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Quadrant.h

00001 /**********************************************************************
00002  * $Id: Quadrant.h 2557 2009-06-08 09:30:55Z 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  * Last port: geomgraph/Quadrant.java rev. 1.8 (JTS-1.10)
00018  *
00019  **********************************************************************/
00020 
00021 
00022 #ifndef GEOS_GEOMGRAPH_QUADRANT_H
00023 #define GEOS_GEOMGRAPH_QUADRANT_H
00024 
00025 #include <geos/export.h>
00026 #include <string>
00027 
00028 #include <geos/inline.h>
00029 
00030 // Forward declarations
00031 namespace geos {
00032         namespace geom {
00033                 class Coordinate;
00034         }
00035 }
00036 
00037 namespace geos {
00038 namespace geomgraph { // geos.geomgraph
00039 
00049 class GEOS_DLL Quadrant {
00050 
00051 public:
00052 
00053         static const int NE = 0;
00054         static const int NW = 1;
00055         static const int SW = 2;
00056         static const int SE = 3;
00057 
00064         static int quadrant(double dx, double dy);
00065 
00071         static int quadrant(const geom::Coordinate& p0,
00072                             const geom::Coordinate& p1);
00073 
00077         static bool isOpposite(int quad1, int quad2);
00078 
00079         /* 
00080          * Returns the right-hand quadrant of the halfplane defined by
00081          * the two quadrants,
00082          * or -1 if the quadrants are opposite, or the quadrant if they
00083          * are identical.
00084          */
00085         static int commonHalfPlane(int quad1, int quad2);
00086 
00091         static bool isInHalfPlane(int quad, int halfPlane);
00092 
00096         static bool isNorthern(int quad);
00097 };
00098 
00099 
00100 } // namespace geos.geomgraph
00101 } // namespace geos
00102 
00103 //#ifdef GEOS_INLINE
00104 //# include "geos/geomgraph/Quadrant.inl"
00105 //#endif
00106 
00107 #endif // ifndef GEOS_GEOMGRAPH_QUADRANT_H
00108 
00109 /**********************************************************************
00110  * $Log$
00111  * Revision 1.2  2006/03/24 09:52:41  strk
00112  * USE_INLINE => GEOS_INLINE
00113  *
00114  * Revision 1.1  2006/03/09 16:46:49  strk
00115  * geos::geom namespace definition, first pass at headers split
00116  *
00117  **********************************************************************/
00118 

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