-- Created on: 1995-07-18
-- Created by: Modelistation
-- Copyright (c) 1995-1999 Matra Datavision
-- Copyright (c) 1999-2012 OPEN CASCADE SAS
--
-- The content of this file is subject to the Open CASCADE Technology Public
-- License Version 6.5 (the "License"). You may not use the content of this file
-- except in compliance with the License. Please obtain a copy of the License
-- at http://www.opencascade.org and read it completely before using this file.
--
-- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
-- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
--
-- The Original Code and all software distributed under the License is
-- distributed on an "AS IS" basis, without warranty of any kind, and the
-- Initial Developer hereby disclaims all such warranties, including without
-- limitation, any warranties of merchantability, fitness for a particular
-- purpose or non-infringement. Please see the License for the specific terms
-- and conditions governing the rights and limitations under the License.



class   GenLocateExtPS from Extrema
					 
    	---Purpose: With a close point, it calculates the distance 
    	--          between a point and a surface.
    	--          This distance can be a minimum or a maximum.

uses    POnSurf from Extrema,
        Pnt     from gp,
	Surface from Adaptor3d
 
raises  DomainError from Standard,
    	NotDone     from StdFail


is
    Create returns GenLocateExtPS;

    Create (P: Pnt; S: Surface from Adaptor3d; U0,V0: Real; TolU,TolV: Real)
    	returns GenLocateExtPS
    	---Purpose: Calculates the distance with a close point.
    	--          The close point is defined by the parameter values
    	--          U0 and V0.
    	--          The function F(u,v)=distance(S(u,v),p) has an
    	--          extremun when gradient(F)=0. The algorithm searchs
    	--          a zero near the close point.
    	raises  DomainError;
	    	-- if U0,V0 are outside the definition ranges of the 
	    	-- surface.
    
    IsDone (me) returns Boolean
    	---Purpose: Returns True if the distance is found.
    	is static;

    SquareDistance (me) returns Real
    	---Purpose: Returns the value of the extremum square distance.
    	raises  NotDone from StdFail
	    	-- if IsDone(me)=False.
    	is static;

    Point (me) returns POnSurf
    	---Purpose: Returns the point of the extremum distance.
    	raises  NotDone from StdFail
	    	-- if IsDone(me)=False.
    	is static;

fields
    myDone : Boolean;
    mySqDist: Real;
    myPoint: POnSurf from Extrema;

end GenLocateExtPS;