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