(* Copyright (C) 2005-2023 Free Software Foundation, Inc. *)
(* This file is part of GNU Modula-2.

GNU Modula-2 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 3, or (at your option) any later
version.

GNU Modula-2 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 gm2; see the file COPYING.  If not, write to the Free Software
Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *)
DEFINITION MODULE Find ;

(*
   Title      : WriteMap
   Author     : Gaius Mulley
   Date       : Sat Dec  7 16:04:47 gmt 1991
   LastEdit   : Sat Dec  7 16:04:47 gmt 1991
   System     : LOGITECH MODULA-2/86
   Description: Works out an optimum route from a start position
      	        to a finish position.
*)

EXPORT QUALIFIED FindOptimumRoute ;


(*
   FindOptimumRoute - finds the optimum route between two points,
                      x1, y1, x2, y2. The directions are returned
                      in a string, Commands. A boolean is returned
                      if any commands were entered.
*)

PROCEDURE FindOptimumRoute (x1, y1, x2, y2: INTEGER;
      	       	     	    VAR Commands: ARRAY OF CHAR) : BOOLEAN ;

(*
   IsOptimumRoutePossible - returns true if we can use the optimum
                            route procedure to work out how to get
      	       	     	    to position, x2, y2 from x1, y1.
*)

PROCEDURE IsOptimumRoutePossible (x1, y1, x2, y2: INTEGER) : BOOLEAN ;


END Find.