PointLocator.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2005-2011 Refractions Research Inc.
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: algorithm/PointLocator.java r320 (JTS-1.12)
 *
 **********************************************************************/
 
#ifndef GEOS_ALGORITHM_POINTLOCATOR_H
#define GEOS_ALGORITHM_POINTLOCATOR_H
 
#include <geos/export.h>
#include <geos/geom/Location.h> // for inlines
 
// Forward declarations
namespace geos {
        namespace geom {
                class Coordinate;
                class Geometry;
                class LinearRing;
                class LineString;
                class Polygon;
                class Point;
        }
}
 
namespace geos {
namespace algorithm { // geos::algorithm

class GEOS_DLL PointLocator {
public:
        PointLocator() {}
        ~PointLocator() {}

        int locate(const geom::Coordinate& p, const geom::Geometry *geom);

        bool intersects(const geom::Coordinate& p, const geom::Geometry *geom) {
                return locate(p, geom) != geom::Location::EXTERIOR;
        }
 
private:
 
        bool isIn;         // true if the point lies in or on any Geometry element
 
        int numBoundaries;    // the number of sub-elements whose boundaries the point lies in
 
        void computeLocation(const geom::Coordinate& p, const geom::Geometry *geom);
 
        void updateLocationInfo(int loc);
 
        int locate(const geom::Coordinate& p, const geom::Point *pt);
 
        int locate(const geom::Coordinate& p, const geom::LineString *l);
 
        int locateInPolygonRing(const geom::Coordinate& p, const geom::LinearRing *ring);
 
        int locate(const geom::Coordinate& p, const geom::Polygon *poly);
 
};
 
} // namespace geos::algorithm
} // namespace geos
 
 
#endif // GEOS_ALGORITHM_POINTLOCATOR_H