line_interpolate.cc

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/**
    @file

    Implements the line interpolate point functor and function
*/

#include <boost/geometry.hpp>

#include "my_inttypes.h"   // MYF
#include "my_sys.h"        // my_error
#include "mysqld_error.h"  // ER_DATA_OUT_OF_RANGE
#include "sql/gis/geometries.h"
#include "sql/gis/geometries_cs.h"
#include "sql/gis/geometries_traits.h"
#include "sql/gis/length.h"
#include "sql/gis/line_interpolate.h"
#include "sql/gis/line_interpolate_functor.h"
#include "sql/sql_exception_handler.h"  // handle_gis_exception

namespace bg = boost::geometry;

namespace gis {

std::unique_ptr<Geometry> Line_interpolate_point::operator()(
    const Geometry &g) const {
  return apply(*this, g);
}

std::unique_ptr<Geometry> Line_interpolate_point::eval(
    const Geometry &g) const {
  assert(false);
  throw not_implemented_exception::for_non_projected(g);
}

std::unique_ptr<Geometry> Line_interpolate_point::eval(
    const Cartesian_linestring &g) const {
  if (m_return_multiple_points) {
    Cartesian_multipoint *mpt = new Cartesian_multipoint();
    std::unique_ptr<Geometry> result(mpt);
    bg::line_interpolate(g, m_distance, *mpt);
    return result;
  }
  Cartesian_point *pt = new Cartesian_point();
  std::unique_ptr<Geometry> result(pt);
  bg::line_interpolate(g, m_distance, *pt);
  return result;
}

std::unique_ptr<Geometry> Line_interpolate_point::eval(
    const Geographic_linestring &g) const {
  if (m_return_multiple_points) {
    Geographic_multipoint *mpt = new Geographic_multipoint();
    std::unique_ptr<Geometry> result(mpt);
    bg::line_interpolate(g, m_distance, *mpt);
    return result;
  }
  Geographic_point *pt = new Geographic_point();
  std::unique_ptr<Geometry> result(pt);
  bg::line_interpolate(g, m_distance, *pt);
  return result;
}

///////////////////////////////////////////////////////////////////////////////////////////////////

bool line_interpolate_point(const dd::Spatial_reference_system *srs,
                            const Geometry *g,
                            const double interpolation_distance,
                            const bool return_multiple_points,
                            const char *func_name,
                            std::unique_ptr<Geometry> *result,
                            bool *result_null) noexcept {
  try {
    assert(((srs == nullptr || srs->is_cartesian()) &&
            g->coordinate_system() == Coordinate_system::kCartesian) ||
           (srs && srs->is_geographic() &&
            g->coordinate_system() == Coordinate_system::kGeographic));

    if (g->is_empty()) {
      *result_null = true;
      return false;
    }

    if (srs && srs->is_geographic())
      *result = Line_interpolate_point(
          interpolation_distance, return_multiple_points,
          srs->semi_major_axis(), srs->semi_minor_axis())(*g);
    else
      *result = Line_interpolate_point(interpolation_distance,
                                       return_multiple_points)(*g);

    return false;
  } catch (...) {
    handle_gis_exception(func_name);
    return true;
  }
}

}  // namespace gis