• Main Page
  • Related Pages
  • Namespaces
  • Classes
  • Files
  • File List

MonotoneChainEdge.h

00001 /**********************************************************************
00002  * $Id: MonotoneChainEdge.h 2556 2009-06-06 22:22:28Z strk $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2005-2006 Refractions Research Inc.
00008  * Copyright (C) 2001-2002 Vivid Solutions Inc.
00009  *
00010  * This is free software; you can redistribute and/or modify it under
00011  * the terms of the GNU Lesser General Public Licence as published
00012  * by the Free Software Foundation. 
00013  * See the COPYING file for more information.
00014  *
00015  **********************************************************************/
00016 
00017 #ifndef GEOS_GEOMGRAPH_INDEX_MONOTONECHAINEDGE_H
00018 #define GEOS_GEOMGRAPH_INDEX_MONOTONECHAINEDGE_H
00019 
00020 
00021 #include <geos/export.h>
00022 #include <geos/geom/Envelope.h> // for composition
00023 
00024 // Forward declarations
00025 namespace geos {
00026         namespace geom {
00027                 class CoordinateSequence;
00028         }
00029         namespace geomgraph {
00030                 class Edge;
00031                 namespace index {
00032                         class SegmentIntersector;
00033                 }
00034         }
00035 }
00036 
00037 namespace geos {
00038 namespace geomgraph { // geos::geomgraph
00039 namespace index { // geos::geomgraph::index
00040 
00041 class GEOS_DLL MonotoneChainEdge {
00042 public:
00043         //MonotoneChainEdge();
00044         ~MonotoneChainEdge();
00045         MonotoneChainEdge(Edge *newE);
00046         const geom::CoordinateSequence* getCoordinates();
00047         std::vector<int>& getStartIndexes();
00048         double getMinX(int chainIndex);
00049         double getMaxX(int chainIndex);
00050 
00051         void computeIntersects(const MonotoneChainEdge &mce,
00052                 SegmentIntersector &si);
00053 
00054         void computeIntersectsForChain(int chainIndex0,
00055                 const MonotoneChainEdge &mce, int chainIndex1,
00056                 SegmentIntersector &si);
00057 
00058 protected:
00059         Edge *e;
00060         const geom::CoordinateSequence* pts; // cache a reference to the coord array, for efficiency
00061         // the lists of start/end indexes of the monotone chains.
00062         // Includes the end point of the edge as a sentinel
00063         std::vector<int> startIndex;
00064         // these envelopes are created once and reused
00065         geom::Envelope env1;
00066         geom::Envelope env2;
00067 private:
00068         void computeIntersectsForChain(int start0, int end0,
00069                 const MonotoneChainEdge &mce,
00070                 int start1, int end1,
00071                 SegmentIntersector &ei);
00072 };
00073 
00074 
00075 
00076 } // namespace geos.geomgraph.index
00077 } // namespace geos.geomgraph
00078 } // namespace geos
00079 
00080 #endif
00081 
00082 /**********************************************************************
00083  * $Log$
00084  * Revision 1.1  2006/03/14 12:55:55  strk
00085  * Headers split: geomgraphindex.h, nodingSnapround.h
00086  *
00087  **********************************************************************/
00088 

Generated on Thu Jul 22 2010 for GEOS by  doxygen 1.7.1