line_interpolate.h

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/**
    @file
 
    Interface for obtaining a point at a given distance on a linestring
*/
 
#ifndef SQL_GIS_LINE_INTERPOLATE_H_INCLUDED
#define SQL_GIS_LINE_INTERPOLATE_H_INCLUDED
 
#include <memory>  // std::unique_ptr
 
#include "sql/dd/types/spatial_reference_system.h"  // dd::Spatial_reference_system
#include "sql/gis/geometries.h"
 
namespace gis {
/// Finds the point in a linestring at a given distance from the starting point.
///
/// @param[in] srs The spatial reference system.
/// @param[in] g Input geometry.
/// @param[in] interpolation_distance The distance from the starting point.
/// @param[in] return_multiple_points True if the return geometry should be a
/// multipoint. False if the return value should be a single point.
/// @param[in] func_name Function name used in error reporting.
/// @param[out] result Result. Invalid if `result_null`.
/// @param[out] result_null Whether result is `NULL` instead of `result`.
///
/// @retval false Success.
/// @retval true An error has occurred. The error has been reported with
/// my_error().
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;
 
}  // namespace gis
 
#endif  // SQL_GIS_LINE_INTERPOLATE_H_INCLUDED