-- Created on: 1992-02-20
-- Created by: Remy GILET
-- Copyright (c) 1992-1999 Matra Datavision
-- Copyright (c) 1999-2014 OPEN CASCADE SAS
--
-- This file is part of Open CASCADE Technology software library.
--
-- This library is free software; you can redistribute it and/or modify it under
-- the terms of the GNU Lesser General Public License version 2.1 as published
-- by the Free Software Foundation, with special exception defined in the file
-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
-- distribution for complete text of the license and disclaimer of any warranty.
--
-- Alternatively, this file may be used under the terms of Open CASCADE
-- commercial license or contractual agreement.

generic class FunctionTanCuCu from GccIter (
    TheCurve     as any;
    TheCurveTool as any) -- as CurvePGTool from GccInt (TheCurve)

inherits FunctionSetWithDerivatives from math 

    ---Purpose: This abstract class describes a Function of 1 Variable 
    --          used to find a line tangent to two curves.

uses Vector from math,
     Matrix from math,
     Circ2d from gp,
     Pnt2d  from gp,
     Vec2d  from gp,
     Type3  from GccIter

     
raises ConstructionError

is

Create (Curv1 : TheCurve ;
        Curv2 : TheCurve ) returns FunctionTanCuCu from GccIter;

Create (Circ1 : Circ2d   from gp ;
        Curv2 : TheCurve         ) returns FunctionTanCuCu from GccIter;

InitDerivative(me                   : in out                      ;
    	       X                    :        Vector from math     ;
	       Point1,Point2        :    out Pnt2d  from gp       ;
	       Tan1,Tan2,D21,D22    :    out Vec2d  from gp       )
raises ConstructionError
is static;

NbVariables(me) returns Integer;
    ---Purpose: returns the number of variables of the function.

NbEquations(me) returns Integer;
    ---Purpose: returns the number of equations of the function.

Value (me : in out                 ;
       X  :        Vector from math;
       F  :    out Vector from math) returns Boolean;
    ---Purpose: Computes the value of the function F for the variable X.
    --          It returns True if the computation is successfully done,
    --          False otherwise.

Derivatives (me    : in out                 ;
             X     :        Vector from math;
             Deriv :    out Matrix from math) returns Boolean;
    ---Purpose: Computes the derivative of the function F for the variable X.
    --          It returns True if the computation is successfully done,
    --          False otherwise.

Values (me    : in out                 ;
        X     :        Vector from math;
        F     : out    Vector from math;
        Deriv : out    Matrix from math) returns Boolean;
    ---Purpose: Computes the value and the derivative of the function F 
    --          for the variable X.
    --          It returns True if the computation is successfully done,
    --          False otherwise.

fields

TheCurve1     : TheCurve               ;
TheCurve2     : TheCurve               ;
TheCirc1      : Circ2d   from gp       ;
TheType       : Type3    from GccIter  ;

end FunctionTanCuCu;