src/Geom2dEvaluator/Geom2dEvaluator.hxx

   1 // Created on: 1992-08-28
   2 // Created by: Remi LEQUETTE
   3 // Copyright (c) 1992-1999 Matra Datavision
   4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
   5 //
   6 // This file is part of Open CASCADE Technology software library.
   7 //
   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.
  13 //
  14 // Alternatively, this file may be used under the terms of Open CASCADE
  15 // commercial license or contractual agreement.
  16
  17 #ifndef _Geom2dEvaluator_HeaderFile
  18 #define _Geom2dEvaluator_HeaderFile
  19
  20 #include <Standard.hxx>
  21 #include <Standard_DefineAlloc.hxx>
  22 #include <Standard_Real.hxx>
  23 #include <Standard_Integer.hxx>
  24
  25 class gp_Pnt2d;
  26 class gp_Vec2d;
  27
  28 //! The Geom2dEvaluator package provides  utilities for .
  29 //! calculating value and derivatives of offset curve
  30 //! using corresponding values of base curve
  31
  32 class Geom2dEvaluator
  33 {
  34 public:
  35
  36   DEFINE_STANDARD_ALLOC
  37
  38
  39   //! Recalculate D1 values of base curve into D0 value of offset curve
  40   Standard_EXPORT static void CalculateD0(gp_Pnt2d& theValue,
  41                                           const gp_Vec2d& theD1, const Standard_Real theOffset);
  42
  43   //! Recalculate D2 values of base curve into D1 values of offset curve
  44   Standard_EXPORT static  void CalculateD1(gp_Pnt2d& theValue,
  45                                            gp_Vec2d& theD1,
  46                                            const gp_Vec2d& theD2, const Standard_Real theOffset);
  47
  48
  49   //! Recalculate D3 values of base curve into D2 values of offset curve
  50   Standard_EXPORT static   void CalculateD2(gp_Pnt2d& theValue,
  51                                             gp_Vec2d& theD1,
  52                                             gp_Vec2d& theD2,
  53                                             const gp_Vec2d& theD3, const Standard_Boolean theIsDirChange,
  54                                             const Standard_Real theOffset);
  55
  56
  57   //! Recalculate D3 values of base curve into D3 values of offset curve
  58   Standard_EXPORT static void CalculateD3(gp_Pnt2d& theValue,
  59                                           gp_Vec2d& theD1,
  60                                           gp_Vec2d& theD2,
  61                                           gp_Vec2d& theD3,
  62                                           const gp_Vec2d& theD4, const Standard_Boolean theIsDirChange,
  63                                           const Standard_Real theOffset);
  64
  65
  66   //! Recalculate derivatives in the singular point
  67   //! Returns true if the direction of derivatives is changed
  68   Standard_EXPORT static Standard_Boolean AdjustDerivative(const Standard_Integer theMaxDerivative,
  69                                                            const Standard_Real theU,
  70                                                            gp_Vec2d& theD1,
  71                                                            gp_Vec2d& theD2,
  72                                                            gp_Vec2d& theD3,
  73                                                            gp_Vec2d& theD4);
  74
  75
  76 protected:
  77
  78
  79
  80
  81
  82 private:
  83
  84 };
  85
  86
  87 #endif // _Geom2dEvaluator_HeaderFile