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# MonotoneChainEdge.h

    00001 /**********************************************************************
    00002  * $Id: MonotoneChainEdge.h 3255 2011-03-01 17:56:10Z 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/export.h>
    00021 #include <geos/geom/Envelope.h> // for composition
    00022
    00023 #ifdef _MSC_VER
    00024 #pragma warning(push)
    00025 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
    00026 #endif
    00027
    00028 // Forward declarations
    00029 namespace geos {
    00030         namespace geom {
    00031                 class CoordinateSequence;
    00032         }
    00033         namespace geomgraph {
    00034                 class Edge;
    00035                 namespace index {
    00036                         class SegmentIntersector;
    00037                 }
    00038         }
    00039 }
    00040
    00041 namespace geos {
    00042 namespace geomgraph { // geos::geomgraph
    00043 namespace index { // geos::geomgraph::index
    00044
    00045 class GEOS_DLL MonotoneChainEdge {
    00046 public:
    00047         //MonotoneChainEdge();
    00048         ~MonotoneChainEdge();
    00049         MonotoneChainEdge(Edge *newE);
    00050         const geom::CoordinateSequence* getCoordinates();
    00051         std::vector<int>& getStartIndexes();
    00052         double getMinX(int chainIndex);
    00053         double getMaxX(int chainIndex);
    00054
    00055         void computeIntersects(const MonotoneChainEdge &mce,
    00056                 SegmentIntersector &si);
    00057
    00058         void computeIntersectsForChain(int chainIndex0,
    00059                 const MonotoneChainEdge &mce, int chainIndex1,
    00060                 SegmentIntersector &si);
    00061
    00062 protected:
    00063         Edge *e;
    00064         const geom::CoordinateSequence* pts; // cache a reference to the coord array, for efficiency
    00065         // the lists of start/end indexes of the monotone chains.
    00066         // Includes the end point of the edge as a sentinel
    00067         std::vector<int> startIndex;
    00068         // these envelopes are created once and reused
    00069         geom::Envelope env1;
    00070         geom::Envelope env2;
    00071 private:
    00072         void computeIntersectsForChain(int start0, int end0,
    00073                 const MonotoneChainEdge &mce,
    00074                 int start1, int end1,
    00075                 SegmentIntersector &ei);
    00076 };
    00077
    00078 } // namespace geos.geomgraph.index
    00079 } // namespace geos.geomgraph
    00080 } // namespace geos
    00081
    00082 #ifdef _MSC_VER
    00083 #pragma warning(pop)
    00084 #endif
    00085
    00086 #endif
    00087
    00088 /**********************************************************************
    00089  * $Log$
    00090  * Revision 1.1  2006/03/14 12:55:55  strk
    00091  * Headers split: geomgraphindex.h, nodingSnapround.h
    00092  *
    00093  **********************************************************************/
    00094