-- Created on: 1996-01-23
-- 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   GenExtCS from Extrema 

    	---Purpose: It calculates all the extremum distances
    	--          between acurve and a surface.
    	--          These distances can be minimum or maximum.

uses  	POnSurf       from Extrema,
        POnCurv       from Extrema,
    	Pnt           from gp,
	HArray1OfPnt  from TColgp,
	HArray2OfPnt  from TColgp,
	FuncExtCS     from Extrema,
	Surface       from Adaptor3d,
	SurfacePtr    from Adaptor3d,
	Curve         from Adaptor3d,
	CurvePtr      from Adaptor3d

raises  NotDone      from StdFail,
    	OutOfRange   from Standard,
	TypeMismatch from Standard
	

is

    Create returns GenExtCS;
    
    Create (C: Curve from Adaptor3d; S: Surface from Adaptor3d; 
    	    NbT: Integer; NbU,NbV: Integer; Tol1,Tol2: Real)
    	returns GenExtCS;
      	---Purpose: It calculates all the distances.
        --          The function F(u,v)=distance(S1(u1,v1),S2(u2,v2)) has an 
        --          extremum when gradient(F)=0. The algorithm searchs
        --          all the zeros inside the definition ranges of the 
        --          surfaces.
      	--          NbU and NbV are used to locate the close points on the
      	--          surface and NbT on the curve to find the zeros. 

    Create (C: Curve from Adaptor3d; S: Surface from Adaptor3d; 
    	    NbT,NbU,NbV: Integer; 
    	    tmin, tsup: Real; 
    	    Umin, Usup, Vmin, Vsup: Real; 
    	    Tol1,Tol2: Real)
    	returns GenExtCS;
      	---Purpose: It calculates all the distances.
        --          The function F(u,v)=distance(P,S(u,v)) has an 
        --          extremum when gradient(F)=0. The algorithm searchs
        --          all the zeros inside the definition ranges of the 
        --          surface.
      	--          NbT,NbU and NbV are used to locate the close points
      	--          to find the zeros. 
    
    Initialize(me: in out; S: Surface from Adaptor3d; 
    	       NbU, NbV: Integer; Tol2: Real)
    	---Pupose: sets the fields of the algorithm.
    is static;


    Initialize(me: in out; S: Surface from Adaptor3d; NbU, NbV: Integer; 
    	       Umin, Usup, Vmin, Vsup: Real; Tol2: Real)
    	---Pupose: sets the fields of the algorithm.
    is static;
    

    Perform(me: in out; C: Curve from Adaptor3d; 
    	    NbT: Integer; Tol1: Real)
        ---Purpose: the algorithm is done with S
        --          An exception is raised if the fields have not
        --          been initialized.  
    raises TypeMismatch from Standard
    is static;

    Perform(me: in out; C: Curve from Adaptor3d; NbT: Integer;
            tmin, tsup: Real; Tol1: Real)
        ---Purpose: the algorithm is done with C
        --          An exception is raised if the fields have not
        --          been initialized.  
    raises TypeMismatch from Standard
    is static;


    IsDone (me) returns Boolean
    	---Purpose: Returns True if the distances are found.
    	is static;
    
    NbExt (me) returns Integer
    	---Purpose: Returns the number of extremum distances.
    	raises  NotDone from StdFail
	    	-- if IsDone(me)=False.
    	is static;

    SquareDistance(me; N: Integer) returns Real
    	---Purpose: Returns the value of the Nth resulting square distance.
    	raises  NotDone from StdFail,
    	    	-- if IsDone(me)=False.
    	        OutOfRange
		-- if N < 1 or N > NbPoints(me).
    	is static;

    PointOnCurve (me; N: Integer) returns POnCurv
    	---Purpose: Returns the point of the Nth resulting distance.
    	---C++: return const&
    	raises  NotDone from StdFail,
    	    	-- if IsDone(me)=False.
    	        OutOfRange
		-- if N < 1 or N > NbPoints(me).
    	is static;

    PointOnSurface (me; N: Integer) returns POnSurf
    	---Purpose: Returns the point of the Nth resulting distance.
    	---C++: return const&
    	raises  NotDone from StdFail,
    	    	-- if IsDone(me)=False.
    	        OutOfRange
		-- if N < 1 or N > NbPoints(me).
    	is static;

    BidonCurve(me) returns CurvePtr from Adaptor3d
    is static private;

    BidonSurface(me) returns SurfacePtr from Adaptor3d
    is static private;

fields
    myDone     : Boolean;
    myInit     : Boolean;
    mytmin    : Real;
    mytsup    : Real;
    myumin    : Real;
    myusup    : Real;
    myvmin    : Real;
    myvsup    : Real;
    mytsample  : Integer;
    myusample  : Integer;
    myvsample  : Integer;
    mypoints1  : HArray1OfPnt from TColgp;
    mypoints2  : HArray2OfPnt from TColgp;
    mytol1     : Real;
    mytol2     : Real;
    myF	       : FuncExtCS from Extrema;
    myC        : CurvePtr from Adaptor3d;
    myS        : SurfacePtr from Adaptor3d;

end GenExtCS;