include/opencascade/GeomLib_DenominatorMultiplier.hxx

0001 // Created on: 1997-05-13
0002 // Created by: Stagiaire Francois DUMONT
0003 // Copyright (c) 1997-1999 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 _GeomLib_DenominatorMultiplier_HeaderFile
0018 #define _GeomLib_DenominatorMultiplier_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_DefineAlloc.hxx>
0022 #include <Standard_Handle.hxx>
0023
0024 #include <TColStd_Array1OfReal.hxx>
0025 #include <Standard_Real.hxx>
0026 class Geom_BSplineSurface;
0027
0028
0029 //! this defines an evaluator for a function of 2 variables
0030 //! that will be used by CancelDenominatorDerivative in one
0031 //! direction.
0032 class GeomLib_DenominatorMultiplier
0033 {
0034 public:
0035
0036   DEFINE_STANDARD_ALLOC
0037
0038
0039   //! if the surface is rational this will define the evaluator
0040   //! of a real function of 2 variables a(u,v) such that
0041   //! if we define a new surface by :
0042   //! a(u,v) * N(u,v)
0043   //! NewF(u,v) = ----------------
0044   //! a(u,v) * D(u,v)
0045   Standard_EXPORT GeomLib_DenominatorMultiplier(const Handle(Geom_BSplineSurface)& Surface, const TColStd_Array1OfReal& KnotVector);
0046
0047   //! Returns the value of
0048   //! a(UParameter,VParameter)=
0049   //!
0050   //! H0(UParameter)/Denominator(Umin,Vparameter)
0051   //!
0052   //! D Denominator(Umin,Vparameter)
0053   //! - ------------------------------[H1(u)]/(Denominator(Umin,Vparameter)^2)
0054   //! D U
0055   //!
0056   //! + H3(UParameter)/Denominator(Umax,Vparameter)
0057   //!
0058   //! D Denominator(Umax,Vparameter)
0059   //! - ------------------------------[H2(u)]/(Denominator(Umax,Vparameter)^2)
0060   //! D U
0061   Standard_EXPORT Standard_Real Value (const Standard_Real UParameter, const Standard_Real VParameter) const;
0062
0063
0064
0065
0066 protected:
0067
0068
0069
0070
0071
0072 private:
0073
0074
0075
0076   Handle(Geom_BSplineSurface) mySurface;
0077   TColStd_Array1OfReal myKnotFlatVector;
0078
0079
0080 };
0081
0082
0083
0084
0085
0086
0087
0088 #endif // _GeomLib_DenominatorMultiplier_HeaderFile