-- Created on: 1996-01-25
-- Created by: Laurent PAINNOT
-- Copyright (c) 1996-1999 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   GenLocateExtCS from Extrema
					 
    	---Purpose: With two close points it calculates the distance 
    	--          between two surfaces.
    	--          This distance can be a minimum or a maximum.

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


is
    Create returns GenLocateExtCS;

    Create (C:Curve from Adaptor3d; S: Surface from Adaptor3d; 
    	    T, U,V: Real; Tol1,Tol2: Real)
    	returns GenLocateExtCS
    	---Purpose: Calculates the distance with two close points.
    	--          The close points are defined by the parameter values
    	--          T for C and (U,V) for S.
    	--          The function F(t,u,v)=distance(C(t),S(u,v)) 
    	--          has an extremun when gradient(F)=0. The algorithm searchs
    	--          a zero near the close points.
    	raises  DomainError;
	    	-- if T,U,V are outside the definition ranges of the 
	    	-- curve and surface.
    
    Perform(me: in out; C: Curve from Adaptor3d; S: Surface from Adaptor3d; 
    	    T, U,V: Real; Tol1,Tol2: Real) 
    is static;
    
    
    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;

    PointOnCurve (me) returns POnCurv
    	---Purpose: Returns the point of the extremum distance on C.
    	---C++: return const&
    	raises  NotDone from StdFail
	    	-- if IsDone(me)=False.
    	is static;


    PointOnSurface (me) returns POnSurf
    	---Purpose: Returns the point of the extremum distance on S.
    	---C++: return const&
    	raises  NotDone from StdFail
	    	-- if IsDone(me)=False.
    	is static;

fields
    myDone  : Boolean;
    mySqDist: Real;
    myPoint1: POnCurv from Extrema;
    myPoint2: POnSurf from Extrema;

end GenLocateExtCS;