MonotoneChainEdge.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_MONOTONECHAINEDGE_H
00017 #define GEOS_GEOMGRAPH_INDEX_MONOTONECHAINEDGE_H
00018 
00019 #include <geos/export.h>
00020 #include <geos/geom/Envelope.h> // for composition
00021 
00022 #ifdef _MSC_VER
00023 #pragma warning(push)
00024 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
00025 #endif
00026 
00027 // Forward declarations
00028 namespace geos {
00029         namespace geom {
00030                 class CoordinateSequence;
00031         }
00032         namespace geomgraph {
00033                 class Edge;
00034                 namespace index {
00035                         class SegmentIntersector;
00036                 }
00037         }
00038 }
00039 
00040 namespace geos {
00041 namespace geomgraph { // geos::geomgraph
00042 namespace index { // geos::geomgraph::index
00043 
00044 class GEOS_DLL MonotoneChainEdge {
00045 public:
00046         //MonotoneChainEdge();
00047         ~MonotoneChainEdge();
00048         MonotoneChainEdge(Edge *newE);
00049         const geom::CoordinateSequence* getCoordinates();
00050         std::vector<int>& getStartIndexes();
00051         double getMinX(int chainIndex);
00052         double getMaxX(int chainIndex);
00053 
00054         void computeIntersects(const MonotoneChainEdge &mce,
00055                 SegmentIntersector &si);
00056 
00057         void computeIntersectsForChain(int chainIndex0,
00058                 const MonotoneChainEdge &mce, int chainIndex1,
00059                 SegmentIntersector &si);
00060 
00061 protected:
00062         Edge *e;
00063         const geom::CoordinateSequence* pts; // cache a reference to the coord array, for efficiency
00064         // the lists of start/end indexes of the monotone chains.
00065         // Includes the end point of the edge as a sentinel
00066         std::vector<int> startIndex;
00067         // these envelopes are created once and reused
00068         geom::Envelope env1;
00069         geom::Envelope env2;
00070 private:
00071         void computeIntersectsForChain(int start0, int end0,
00072                 const MonotoneChainEdge &mce,
00073                 int start1, int end1,
00074                 SegmentIntersector &ei);
00075 };
00076 
00077 } // namespace geos.geomgraph.index
00078 } // namespace geos.geomgraph
00079 } // namespace geos
00080 
00081 #ifdef _MSC_VER
00082 #pragma warning(pop)
00083 #endif
00084 
00085 #endif
00086 

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