1 // Created on: 1992-02-20
2 // Created by: Remy GILET
3 // Copyright (c) 1992-1999 Matra Datavision
4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
6 // This file is part of Open CASCADE Technology software library.
8 // This library is free software; you can redistribute it and/or modify it under
9 // the terms of the GNU Lesser General Public License version 2.1 as published
10 // by the Free Software Foundation, with special exception defined in the file
11 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
12 // distribution for complete text of the license and disclaimer of any warranty.
14 // Alternatively, this file may be used under the terms of Open CASCADE
15 // commercial license or contractual agreement.
17 #ifndef _Geom2dGcc_FunctionTanCuPnt_HeaderFile
18 #define _Geom2dGcc_FunctionTanCuPnt_HeaderFile
20 #include <Standard.hxx>
21 #include <Standard_DefineAlloc.hxx>
22 #include <Standard_Handle.hxx>
24 #include <Geom2dAdaptor_Curve.hxx>
25 #include <gp_Pnt2d.hxx>
26 #include <math_FunctionWithDerivative.hxx>
27 #include <Standard_Boolean.hxx>
28 #include <Standard_Real.hxx>
29 class Geom2dAdaptor_Curve;
33 //! This abstract class describes a Function of 1 Variable
34 //! used to find a line tangent to a curve and passing
36 class Geom2dGcc_FunctionTanCuPnt : public math_FunctionWithDerivative
43 Standard_EXPORT Geom2dGcc_FunctionTanCuPnt(const Geom2dAdaptor_Curve& C, const gp_Pnt2d& Point);
45 //! Computes the value of the function F for the variable X.
46 //! It returns True if the computation is successfully done,
48 Standard_EXPORT Standard_Boolean Value (const Standard_Real X, Standard_Real& F);
50 //! Computes the derivative of the function F for the variable X.
51 //! It returns True if the computation is successfully done,
53 Standard_EXPORT Standard_Boolean Derivative (const Standard_Real X, Standard_Real& Deriv);
55 //! Computes the value and the derivative of the function F
56 //! for the variable X.
57 //! It returns True if the computation is successfully done,
59 Standard_EXPORT Standard_Boolean Values (const Standard_Real X, Standard_Real& F, Standard_Real& Deriv);
74 Geom2dAdaptor_Curve TheCurv;
86 #endif // _Geom2dGcc_FunctionTanCuPnt_HeaderFile