CGAlgorithms.h

00001 /**********************************************************************
00002  * $Id: CGAlgorithms.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  * Last port: algorithm/CGAlgorithms.java rev. 1.34 (JTS-1.7.1)
00018  *
00019  **********************************************************************/
00020 
00021 #ifndef GEOS_ALGORITHM_CGALGORITHM_H
00022 #define GEOS_ALGORITHM_CGALGORITHM_H
00023 
00024 #include <vector>
00025 
00026 // Forward declarations
00027 namespace geos {
00028         namespace geom {
00029                 class Coordinate;
00030                 class CoordinateSequence;
00031         }
00032 }
00033 
00034 
00035 namespace geos {
00036 namespace algorithm { // geos::algorithm
00037 
00046 class CGAlgorithms {
00047 
00048 public:
00049 
00050         enum {
00051                 CLOCKWISE=-1,
00052                 COLLINEAR,
00053                 COUNTERCLOCKWISE
00054         };
00055 
00056         enum {
00057                 RIGHT=-1,
00058                 LEFT,
00059                 STRAIGHT
00060         };
00061 
00062         CGAlgorithms(){};
00063 
00078         static bool isPointInRing(const geom::Coordinate& p,
00079                         const geom::CoordinateSequence* ring);
00080 
00082         static bool isPointInRing(const geom::Coordinate& p,
00083                         const std::vector<const geom::Coordinate*>& ring);
00084 
00092         static bool isOnLine(const geom::Coordinate& p,
00093                 const geom::CoordinateSequence* pt);
00094 
00110         static bool isCCW(const geom::CoordinateSequence* ring);
00111 
00124         static int computeOrientation(const geom::Coordinate& p1,
00125                         const geom::Coordinate& p2,
00126                         const geom::Coordinate& q);
00127 
00138         static double distancePointLine(const geom::Coordinate& p,
00139                         const geom::Coordinate& A,
00140                         const geom::Coordinate& B);
00141 
00151         static double distancePointLinePerpendicular(const geom::Coordinate& p,
00152                         const geom::Coordinate& A,
00153                         const geom::Coordinate& B);
00154 
00165         static double distanceLineLine(const geom::Coordinate& A,
00166                         const geom::Coordinate& B,
00167                         const geom::Coordinate& C,
00168                         const geom::Coordinate& D);
00169 
00174         static double signedArea(const geom::CoordinateSequence* ring);
00175 
00183         static double length(const geom::CoordinateSequence* pts);
00184 
00197         static int orientationIndex(const geom::Coordinate& p1,
00198                         const geom::Coordinate& p2,
00199                         const geom::Coordinate& q);
00200 
00201 };
00202 
00203 } // namespace geos::algorithm
00204 } // namespace geos
00205 
00206 #endif // GEOS_ALGORITHM_CGALGORITHM_H
00207 
00208 /**********************************************************************
00209  * $Log$
00210  * Revision 1.2  2006/05/02 14:51:53  strk
00211  * Added port info and fixed doxygen comments for CGAlgorithms class
00212  *
00213  * Revision 1.1  2006/03/09 16:46:48  strk
00214  * geos::geom namespace definition, first pass at headers split
00215  *
00216  **********************************************************************/
00217 

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