ConvexHull.h

00001 /**********************************************************************
00002  *
00003  * GEOS - Geometry Engine Open Source
00004  * http://geos.osgeo.org
00005  *
00006  * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
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  * Last port: algorithm/ConvexHull.java r407 (JTS-1.12+)
00018  *
00019  **********************************************************************/
00020 
00021 #ifndef GEOS_ALGORITHM_CONVEXHULL_H
00022 #define GEOS_ALGORITHM_CONVEXHULL_H
00023 
00024 #include <geos/export.h>
00025 #include <vector>
00026 
00027 // FIXME: avoid using Cordinate:: typedefs to avoid full include
00028 #include <geos/geom/Coordinate.h>
00029 
00030 #ifdef _MSC_VER
00031 #pragma warning(push)
00032 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
00033 #endif
00034 
00035 // Forward declarations
00036 namespace geos {
00037         namespace geom {
00038                 class Geometry;
00039                 class GeometryFactory;
00040                 class CoordinateSequence;
00041         }
00042 }
00043 
00044 namespace geos {
00045 namespace algorithm { // geos::algorithm
00046 
00058 class GEOS_DLL ConvexHull {
00059 private:
00060         const geom::GeometryFactory *geomFactory;
00061         geom::Coordinate::ConstVect inputPts;
00062 
00063         void extractCoordinates(const geom::Geometry *geom);
00064 
00069         geom::CoordinateSequence *toCoordinateSequence(geom::Coordinate::ConstVect &cv);
00070 
00071         void computeOctPts(const geom::Coordinate::ConstVect &src,
00072                         geom::Coordinate::ConstVect &tgt);
00073 
00074         bool computeOctRing(const geom::Coordinate::ConstVect &src,
00075                         geom::Coordinate::ConstVect &tgt);
00076 
00101         void reduce(geom::Coordinate::ConstVect &pts);
00102 
00104         void padArray3(geom::Coordinate::ConstVect &pts);
00105 
00107         void preSort(geom::Coordinate::ConstVect &pts);
00108 
00126         int polarCompare(const geom::Coordinate &o,
00127                         const geom::Coordinate &p, const geom::Coordinate &q);
00128 
00129         void grahamScan(const geom::Coordinate::ConstVect &c,
00130                         geom::Coordinate::ConstVect &ps);
00131 
00141         geom::Geometry* lineOrPolygon(const geom::Coordinate::ConstVect &vertices);
00142 
00147         void cleanRing(const geom::Coordinate::ConstVect &input,
00148                         geom::Coordinate::ConstVect &cleaned);
00149 
00154         bool isBetween(const geom::Coordinate& c1, const geom::Coordinate& c2, const geom::Coordinate& c3);
00155 
00156 public:
00157 
00161         ConvexHull(const geom::Geometry *newGeometry);
00162 
00163 
00164         ~ConvexHull();
00165 
00178         geom::Geometry* getConvexHull();
00179 };
00180 
00181 } // namespace geos::algorithm
00182 } // namespace geos
00183 
00184 #ifdef _MSC_VER
00185 #pragma warning(pop)
00186 #endif
00187 
00188 #ifdef GEOS_INLINE
00189 # include "geos/algorithm/ConvexHull.inl"
00190 #endif
00191 
00192 #endif // GEOS_ALGORITHM_CONVEXHULL_H

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