include/opencascade/Geom2dGcc_FunctionTanCuPnt.hxx

0001 // Created on: 1992-02-20
0002 // Created by: Remy GILET
0003 // Copyright (c) 1992-1999 Matra Datavision
0004 // Copyright (c) 1999-2014 OPEN CASCADE SAS
0005 //
0006 // This file is part of Open CASCADE Technology software library.
0007 //
0008 // This library is free software; you can redistribute it and/or modify it under
0009 // the terms of the GNU Lesser General Public License version 2.1 as published
0010 // by the Free Software Foundation, with special exception defined in the file
0011 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0012 // distribution for complete text of the license and disclaimer of any warranty.
0013 //
0014 // Alternatively, this file may be used under the terms of Open CASCADE
0015 // commercial license or contractual agreement.
0016
0017 #ifndef _Geom2dGcc_FunctionTanCuPnt_HeaderFile
0018 #define _Geom2dGcc_FunctionTanCuPnt_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_DefineAlloc.hxx>
0022 #include <Standard_Handle.hxx>
0023
0024 #include <Geom2dAdaptor_Curve.hxx>
0025 #include <gp_Pnt2d.hxx>
0026 #include <math_FunctionWithDerivative.hxx>
0027
0028
0029 //! This abstract class describes a Function of 1 Variable
0030 //! used to find a line tangent to a curve and passing
0031 //! through a point.
0032 class Geom2dGcc_FunctionTanCuPnt  : public math_FunctionWithDerivative
0033 {
0034 public:
0035
0036   DEFINE_STANDARD_ALLOC
0037
0038
0039   Standard_EXPORT Geom2dGcc_FunctionTanCuPnt(const Geom2dAdaptor_Curve& C, const gp_Pnt2d& Point);
0040
0041   //! Computes the value of the function F for the variable X.
0042   //! It returns True if the computation is successfully done,
0043   //! False otherwise.
0044   Standard_EXPORT Standard_Boolean Value (const Standard_Real X, Standard_Real& F);
0045
0046   //! Computes the derivative of the function F for the variable X.
0047   //! It returns True if the computation is successfully done,
0048   //! False otherwise.
0049   Standard_EXPORT Standard_Boolean Derivative (const Standard_Real X, Standard_Real& Deriv);
0050
0051   //! Computes the value and the derivative of the function F
0052   //! for the variable X.
0053   //! It returns True if the computation is successfully done,
0054   //! False otherwise.
0055   Standard_EXPORT Standard_Boolean Values (const Standard_Real X, Standard_Real& F, Standard_Real& Deriv);
0056
0057
0058
0059
0060 protected:
0061
0062
0063
0064
0065
0066 private:
0067
0068
0069
0070   Geom2dAdaptor_Curve TheCurv;
0071   gp_Pnt2d ThePoint;
0072
0073
0074 };
0075
0076
0077
0078
0079
0080
0081
0082 #endif // _Geom2dGcc_FunctionTanCuPnt_HeaderFile