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# ConvexHull.h

    00001 /**********************************************************************
    00002  * $Id: ConvexHull.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_ALGORITHM_CONVEXHULL_H
    00018 #define GEOS_ALGORITHM_CONVEXHULL_H
    00019
    00020 #include <geos/export.h>
    00021 #include <vector>
    00022
    00023 // FIXME: avoid using Cordinate:: typedefs to avoid full include
    00024 #include <geos/geom/Coordinate.h>
    00025
    00026 #ifdef _MSC_VER
    00027 #pragma warning(push)
    00028 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
    00029 #endif
    00030
    00031 // Forward declarations
    00032 namespace geos {
    00033         namespace geom {
    00034                 class Geometry;
    00035                 class GeometryFactory;
    00036                 class CoordinateSequence;
    00037         }
    00038 }
    00039
    00040 namespace geos {
    00041 namespace algorithm { // geos::algorithm
    00042
    00054 class GEOS_DLL ConvexHull {
    00055 private:
    00056         const geom::GeometryFactory *geomFactory;
    00057         geom::Coordinate::ConstVect inputPts;
    00058
    00059         void extractCoordinates(const geom::Geometry *geom);
    00060
    00065         geom::CoordinateSequence *toCoordinateSequence(geom::Coordinate::ConstVect &cv);
    00066
    00067         void computeOctPts(const geom::Coordinate::ConstVect &src,
    00068                         geom::Coordinate::ConstVect &tgt);
    00069
    00070         bool computeOctRing(const geom::Coordinate::ConstVect &src,
    00071                         geom::Coordinate::ConstVect &tgt);
    00072
    00095         void reduce(geom::Coordinate::ConstVect &pts);
    00096
    00097
    00099         void preSort(geom::Coordinate::ConstVect &pts);
    00100
    00118         int polarCompare(const geom::Coordinate &o,
    00119                         const geom::Coordinate &p, const geom::Coordinate &q);
    00120
    00121         void grahamScan(const geom::Coordinate::ConstVect &c,
    00122                         geom::Coordinate::ConstVect &ps);
    00123
    00133         geom::Geometry* lineOrPolygon(const geom::Coordinate::ConstVect &vertices);
    00134
    00139         void cleanRing(const geom::Coordinate::ConstVect &input,
    00140                         geom::Coordinate::ConstVect &cleaned);
    00141
    00146         bool isBetween(const geom::Coordinate& c1, const geom::Coordinate& c2, const geom::Coordinate& c3);
    00147
    00148 public:
    00149
    00153         ConvexHull(const geom::Geometry *newGeometry);
    00154
    00155
    00156         ~ConvexHull();
    00157
    00170         geom::Geometry* getConvexHull();
    00171 };
    00172
    00173 } // namespace geos::algorithm
    00174 } // namespace geos
    00175
    00176 #ifdef _MSC_VER
    00177 #pragma warning(pop)
    00178 #endif
    00179
    00180 #ifdef GEOS_INLINE
    00181 # include "geos/algorithm/ConvexHull.inl"
    00182 #endif
    00183
    00184 #endif // GEOS_ALGORITHM_CONVEXHULL_H
    00185
    00186 /**********************************************************************
    00187  * $Log$
    00188  * Revision 1.2  2006/03/24 09:52:41  strk
    00189  * USE_INLINE => GEOS_INLINE
    00190  *
    00191  * Revision 1.1  2006/03/09 16:46:48  strk
    00192  * geos::geom namespace definition, first pass at headers split
    00193  *
    00194  **********************************************************************/
    00195