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# PointLocator.h

    00001 /**********************************************************************
    00002  * $Id: PointLocator.h 2556 2009-06-06 22:22:28Z strk $
    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/export.h>
    00021 #include <geos/geom/Location.h> // for inlines
    00022
    00023 // Forward declarations
    00024 namespace geos {
    00025         namespace geom {
    00026                 class Coordinate;
    00027                 class Geometry;
    00028                 class LinearRing;
    00029                 class LineString;
    00030                 class Polygon;
    00031         }
    00032 }
    00033
    00034 namespace geos {
    00035 namespace algorithm { // geos::algorithm
    00036
    00054 class GEOS_DLL PointLocator {
    00055 public:
    00056         PointLocator() {}
    00057         ~PointLocator() {}
    00058
    00069         int locate(const geom::Coordinate& p, const geom::Geometry *geom);
    00070
    00079         bool intersects(const geom::Coordinate& p, const geom::Geometry *geom) {
    00080                 return locate(p, geom) != geom::Location::EXTERIOR;
    00081         }
    00082
    00083 private:
    00084
    00085         bool isIn;         // true if the point lies in or on any Geometry element
    00086
    00087         int numBoundaries;    // the number of sub-elements whose boundaries the point lies in
    00088
    00089         void computeLocation(const geom::Coordinate& p, const geom::Geometry *geom);
    00090
    00091         void updateLocationInfo(int loc);
    00092
    00093         int locate(const geom::Coordinate& p, const geom::LineString *l);
    00094
    00095         int locateInPolygonRing(const geom::Coordinate& p, const geom::LinearRing *ring);
    00096
    00097         int locate(const geom::Coordinate& p, const geom::Polygon *poly);
    00098
    00099 };
    00100
    00101 } // namespace geos::algorithm
    00102 } // namespace geos
    00103
    00104
    00105 #endif // GEOS_ALGORITHM_POINTLOCATOR_H
    00106
    00107 /**********************************************************************
    00108  * $Log$
    00109  * Revision 1.1  2006/03/09 16:46:48  strk
    00110  * geos::geom namespace definition, first pass at headers split
    00111  *
    00112  **********************************************************************/
    00113