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# MCIndexSegmentSetMutualIntersector.h

    00001 /**********************************************************************
    00002  *
    00003  * GEOS - Geometry Engine Open Source
    00004  * http://geos.refractions.net
    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  *
    00016  * Last port: noding/MCIndexSegmentSetMutualIntersector.java r388 (JTS-1.12)
    00017  *
    00018  **********************************************************************/
    00019
    00020 #ifndef GEOS_NODING_MCINDEXSEGMENTSETMUTUALINTERSECTOR_H
    00021 #define GEOS_NODING_MCINDEXSEGMENTSETMUTUALINTERSECTOR_H
    00022
    00023 #include <geos/noding/SegmentSetMutualIntersector.h> // inherited
    00024 #include <geos/index/chain/MonotoneChainOverlapAction.h> // inherited
    00025
    00026 namespace geos {
    00027         namespace index {
    00028                 class SpatialIndex;
    00029
    00030                 namespace chain {
    00031                         class MonotoneChain;
    00032                 }
    00033                 namespace strtree {
    00034                         //class STRtree;
    00035                 }
    00036         }
    00037         namespace noding {
    00038                 class SegmentString;
    00039                 class SegmentIntersector;
    00040         }
    00041 }
    00042
    00043 //using namespace geos::index::strtree;
    00044
    00045 namespace geos {
    00046 namespace noding { // geos::noding
    00047
    00054 class MCIndexSegmentSetMutualIntersector : public SegmentSetMutualIntersector
    00055 {
    00056 public:
    00057
    00058         MCIndexSegmentSetMutualIntersector();
    00059
    00060         ~MCIndexSegmentSetMutualIntersector();
    00061
    00062         /* Returns a reference to a vector of MonotoneChain objects owned
    00063          * by this class and destroyed on next call to ::process.
    00064          * Copy them if you need them alive for longer.
    00065          */
    00066         std::vector<index::chain::MonotoneChain *>& getMonotoneChains()
    00067         {
    00068                 return monoChains;
    00069         }
    00070
    00071         index::SpatialIndex* getIndex()
    00072         {
    00073                 return index;
    00074         }
    00075
    00076         void setBaseSegments(SegmentString::ConstVect* segStrings);
    00077
    00078         // NOTE: re-populates the MonotoneChain vector with newly created chains
    00079         void process(SegmentString::ConstVect* segStrings);
    00080
    00081     class SegmentOverlapAction : public index::chain::MonotoneChainOverlapAction
    00082     {
    00083     private:
    00084         SegmentIntersector & si;
    00085
    00086         // Declare type as noncopyable
    00087         SegmentOverlapAction(const SegmentOverlapAction& other);
    00088         SegmentOverlapAction& operator=(const SegmentOverlapAction& rhs);
    00089
    00090     public:
    00091         SegmentOverlapAction(SegmentIntersector & si) :
    00092           index::chain::MonotoneChainOverlapAction(), si(si)
    00093           {}
    00094
    00095           void overlap(index::chain::MonotoneChain& mc1, std::size_t start1,
    00096               index::chain::MonotoneChain& mc2, std::size_t start2);
    00097     };
    00098
    00099 private:
    00100
    00101         typedef std::vector<index::chain::MonotoneChain *> MonoChains;
    00102         MonoChains monoChains;
    00103
    00104         /*
    00105          * The {@link SpatialIndex} used should be something that supports
    00106          * envelope (range) queries efficiently (such as a {@link Quadtree}
    00107          * or {@link STRtree}.
    00108          */
    00109         index::SpatialIndex * index;
    00110         int indexCounter;
    00111         int processCounter;
    00112         // statistics
    00113         int nOverlaps;
    00114
    00115         /* memory management helper, holds MonotoneChain objects used
    00116          * in the SpatialIndex. It's cleared when the SpatialIndex is
    00117          */
    00118         MonoChains chainStore;
    00119
    00120         void addToIndex( SegmentString * segStr);
    00121
    00122         void intersectChains();
    00123
    00124         void addToMonoChains( SegmentString * segStr);
    00125
    00126 };
    00127
    00128 } // namespace geos::noding
    00129 } // namespace geos
    00130
    00131 #endif // GEOS_NODING_MCINDEXSEGMENTSETMUTUALINTERSECTOR_H
    00132 /**********************************************************************
    00133  * $Log$
    00134  **********************************************************************/
    00135