root/branches/anton/extra/driving_distance/sql/routing_dd.sql

--
-- Copyright (c) 2005 Sylvain Pasche,
--               2006-2007 Anton A. Patrushev, Orkney, Inc.
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
--


CREATE OR REPLACE FUNCTION driving_distance(sql text, source_id integer, 
        distance float8,directed boolean, has_reverse_cost boolean)
        RETURNS SETOF path_result
        AS '$libdir/routing'
        LANGUAGE 'C' IMMUTABLE STRICT;
                        
-----------------------------------------------------------------------
-- Core function for alpha shape computation.
-- The sql should return vertex ids and x,y values. Return ordered
-- vertex ids. Used in points_as_polygon function found in 
-- routing_postgis.sql
-----------------------------------------------------------------------
CREATE OR REPLACE FUNCTION alphashape(sql text)
        RETURNS SETOF vertex_result
        AS '$libdir/routing'
        LANGUAGE 'C' IMMUTABLE STRICT;