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# 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