SimpleMCSweepLineIntersector.h

00001 /**********************************************************************
00002  *
00003  * GEOS - Geometry Engine Open Source
00004  * http://geos.osgeo.org
00005  *
00006  * Copyright (C) 2005-2006 Refractions Research Inc.
00007  * Copyright (C) 2001-2002 Vivid Solutions 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_GEOMGRAPH_INDEX_SIMPLEMCSWEEPLINEINTERSECTOR_H
00017 #define GEOS_GEOMGRAPH_INDEX_SIMPLEMCSWEEPLINEINTERSECTOR_H
00018 
00019 #include <geos/export.h>
00020 #include <vector>
00021 
00022 #include <geos/geomgraph/index/EdgeSetIntersector.h> // for inheritance
00023 
00024 #ifdef _MSC_VER
00025 #pragma warning(push)
00026 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
00027 #endif
00028 
00029 // Forward declarations
00030 namespace geos {
00031         namespace geomgraph {
00032                 class Edge;
00033                 namespace index {
00034                         class SegmentIntersector;
00035                         class SweepLineEvent;
00036                 }
00037         }
00038 }
00039 
00040 namespace geos {
00041 namespace geomgraph { // geos::geomgraph
00042 namespace index { // geos::geomgraph::index
00043 
00053 class GEOS_DLL SimpleMCSweepLineIntersector: public EdgeSetIntersector {
00054 
00055 public:
00056 
00057         SimpleMCSweepLineIntersector();
00058 
00059         virtual ~SimpleMCSweepLineIntersector();
00060 
00061         void computeIntersections(std::vector<Edge*> *edges,
00062                         SegmentIntersector *si, bool testAllSegments);
00063 
00064         void computeIntersections(std::vector<Edge*> *edges0,
00065                         std::vector<Edge*> *edges1,
00066                         SegmentIntersector *si);
00067 
00068 protected:
00069 
00070         std::vector<SweepLineEvent*> events;
00071 
00072         // statistics information
00073         int nOverlaps;
00074 
00075 private:
00076         void add(std::vector<Edge*> *edges);
00077 
00078         void add(std::vector<Edge*> *edges,void* edgeSet);
00079 
00080         void add(Edge *edge,void* edgeSet);
00081 
00082         void prepareEvents();
00083 
00084         void computeIntersections(SegmentIntersector *si);
00085 
00086         void processOverlaps(int start, int end,
00087                         SweepLineEvent *ev0,
00088                         SegmentIntersector *si);
00089 };
00090 
00091 } // namespace geos.geomgraph.index
00092 } // namespace geos.geomgraph
00093 } // namespace geos
00094 
00095 #ifdef _MSC_VER
00096 #pragma warning(pop)
00097 #endif
00098 
00099 #endif // GEOS_GEOMGRAPH_INDEX_SIMPLEMCSWEEPLINEINTERSECTOR_H
00100 

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