::getNodes() { return &nodes; }
00181 
00182 inline std::vector<geomgraph::DirectedEdge*>*
00183 BufferSubgraph::getDirectedEdges() {
00184         return &dirEdgeList;
00185 }
00186 
00187 bool BufferSubgraphGT(BufferSubgraph *first, BufferSubgraph *second);
00188 
00189 } // namespace geos::operation::buffer
00190 } // namespace geos::operation
00191 } // namespace geos
00192 
00193 #ifdef _MSC_VER
00194 #pragma warning(pop)
00195 #endif
00196 
00197 #endif // ndef GEOS_OP_BUFFER_BUFFERSUBGRAPH_H
00198 

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