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# ConvexHull.h

    00001 /**********************************************************************
    00002  * $Id: ConvexHull.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_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 // Forward declarations
    00027 namespace geos {
    00028         namespace geom {
    00029                 class Geometry;
    00030                 class GeometryFactory;
    00031                 class CoordinateSequence;
    00032         }
    00033 }
    00034
    00035 namespace geos {
    00036 namespace algorithm { // geos::algorithm
    00037
    00049 class GEOS_DLL ConvexHull {
    00050 private:
    00051         const geom::GeometryFactory *geomFactory;
    00052         geom::Coordinate::ConstVect inputPts;
    00053
    00054         void extractCoordinates(const geom::Geometry *geom);
    00055
    00060         geom::CoordinateSequence *toCoordinateSequence(geom::Coordinate::ConstVect &cv);
    00061
    00062         void computeOctPts(const geom::Coordinate::ConstVect &src,
    00063                         geom::Coordinate::ConstVect &tgt);
    00064
    00065         bool computeOctRing(const geom::Coordinate::ConstVect &src,
    00066                         geom::Coordinate::ConstVect &tgt);
    00067
    00090         void reduce(geom::Coordinate::ConstVect &pts);
    00091
    00092
    00094         void preSort(geom::Coordinate::ConstVect &pts);
    00095
    00113         int polarCompare(const geom::Coordinate &o,
    00114                         const geom::Coordinate &p, const geom::Coordinate &q);
    00115
    00116         void grahamScan(const geom::Coordinate::ConstVect &c,
    00117                         geom::Coordinate::ConstVect &ps);
    00118
    00128         geom::Geometry* lineOrPolygon(const geom::Coordinate::ConstVect &vertices);
    00129
    00134         void cleanRing(const geom::Coordinate::ConstVect &input,
    00135                         geom::Coordinate::ConstVect &cleaned);
    00136
    00141         bool isBetween(const geom::Coordinate& c1, const geom::Coordinate& c2, const geom::Coordinate& c3);
    00142
    00143 public:
    00144
    00148         ConvexHull(const geom::Geometry *newGeometry);
    00149
    00150
    00151         ~ConvexHull();
    00152
    00165         geom::Geometry* getConvexHull();
    00166 };
    00167
    00168 } // namespace geos::algorithm
    00169 } // namespace geos
    00170
    00171 #ifdef GEOS_INLINE
    00172 # include "geos/algorithm/ConvexHull.inl"
    00173 #endif
    00174
    00175 #endif // GEOS_ALGORITHM_CONVEXHULL_H
    00176
    00177 /**********************************************************************
    00178  * $Log$
    00179  * Revision 1.2  2006/03/24 09:52:41  strk
    00180  * USE_INLINE => GEOS_INLINE
    00181  *
    00182  * Revision 1.1  2006/03/09 16:46:48  strk
    00183  * geos::geom namespace definition, first pass at headers split
    00184  *
    00185  **********************************************************************/
    00186