-- Created on: 1994-07-06
-- Created by: Laurent PAINNOT
-- Copyright (c) 1994-1999 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.


generic class GLocateExtCC2d from Extrema (Curve1    as any;
    	    	    	    	    	   Tool1     as any;
					   Curve2    as any;
					   Tool2     as any)
					
    	---Purpose: It calculates the distance between two curves with
    	--          a close point; these distances can be maximum or 
    	--          minimum.

uses   POnCurv2d from Extrema,
       Pnt2d     from gp,
       Vec2d     from gp,
       HArray1OfPnt2d from TColgp

raises  DomainError  from Standard,
    	NotDone      from StdFail


    class LCCache2d instantiates CurveCache from Extrema (Curve1, Pnt2d from gp, HArray1OfPnt2d from TColgp);

    class ELCC2d    instantiates GenExtCC      from Extrema
        (Curve1,
         Tool1,
         Curve2,
         Tool2,
         LCCache2d,
         HArray1OfPnt2d from TColgp,
         POnCurv2d,
         Pnt2d,
         Vec2d);


    class LocECC2d    instantiates GenLocateExtCC      from Extrema
    	(Curve1,
	 Tool1,
	 Curve2,
	 Tool2,
         POnCurv2d,
         Pnt2d,
         Vec2d);


is
    Create (C1: Curve1; C2: Curve2; U0,V0: Real)
    	returns GLocateExtCC2d
    	---Purpose: Calculates the distance with a close point. The
    	--          close point is defined by a parameter value on each 
    	--          curve.
    	--          The function F(u,v)=distance(C1(u),C2(v)) has an 
    	--          extremun when gradient(f)=0. The algorithm searchs
    	--          the zero near the close point.
    	raises  DomainError;
    	    	-- if U0 and V0 are outside the definition ranges of the 
    	    	-- curves.
    
    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; P1,P2: out POnCurv2d)
    	---Purpose: Returns the points of the extremum distance. 
    	--          P1 is on the first curve, P2 on the second one.
    	raises  NotDone from StdFail
    	    	-- if IsDone(me)=False.
    	is static;

fields
    myDone  : Boolean;
    mySqDist: Real;
    myPoint1: POnCurv2d;
    myPoint2: POnCurv2d;

end GLocateExtCC2d;