LWGEOM_startpoint_linestring()

Datum LWGEOM_startpoint_linestring

(

PG_FUNCTION_ARGS

)

Definition at line 719 of file lwgeom_ogc.c.

References CIRCSTRINGTYPE, COMPOUNDTYPE, geometry_serialize(), LINETYPE, lwcompound_get_startpoint(), LWGEOM_endpoint_linestring(), lwgeom_free(), lwgeom_from_gserialized(), lwline_get_lwpoint(), lwpoint_as_lwgeom(), PG_FUNCTION_INFO_V1(), ovdump::type, and LWGEOM::type.

Referenced by LWGEOM_m_point().

{
        GSERIALIZED *geom = PG_GETARG_GSERIALIZED_P(0);
        LWGEOM *lwgeom = lwgeom_from_gserialized(geom);
        LWPOINT *lwpoint = NULL;
        int type = lwgeom->type;

        if ( type == LINETYPE || type == CIRCSTRINGTYPE )
        {
                lwpoint = lwline_get_lwpoint((LWLINE*)lwgeom, 0);
        }
        else if ( type == COMPOUNDTYPE )
        {
                lwpoint = lwcompound_get_startpoint((LWCOMPOUND*)lwgeom);
        }

        lwgeom_free(lwgeom);
        PG_FREE_IF_COPY(geom, 0);

        if ( ! lwpoint )
                PG_RETURN_NULL();

        PG_RETURN_POINTER(geometry_serialize(lwpoint_as_lwgeom(lwpoint)));
}

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