DiscreteFrechetDistance.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2016 Shinichi SUGIYAMA (shin.sugi@gmail.com)
 *
 * 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: original work
 *
 * Developed by Shinichi SUGIYAMA (shin.sugi@gmail.com)
 * based on http://www.kr.tuwien.ac.at/staff/eiter/et-archive/cdtr9464.pdf
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
#include <geos/algorithm/distance/PointPairDistance.h> // for composition
#include <geos/algorithm/distance/DistanceToPoint.h> // for composition
#include <geos/util/IllegalArgumentException.h> // for inlines
#include <geos/geom/Geometry.h> // for inlines
#include <geos/util/math.h> // for inlines
#include <geos/geom/CoordinateFilter.h> // for inheritance
#include <geos/geom/CoordinateSequence.h> // for inheritance
 
#include <cstddef>
#include <vector>
 
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
#endif
 
namespace geos {
namespace algorithm {
//class RayCrossingCounter;
}
namespace geom {
class Geometry;
class Coordinate;
//class CoordinateSequence;
}
namespace index {
namespace intervalrtree {
//class SortedPackedIntervalRTree;
}
}
}
 
namespace geos {
namespace algorithm { // geos::algorithm
namespace distance { // geos::algorithm::distance
 
class GEOS_DLL DiscreteFrechetDistance {
public:
 
    static double distance(const geom::Geometry& g0,
                           const geom::Geometry& g1);
 
    static double distance(const geom::Geometry& g0,
                           const geom::Geometry& g1, double densifyFrac);
 
    DiscreteFrechetDistance(const geom::Geometry& p_g0,
                            const geom::Geometry& p_g1)
        :
        g0(p_g0),
        g1(p_g1),
        ptDist(),
        densifyFrac(0.0)
    {}
 
    void setDensifyFraction(double dFrac);
 
    double
    distance()
    {
        compute(g0, g1);
        return ptDist.getDistance();
    }
 
    const std::array<geom::Coordinate, 2>
    getCoordinates() const
    {
        return ptDist.getCoordinates();
    }
 
private:
    geom::Coordinate getSegmentAt(const geom::CoordinateSequence& seq, std::size_t index);
 
    PointPairDistance& getFrecheDistance(std::vector< std::vector<PointPairDistance> >& ca, std::size_t i, std::size_t j,
                                         const geom::CoordinateSequence& p, const geom::CoordinateSequence& q);
 
    void compute(const geom::Geometry& discreteGeom, const geom::Geometry& geom);
 
    const geom::Geometry& g0;
 
    const geom::Geometry& g1;
 
    PointPairDistance ptDist;
 
    double densifyFrac; // = 0.0;
 
    // Declare type as noncopyable
    DiscreteFrechetDistance(const DiscreteFrechetDistance& other) = delete;
    DiscreteFrechetDistance& operator=(const DiscreteFrechetDistance& rhs) = delete;
};
 
} // geos::algorithm::distance
} // geos::algorithm
} // geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif