circle_type closest_point2d_on_segment_ratio closest_point3dz_on_segment_ratio closest_point_on_segment_sphere datum2_geog_centroid datum2_geom_centroid datum2_point_eq datum2_point_ne datum2_point_nsame datum2_point_same datum_geog_distance datum_geom_distance2d datum_geom_distance3d datum_point4d datum_point_eq datum_point_same datum_pt_distance2d datum_pt_distance3d eacomp_tgeo_geo ensure_circle_type ensure_has_M_geo ensure_has_not_M_geo ensure_has_not_Z_geo ensure_has_Z_geo ensure_mline_type ensure_not_empty ensure_not_geodetic ensure_not_geodetic_geo ensure_point_type ensure_same_dimensionality ensure_same_dimensionality_geo ensure_same_dimensionality_tspatial_geo ensure_same_geodetic ensure_same_geodetic_geo ensure_same_geodetic_stbox_geo ensure_same_geodetic_tspatial_base ensure_same_geodetic_tspatial_geo ensure_same_spatial_dimensionality ensure_same_spatial_dimensionality_stbox_geo ensure_same_srid ensure_spatial_validity ensure_srid_is_latlong ensure_srid_known ensure_valid_geo_geo ensure_valid_spatial_stbox_stbox ensure_valid_stbox_geo ensure_valid_tgeo_geo ensure_valid_tgeo_stbox ensure_valid_tgeo_tgeo ensure_valid_tpoint_geo ensure_valid_tpoint_tpoint ensure_valid_tspatial_base ensure_valid_tspatial_geo ensure_valid_tspatial_tspatial geo_distance_fn geo_extract_elements geo_serialize geocircle_make geopoint_cmp geopoint_collinear geopoint_eq geopoint_make geopoint_same interpolate_point4d_spheroid lwcircle_make lwcoll_from_points_lines lwline_make lwpointarr_make_trajectory lwpointarr_remove_duplicates mline_type pointsegm_interpolate pointsegm_locate pointsegm_locate_point pt_distance_fn same_dimensionality_tspatial_geo same_spatial_dimensionality spatial_flags spheroid_init_from_srid TGEO_TO_TPOINT TGEOG_TO_TGEOM TGEOGP_TO_TGEOMP tgeogpointsegm_intersection TGEOM_TO_TGEOG TGEOMP_TO_TGEOGP tgeompointsegm_intersection tpoint_get_coord TPOINT_TO_TGEO tpointsegm_intersection_value tpointseq_stops_iter

pointsegm_locate() long double pointsegm_locate ( Datum  start, Datum  end, Datum  point, double *  dist  ) Return a float in (0,1) representing the location of the closest point on the line segment to the given point, as a fraction of the total segment length, return -1.0 if the point is not located in the segment or if is approximately equal to the start or to the end point. Parameters [in] start,end Points defining the segment [in] point Reference point [out] dist Distance Note The function returns -1.0 if the point is approximately equal to the start or the end point since it is used in the lifting infrastructure for determining the crossings or the turning points after verifying that the bounds of the segment are not equal to the point.