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RayCrossingCounter.h

00001 /**********************************************************************
00002  * $Id: RayCrossingCounter.h 2770 2009-12-03 19:27:18Z mloskot $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2006 Refractions Research Inc.
00008  *
00009  * This is free software; you can redistribute and/or modify it under
00010  * the terms of the GNU Lesser General Public Licence as published
00011  * by the Free Software Foundation. 
00012  * See the COPYING file for more information.
00013  *
00014  *
00015  **********************************************************************
00016  *
00017  * Last port: algorithm/RayCrossingCounter.java rev. 1.2 (JTS-1.9)
00018  *
00019  **********************************************************************/
00020 
00021 #ifndef GEOS_ALGORITHM_RAYCROSSINGCOUNTER_H
00022 #define GEOS_ALGORITHM_RAYCROSSINGCOUNTER_H
00023 
00024 #include <geos/export.h>
00025 
00026 #include <vector>
00027 
00028 // forward declarations
00029 namespace geos {
00030         namespace geom {
00031                 class Coordinate;
00032                 class CoordinateSequence;
00033         }
00034 }
00035 
00036 
00037 namespace geos {
00038 namespace algorithm {
00039 
00067 class GEOS_DLL RayCrossingCounter 
00068 {
00069 private:
00070         const geom::Coordinate& point;
00071         
00072         int crossingCount;
00073         
00074         // true if the test point lies on an input segment
00075     bool isPointOnSegment;
00076 
00077     // Declare type as noncopyable
00078     RayCrossingCounter(const RayCrossingCounter& other);
00079     RayCrossingCounter& operator=(const RayCrossingCounter& rhs);
00080 
00081 public:
00090         static int locatePointInRing(const geom::Coordinate& p,
00091                                      const geom::CoordinateSequence& ring);
00092 
00094         static int locatePointInRing(const geom::Coordinate& p,
00095                  const std::vector<const geom::Coordinate*>& ring);
00096 
00097         RayCrossingCounter(const geom::Coordinate& point)
00098         :       point( point),
00099                 crossingCount( 0),
00100                 isPointOnSegment( false)
00101         { }
00102         
00109         void countSegment(const geom::Coordinate& p1,
00110                           const geom::Coordinate& p2);
00111         
00121         bool isOnSegment() 
00122         { 
00123                 return isPointOnSegment; 
00124         }
00125         
00136         int getLocation();
00137     
00148         bool isPointInPolygon();
00149 
00150 };
00151 
00152 } // geos::algorithm
00153 } // geos
00154 
00155 #endif // GEOS_ALGORITHM_RAYCROSSINGCOUNTER_H
00156 /**********************************************************************
00157  * $Log$
00158  **********************************************************************/
00159 

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