include/opencascade/Law_BSpFunc.hxx

0001 // Created on: 1995-11-15
0002 // Created by: Laurent BOURESCHE
0003 // Copyright (c) 1995-1999 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 _Law_BSpFunc_HeaderFile
0018 #define _Law_BSpFunc_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_Type.hxx>
0022
0023 #include <Law_Function.hxx>
0024 #include <GeomAbs_Shape.hxx>
0025 #include <Standard_Integer.hxx>
0026 #include <NCollection_Array1.hxx>
0027 class Law_BSpline;
0028
0029 //! Law Function based on a BSpline curve 1d. Package
0030 //! methods and classes are implemented in package Law
0031 //! to construct the basis curve with several
0032 //! constraints.
0033 class Law_BSpFunc : public Law_Function
0034 {
0035
0036 public:
0037   Standard_EXPORT Law_BSpFunc();
0038
0039   Standard_EXPORT Law_BSpFunc(const occ::handle<Law_BSpline>& C,
0040                               const double                    First,
0041                               const double                    Last);
0042
0043   Standard_EXPORT GeomAbs_Shape Continuity() const override;
0044
0045   //! Returns the number of intervals for continuity
0046   //! <S>. May be one if Continuity(me) >= <S>
0047   Standard_EXPORT int NbIntervals(const GeomAbs_Shape S) const override;
0048
0049   //! Stores in <T> the parameters bounding the intervals of continuity <S>.
0050   //! The array must provide enough room to accommodate for the parameters, i.e. T.Length() >
0051   //! NbIntervals()
0052   Standard_EXPORT void Intervals(NCollection_Array1<double>& T,
0053                                  const GeomAbs_Shape         S) const override;
0054
0055   Standard_EXPORT double Value(const double X) override;
0056
0057   Standard_EXPORT void D1(const double X, double& F, double& D) override;
0058
0059   Standard_EXPORT void D2(const double X, double& F, double& D, double& D2) override;
0060
0061   //! Returns a law equivalent of <me> between
0062   //! parameters <First> and <Last>. <Tol> is used to
0063   //! test for 3d points confusion.
0064   //! It is usfule to determines the derivatives
0065   //! in these values <First> and <Last> if
0066   //! the Law is not Cn.
0067   Standard_EXPORT occ::handle<Law_Function> Trim(const double PFirst,
0068                                                  const double PLast,
0069                                                  const double Tol) const override;
0070
0071   Standard_EXPORT void Bounds(double& PFirst, double& PLast) override;
0072
0073   Standard_EXPORT occ::handle<Law_BSpline> Curve() const;
0074
0075   Standard_EXPORT void SetCurve(const occ::handle<Law_BSpline>& C);
0076
0077   DEFINE_STANDARD_RTTIEXT(Law_BSpFunc, Law_Function)
0078
0079 private:
0080   occ::handle<Law_BSpline> curv;
0081   double                   first;
0082   double                   last;
0083 };
0084
0085 #endif // _Law_BSpFunc_HeaderFile