LWGEOM_m_point()

Datum LWGEOM_m_point

(

PG_FUNCTION_ARGS

)

Definition at line 686 of file lwgeom_ogc.c.

{
        GSERIALIZED *geom;
        LWPOINT *point = NULL;
        LWGEOM *lwgeom;
        POINT3DM p;
 
        geom = PG_GETARG_GSERIALIZED_P(0);
 
        if ( gserialized_get_type(geom) != POINTTYPE )
                lwpgerror("Argument to ST_M() must be a point");
 
        lwgeom = lwgeom_from_gserialized(geom);
        point = lwgeom_as_lwpoint(lwgeom);
 
        if ( lwgeom_is_empty(lwgeom) )
                PG_RETURN_NULL();
 
        /* no M in input */
        if ( ! FLAGS_GET_M(point->flags) ) PG_RETURN_NULL();
 
        getPoint3dm_p(point->point, 0, &p);
 
        PG_FREE_IF_COPY(geom, 0);
 
        PG_RETURN_FLOAT8(p.m);
}

References LWPOINT::flags, FLAGS_GET_M, getPoint3dm_p(), gserialized_get_type(), lwgeom_as_lwpoint(), lwgeom_from_gserialized(), lwgeom_is_empty(), POINT3DM::m, LWPOINT::point, and POINTTYPE.

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