include/opencascade/Geom2dEvaluator.hxx

0001 // Created on: 1992-08-28
0002 // Created by: Remi LEQUETTE
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 _Geom2dEvaluator_HeaderFile
0018 #define _Geom2dEvaluator_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_DefineAlloc.hxx>
0022
0023 class gp_Pnt2d;
0024 class gp_Vec2d;
0025
0026 //! The Geom2dEvaluator package provides  utilities for .
0027 //! calculating value and derivatives of offset curve
0028 //! using corresponding values of base curve
0029
0030 class Geom2dEvaluator
0031 {
0032 public:
0033
0034   DEFINE_STANDARD_ALLOC
0035
0036
0037   //! Recalculate D1 values of base curve into D0 value of offset curve
0038   Standard_EXPORT static void CalculateD0(gp_Pnt2d& theValue,
0039                                           const gp_Vec2d& theD1, const Standard_Real theOffset);
0040
0041   //! Recalculate D2 values of base curve into D1 values of offset curve
0042   Standard_EXPORT static  void CalculateD1(gp_Pnt2d& theValue,
0043                                            gp_Vec2d& theD1,
0044                                            const gp_Vec2d& theD2, const Standard_Real theOffset);
0045
0046
0047   //! Recalculate D3 values of base curve into D2 values of offset curve
0048   Standard_EXPORT static   void CalculateD2(gp_Pnt2d& theValue,
0049                                             gp_Vec2d& theD1,
0050                                             gp_Vec2d& theD2,
0051                                             const gp_Vec2d& theD3, const Standard_Boolean theIsDirChange,
0052                                             const Standard_Real theOffset);
0053
0054
0055   //! Recalculate D3 values of base curve into D3 values of offset curve
0056   Standard_EXPORT static void CalculateD3(gp_Pnt2d& theValue,
0057                                           gp_Vec2d& theD1,
0058                                           gp_Vec2d& theD2,
0059                                           gp_Vec2d& theD3,
0060                                           const gp_Vec2d& theD4, const Standard_Boolean theIsDirChange,
0061                                           const Standard_Real theOffset);
0062
0063
0064   //! Recalculate derivatives in the singular point
0065   //! Returns true if the direction of derivatives is changed
0066   Standard_EXPORT static Standard_Boolean AdjustDerivative(const Standard_Integer theMaxDerivative,
0067                                                            const Standard_Real theU,
0068                                                            gp_Vec2d& theD1,
0069                                                            gp_Vec2d& theD2,
0070                                                            gp_Vec2d& theD3,
0071                                                            gp_Vec2d& theD4);
0072
0073
0074 protected:
0075
0076
0077
0078
0079
0080 private:
0081
0082 };
0083
0084
0085 #endif // _Geom2dEvaluator_HeaderFile