GEOS 3.3.1
PointLocator.h
00001 /**********************************************************************
00002  * $Id: PointLocator.h 3174 2011-02-02 19:24:03Z strk $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2005-2011 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/PointLocator.java r320 (JTS-1.12)
00018  *
00019  **********************************************************************/
00020 
00021 #ifndef GEOS_ALGORITHM_POINTLOCATOR_H
00022 #define GEOS_ALGORITHM_POINTLOCATOR_H
00023 
00024 #include <geos/export.h>
00025 #include <geos/geom/Location.h> // for inlines
00026 
00027 // Forward declarations
00028 namespace geos {
00029         namespace geom {
00030                 class Coordinate;
00031                 class Geometry;
00032                 class LinearRing;
00033                 class LineString;
00034                 class Polygon;
00035         }
00036 }
00037 
00038 namespace geos {
00039 namespace algorithm { // geos::algorithm
00040 
00058 class GEOS_DLL PointLocator {
00059 public:
00060         PointLocator() {}
00061         ~PointLocator() {}
00062 
00073         int locate(const geom::Coordinate& p, const geom::Geometry *geom);
00074 
00083         bool intersects(const geom::Coordinate& p, const geom::Geometry *geom) {
00084                 return locate(p, geom) != geom::Location::EXTERIOR;
00085         }
00086 
00087 private:
00088 
00089         bool isIn;         // true if the point lies in or on any Geometry element
00090 
00091         int numBoundaries;    // the number of sub-elements whose boundaries the point lies in
00092 
00093         void computeLocation(const geom::Coordinate& p, const geom::Geometry *geom);
00094 
00095         void updateLocationInfo(int loc);
00096 
00097         int locate(const geom::Coordinate& p, const geom::LineString *l);
00098 
00099         int locateInPolygonRing(const geom::Coordinate& p, const geom::LinearRing *ring);
00100 
00101         int locate(const geom::Coordinate& p, const geom::Polygon *poly);
00102 
00103 };
00104 
00105 } // namespace geos::algorithm
00106 } // namespace geos
00107 
00108 
00109 #endif // GEOS_ALGORITHM_POINTLOCATOR_H
00110 
00111 /**********************************************************************
00112  * $Log$
00113  * Revision 1.1  2006/03/09 16:46:48  strk
00114  * geos::geom namespace definition, first pass at headers split
00115  *
00116  **********************************************************************/
00117