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Quadrant.h
1 /**********************************************************************
2 * $Id: Quadrant.h 2557 2009-06-08 09:30:55Z strk $
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 * Last port: geomgraph/Quadrant.java rev. 1.8 (JTS-1.10)
18 *
19 **********************************************************************/
20
21
22 #ifndef GEOS_GEOMGRAPH_QUADRANT_H
23 #define GEOS_GEOMGRAPH_QUADRANT_H
24
25 #include <geos/export.h>
26 #include <string>
27
28 #include <geos/inline.h>
29
30 // Forward declarations
31 namespace geos {
32 namespace geom {
33 class Coordinate;
34 }
35 }
36
37 namespace geos {
38 namespace geomgraph { // geos.geomgraph
39
49 class GEOS_DLL Quadrant {
50
51 public:
52
53 static const int NE = 0;
54 static const int NW = 1;
55 static const int SW = 2;
56 static const int SE = 3;
57
64 static int quadrant(double dx, double dy);
65
71 static int quadrant(const geom::Coordinate& p0,
72 const geom::Coordinate& p1);
73
77 static bool isOpposite(int quad1, int quad2);
78
79 /*
80 * Returns the right-hand quadrant of the halfplane defined by
81 * the two quadrants,
82 * or -1 if the quadrants are opposite, or the quadrant if they
83 * are identical.
84 */
85 static int commonHalfPlane(int quad1, int quad2);
86
91 static bool isInHalfPlane(int quad, int halfPlane);
92
96 static bool isNorthern(int quad);
97 };
98
99
100 } // namespace geos.geomgraph
101 } // namespace geos
102
103 //#ifdef GEOS_INLINE
104 //# include "geos/geomgraph/Quadrant.inl"
105 //#endif
106
107 #endif // ifndef GEOS_GEOMGRAPH_QUADRANT_H
108
109 /**********************************************************************
110 * $Log$
111 * Revision 1.2 2006/03/24 09:52:41 strk
112 * USE_INLINE => GEOS_INLINE
113 *
114 * Revision 1.1 2006/03/09 16:46:49 strk
115 * geos::geom namespace definition, first pass at headers split
116 *
117 **********************************************************************/
118