closest_point2d_on_segment_ratio closest_point3dz_on_segment_ratio closest_point_on_segment_sphere datum2_point_eq datum2_point_ne datum_point2d datum_point2d_p datum_point3dz datum_point3dz_p datum_point4d datum_point_eq datum_round_geo datum_transform distance_fn ensure_has_M_gs ensure_has_not_M_gs ensure_has_not_Z ensure_has_not_Z_gs ensure_has_Z ensure_has_Z_gs ensure_non_empty ensure_not_geodetic ensure_point_type ensure_same_dimensionality ensure_same_dimensionality_gs ensure_same_dimensionality_tpoint_gs ensure_same_geodetic ensure_same_spatial_dimensionality ensure_same_spatial_dimensionality_stbox_gs ensure_same_spatial_dimensionality_temp_box ensure_same_srid ensure_same_srid_stbox ensure_same_srid_stbox_gs ensure_same_srid_tpoint_stbox ensure_spatial_validity geo_serialize geog_distance GEOG_TO_GEOM geom_distance2d geom_distance3d geom_intersection2d GEOM_TO_GEOG geopoint_collinear geosegm_interpolate_point geosegm_locate_point gserialized_point2d_p gserialized_point3dz_p gspoint_make interpolate_point4d_sphere lwline_make lwpointarr_make_trajectory lwpointarr_remove_duplicates pt_distance2d pt_distance3d pt_distance_fn tgeogpointsegm_intersection tgeompointsegm_intersection tpoint_at_stbox1 tpoint_get_coord tpoint_minus_stbox tpoint_round tpoint_transform tpointcontseq_transform tpointdiscseq_transform tpointinst_transform tpointsegm_intersection_value tpointseq_at_geometry tpointseq_interperiods tpointseqset_transform

closest_point2d_on_segment_ratio() long double closest_point2d_on_segment_ratio ( const POINT2D *  p, const POINT2D *  A, const POINT2D *  B, POINT2D *  closest  ) Return a long double between 0 and 1 representing the location of the closest point on the segment to the given point, as a fraction of total segment length (2D version) Note Function derived from the PostGIS function closest_point_on_segment