GEOS  3.3.3
ConvexHull.h
1 /**********************************************************************
2  * $Id: ConvexHull.h 3255 2011-03-01 17:56:10Z mloskot $
3  *
4  * GEOS - Geometry Engine Open Source
5  * http://geos.refractions.net
6  *
7  * Copyright (C) 2005-2006 Refractions Research Inc.
8  * Copyright (C) 2001-2002 Vivid Solutions Inc.
9  *
10  * This is free software; you can redistribute and/or modify it under
11  * the terms of the GNU Lesser General Public Licence as published
12  * by the Free Software Foundation.
13  * See the COPYING file for more information.
14  *
15  **********************************************************************/
16 
17 #ifndef GEOS_ALGORITHM_CONVEXHULL_H
18 #define GEOS_ALGORITHM_CONVEXHULL_H
19 
20 #include <geos/export.h>
21 #include <vector>
22 
23 // FIXME: avoid using Cordinate:: typedefs to avoid full include
24 #include <geos/geom/Coordinate.h>
25 
26 #ifdef _MSC_VER
27 #pragma warning(push)
28 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
29 #endif
30 
31 // Forward declarations
32 namespace geos {
33  namespace geom {
34  class Geometry;
35  class GeometryFactory;
36  class CoordinateSequence;
37  }
38 }
39 
40 namespace geos {
41 namespace algorithm { // geos::algorithm
42 
54 class GEOS_DLL ConvexHull {
55 private:
56  const geom::GeometryFactory *geomFactory;
58 
59  void extractCoordinates(const geom::Geometry *geom);
60 
65  geom::CoordinateSequence *toCoordinateSequence(geom::Coordinate::ConstVect &cv);
66 
67  void computeOctPts(const geom::Coordinate::ConstVect &src,
69 
70  bool computeOctRing(const geom::Coordinate::ConstVect &src,
72 
95  void reduce(geom::Coordinate::ConstVect &pts);
96 
97 
99  void preSort(geom::Coordinate::ConstVect &pts);
100 
118  int polarCompare(const geom::Coordinate &o,
119  const geom::Coordinate &p, const geom::Coordinate &q);
120 
121  void grahamScan(const geom::Coordinate::ConstVect &c,
123 
133  geom::Geometry* lineOrPolygon(const geom::Coordinate::ConstVect &vertices);
134 
139  void cleanRing(const geom::Coordinate::ConstVect &input,
140  geom::Coordinate::ConstVect &cleaned);
141 
146  bool isBetween(const geom::Coordinate& c1, const geom::Coordinate& c2, const geom::Coordinate& c3);
147 
148 public:
149 
153  ConvexHull(const geom::Geometry *newGeometry);
154 
155 
156  ~ConvexHull();
157 
170  geom::Geometry* getConvexHull();
171 };
172 
173 } // namespace geos::algorithm
174 } // namespace geos
175 
176 #ifdef _MSC_VER
177 #pragma warning(pop)
178 #endif
179 
180 #ifdef GEOS_INLINE
181 # include "geos/algorithm/ConvexHull.inl"
182 #endif
183 
184 #endif // GEOS_ALGORITHM_CONVEXHULL_H
185 
186 /**********************************************************************
187  * $Log$
188  * Revision 1.2 2006/03/24 09:52:41 strk
189  * USE_INLINE => GEOS_INLINE
190  *
191  * Revision 1.1 2006/03/09 16:46:48 strk
192  * geos::geom namespace definition, first pass at headers split
193  *
194  **********************************************************************/
195