area_functor.h

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/// @file
///
/// Declares the area functor interface.
///
/// The functor is not intended for use directly by MySQL code. It should be
/// used indirectly through the gis::area() function.
///
/// @see gis::area
 
#ifndef SQL_GIS_AREA_FUNCTOR_H_INCLUDED
#define SQL_GIS_AREA_FUNCTOR_H_INCLUDED
 
#include <boost/geometry.hpp>  // boost::geometry
 
#include "sql/gis/functor.h"        // gis::Unary_functor
#include "sql/gis/geometries.h"     // gis::Geometry
#include "sql/gis/geometries_cs.h"  // gis::{Cartesian_*,Geographic_*}
 
namespace gis {
 
/// Area functor that calls boost::geometry::area with the correct parameter
/// types.
///
/// The functor may throw exceptions. It is intended for implementing geographic
/// functions. It should not be used directly by other MySQL code.
class Area : public Unary_functor<double> {
  double m_semi_major;
  double m_semi_minor;
 
  boost::geometry::strategy::area::geographic<> m_geographic_strategy;
 
 public:
  Area();
  Area(double semi_major, double semi_minor);
 
  double operator()(const Geometry &g) const override;
 
  double eval(const Cartesian_polygon &g) const;
  double eval(const Cartesian_multipolygon &g) const;
 
  double eval(const Geographic_polygon &g) const;
  double eval(const Geographic_multipolygon &g) const;
 
  double eval(const Geometry &g) const;
};
 
}  // namespace gis
 
#endif  // SQL_GIS_AREA_FUNCTOR_H_INCLUDED