ST_InterpolatePoint()

Datum ST_InterpolatePoint

(

PG_FUNCTION_ARGS

)

Definition at line 184 of file lwgeom_functions_lrs.c.

References error_if_srid_mismatch(), gserialized_get_srid(), gserialized_get_type(), gserialized_has_m(), LINETYPE, lwgeom_as_lwpoint(), lwgeom_from_gserialized(), lwgeom_interpolate_point(), LWGEOM_line_locate_point(), PG_FUNCTION_INFO_V1(), and POINTTYPE.

Referenced by ST_LocateBetweenElevations().

{
        GSERIALIZED *gser_line = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *gser_point = PG_GETARG_GSERIALIZED_P(1);
        LWGEOM *lwline;
        LWPOINT *lwpoint;

        if ( gserialized_get_type(gser_line) != LINETYPE )
        {
                elog(ERROR,"ST_InterpolatePoint: 1st argument isn't a line");
                PG_RETURN_NULL();
        }
        if ( gserialized_get_type(gser_point) != POINTTYPE )
        {
                elog(ERROR,"ST_InterpolatePoint: 2st argument isn't a point");
                PG_RETURN_NULL();
        }

        error_if_srid_mismatch(gserialized_get_srid(gser_line), gserialized_get_srid(gser_point));

        if ( ! gserialized_has_m(gser_line) )
        {
                elog(ERROR,"ST_InterpolatePoint only accepts geometries that have an M dimension");
                PG_RETURN_NULL();
        }

        lwpoint = lwgeom_as_lwpoint(lwgeom_from_gserialized(gser_point));
        lwline = lwgeom_from_gserialized(gser_line);

        PG_RETURN_FLOAT8(lwgeom_interpolate_point(lwline, lwpoint));
}

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