SharedPathsOp.h

00001 /**********************************************************************
00002  * $Id$
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2010      Sandro Santilli <strk@keybit.net>
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: original work
00017  *
00018  * Developed by Sandro Santilli (strk@keybit.net)
00019  * for Faunalia (http://www.faunalia.it)
00020  * with funding from Regione Toscana - Settore SISTEMA INFORMATIVO
00021  * TERRITORIALE ED AMBIENTALE - for the project: "Sviluppo strumenti
00022  * software per il trattamento di dati geografici basati su QuantumGIS
00023  * e Postgis (CIG 0494241492)"
00024  *
00025  **********************************************************************/
00026 
00027 #ifndef GEOS_OPERATION_SHAREDPATHSOP_H
00028 #define GEOS_OPERATION_SHAREDPATHSOP_H
00029 
00030 #include <geos/export.h> // for GEOS_DLL
00031 
00032 #include <vector> 
00033 
00034 // Forward declarations
00035 namespace geos {
00036   namespace geom {
00037     class LineString;
00038     class Geometry;
00039     class GeometryFactory;
00040   }
00041 }
00042 
00043 
00044 namespace geos {
00045 namespace operation { // geos.operation
00046 namespace sharedpaths { // geos.operation.sharedpaths
00047 
00065 class GEOS_DLL SharedPathsOp
00066 {
00067 public:
00068 
00070   typedef std::vector<geom::LineString*> PathList;
00071 
00073   //
00090   static void sharedPathsOp(const geom::Geometry& g1,
00091                             const geom::Geometry& g2,
00092                             PathList& sameDirection,
00093                             PathList& oppositeDirection);
00094 
00096   //
00103   SharedPathsOp(const geom::Geometry& g1, const geom::Geometry& g2);
00104 
00106   //
00117   void getSharedPaths(PathList& sameDirection, PathList& oppositeDirection);
00118 
00120   static void clearEdges(PathList& from);
00121 
00122 private:
00123 
00125   //
00130   void findLinearIntersections(PathList& to);
00131 
00133   //
00136   bool isForward(const geom::LineString& edge,
00137                  const geom::Geometry& geom);
00138 
00141   bool isSameDirection(const geom::LineString& edge) {
00142     return (isForward(edge, _g1) == isForward(edge, _g2));
00143   }
00144 
00146   void checkLinealInput(const geom::Geometry& g);
00147 
00148   const geom::Geometry& _g1;
00149   const geom::Geometry& _g2;
00150   const geom::GeometryFactory& _gf;
00151 
00152   // Declare type as noncopyable
00153   SharedPathsOp(const SharedPathsOp& other);
00154   SharedPathsOp& operator=(const SharedPathsOp& rhs);
00155 
00156 };
00157 
00158 } // namespace geos.operation.sharedpaths
00159 } // namespace geos.operation
00160 } // namespace geos
00161 
00162 #endif
00163 

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