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# Quadrant.h

    00001 /**********************************************************************
    00002  * $Id: Quadrant.h 1820 2006-09-06 16:54:23Z mloskot $
    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
    00018 #ifndef GEOS_GEOMGRAPH_QUADRANT_H
    00019 #define GEOS_GEOMGRAPH_QUADRANT_H
    00020
    00021 #include <string>
    00022
    00023 #include <geos/inline.h>
    00024
    00025 // Forward declarations
    00026 namespace geos {
    00027         namespace geom {
    00028                 class Coordinate;
    00029         }
    00030 }
    00031
    00032 namespace geos {
    00033 namespace geomgraph { // geos.geomgraph
    00034
    00044 class Quadrant {
    00045 public:
    00050         static int quadrant(double dx, double dy);
    00051
    00055         static int quadrant(const geom::Coordinate& p0, const geom::Coordinate& p1);
    00056
    00060         static bool isOpposite(int quad1, int quad2);
    00061
    00062         /*
    00063          * Returns the right-hand quadrant of the halfplane defined by
    00064          * the two quadrants,
    00065          * or -1 if the quadrants are opposite, or the quadrant if they
    00066          * are identical.
    00067          */
    00068         static int commonHalfPlane(int quad1, int quad2);
    00069
    00074         static bool isInHalfPlane(int quad, int halfPlane);
    00075
    00079         static bool isNorthern(int quad);
    00080 };
    00081
    00082
    00083 } // namespace geos.geomgraph
    00084 } // namespace geos
    00085
    00086 //#ifdef GEOS_INLINE
    00087 //# include "geos/geomgraph/Quadrant.inl"
    00088 //#endif
    00089
    00090 #endif // ifndef GEOS_GEOMGRAPH_QUADRANT_H
    00091
    00092 /**********************************************************************
    00093  * $Log$
    00094  * Revision 1.2  2006/03/24 09:52:41  strk
    00095  * USE_INLINE => GEOS_INLINE
    00096  *
    00097  * Revision 1.1  2006/03/09 16:46:49  strk
    00098  * geos::geom namespace definition, first pass at headers split
    00099  *
    00100  **********************************************************************/
    00101