frechet_distance_functor.h

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#ifndef GIS__FRECHET_DISTANCE_FUNCTOR_H_INCLUDED
#define GIS__FRECHET_DISTANCE_FUNCTOR_H_INCLUDED
 
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/// @file
///
/// This file declares the frechet_distance functor interface.
///
/// The functor is not intended for use directly by MySQL code. It should be
/// used indirectly through the gis::frechet_distance() function.
///
/// @see gis::frechet_distance
 
#include <memory>  // std::unique_ptr
 
#include <boost/geometry.hpp>
#include "sql/gis/functor.h"
#include "sql/gis/geometries.h"
 
namespace gis {
 
/// Frechet_distance functor that calls Boost.Geometry with the correct
/// parameter types.
///
/// The functor throws exceptions and is therefore only intended used to
/// implement frechet_distance or other geographic functions.
/// It should not be used directly by other MySQL code.
class Frechet_distance : public Functor<double> {
 private:
  std::unique_ptr<boost::geometry::strategy::distance::geographic<
      boost::geometry::strategy::andoyer,
      boost::geometry::srs::spheroid<double>>>
      m_geographic_strategy;
 
 public:
  Frechet_distance(double major, double minor);
  double operator()(const Geometry *g1, const Geometry *g2) const override;
 
  double eval(const Geometry *g1, const Geometry *g2) const;
 
  double eval(const Geographic_linestring *g1,
              const Geographic_linestring *g2) const;
  double eval(const Cartesian_linestring *g1,
              const Cartesian_linestring *g2) const;
};
 
}  // namespace gis
 
#endif  // GIS__FRECHET_DISTANCE_FUNCTOR_H_INCLUDED