MonotoneChainEdge.h

00001 /**********************************************************************
00002  * $Id: MonotoneChainEdge.h 1820 2006-09-06 16:54:23Z mloskot $
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 #include <geos/geom/Envelope.h> // for composition
00021 
00022 // Forward declarations
00023 namespace geos {
00024         namespace geom {
00025                 class CoordinateSequence;
00026         }
00027         namespace geomgraph {
00028                 class Edge;
00029                 namespace index {
00030                         class SegmentIntersector;
00031                 }
00032         }
00033 }
00034 
00035 namespace geos {
00036 namespace geomgraph { // geos::geomgraph
00037 namespace index { // geos::geomgraph::index
00038 
00039 class MonotoneChainEdge {
00040 public:
00041         //MonotoneChainEdge();
00042         ~MonotoneChainEdge();
00043         MonotoneChainEdge(Edge *newE);
00044         const geom::CoordinateSequence* getCoordinates();
00045         std::vector<int>& getStartIndexes();
00046         double getMinX(int chainIndex);
00047         double getMaxX(int chainIndex);
00048 
00049         void computeIntersects(const MonotoneChainEdge &mce,
00050                 SegmentIntersector &si);
00051 
00052         void computeIntersectsForChain(int chainIndex0,
00053                 const MonotoneChainEdge &mce, int chainIndex1,
00054                 SegmentIntersector &si);
00055 
00056 protected:
00057         Edge *e;
00058         const geom::CoordinateSequence* pts; // cache a reference to the coord array, for efficiency
00059         // the lists of start/end indexes of the monotone chains.
00060         // Includes the end point of the edge as a sentinel
00061         std::vector<int> startIndex;
00062         // these envelopes are created once and reused
00063         geom::Envelope env1;
00064         geom::Envelope env2;
00065 private:
00066         void computeIntersectsForChain(int start0, int end0,
00067                 const MonotoneChainEdge &mce,
00068                 int start1, int end1,
00069                 SegmentIntersector &ei);
00070 };
00071 
00072 
00073 
00074 } // namespace geos.geomgraph.index
00075 } // namespace geos.geomgraph
00076 } // namespace geos
00077 
00078 #endif
00079 
00080 /**********************************************************************
00081  * $Log$
00082  * Revision 1.1  2006/03/14 12:55:55  strk
00083  * Headers split: geomgraphindex.h, nodingSnapround.h
00084  *
00085  **********************************************************************/
00086 

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