LWGEOM_line_from_mpoint()

Datum LWGEOM_line_from_mpoint

(

PG_FUNCTION_ARGS

)

Definition at line 1350 of file lwgeom_functions_basic.c.

{
        GSERIALIZED *ingeom, *result;
        LWLINE *lwline;
        LWMPOINT *mpoint;
 
        POSTGIS_DEBUG(2, "LWGEOM_line_from_mpoint called");
 
        /* Get input GSERIALIZED and deserialize it */
        ingeom = PG_GETARG_GSERIALIZED_P(0);
 
        if (gserialized_get_type(ingeom) != MULTIPOINTTYPE)
        {
                elog(ERROR, "makeline: input must be a multipoint");
                PG_RETURN_NULL(); /* input is not a multipoint */
        }
 
        mpoint = lwgeom_as_lwmpoint(lwgeom_from_gserialized(ingeom));
        lwline = lwline_from_lwmpoint(mpoint->srid, mpoint);
        if (!lwline)
        {
                PG_FREE_IF_COPY(ingeom, 0);
                elog(ERROR, "makeline: lwline_from_lwmpoint returned NULL");
                PG_RETURN_NULL();
        }
 
        result = geometry_serialize(lwline_as_lwgeom(lwline));
 
        PG_FREE_IF_COPY(ingeom, 0);
        lwline_free(lwline);
 
        PG_RETURN_POINTER(result);
}

References geometry_serialize(), gserialized_get_type(), lwgeom_as_lwmpoint(), lwgeom_from_gserialized(), lwline_as_lwgeom(), lwline_free(), lwline_from_lwmpoint(), MULTIPOINTTYPE, and LWMPOINT::srid.

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