PointLocator.h

00001 /**********************************************************************
00002  * $Id: PointLocator.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 #ifndef GEOS_ALGORITHM_POINTLOCATOR_H
00018 #define GEOS_ALGORITHM_POINTLOCATOR_H
00019 
00020 #include <geos/geom/Location.h> // for inlines
00021 
00022 // Forward declarations
00023 namespace geos {
00024         namespace geom {
00025                 class Coordinate;
00026                 class Geometry;
00027                 class LinearRing;
00028                 class LineString;
00029                 class Polygon;
00030         }
00031 }
00032 
00033 namespace geos {
00034 namespace algorithm { // geos::algorithm
00035 
00053 class PointLocator {
00054 public:
00055         PointLocator() {}
00056         ~PointLocator() {}
00057 
00068         int locate(const geom::Coordinate& p, const geom::Geometry *geom);
00069 
00078         bool intersects(const geom::Coordinate& p, const geom::Geometry *geom) {
00079                 return locate(p, geom) != geom::Location::EXTERIOR;
00080         }
00081 
00082 private:
00083 
00084         bool isIn;         // true if the point lies in or on any Geometry element
00085 
00086         int numBoundaries;    // the number of sub-elements whose boundaries the point lies in
00087 
00088         void computeLocation(const geom::Coordinate& p, const geom::Geometry *geom);
00089 
00090         void updateLocationInfo(int loc);
00091 
00092         int locate(const geom::Coordinate& p, const geom::LineString *l);
00093 
00094         int locateInPolygonRing(const geom::Coordinate& p, const geom::LinearRing *ring);
00095 
00096         int locate(const geom::Coordinate& p, const geom::Polygon *poly);
00097 
00098 };
00099 
00100 } // namespace geos::algorithm
00101 } // namespace geos
00102 
00103 
00104 #endif // GEOS_ALGORITHM_POINTLOCATOR_H
00105 
00106 /**********************************************************************
00107  * $Log$
00108  * Revision 1.1  2006/03/09 16:46:48  strk
00109  * geos::geom namespace definition, first pass at headers split
00110  *
00111  **********************************************************************/
00112 

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