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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