1 // Created on: 1993-12-24
2 // Created by: Jacques GOUSSARD
3 // Copyright (c) 1993-1999 Matra Datavision
4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
6 // This file is part of Open CASCADE Technology software library.
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.
14 // Alternatively, this file may be used under the terms of Open CASCADE
15 // commercial license or contractual agreement.
17 #ifndef _Law_Function_HeaderFile
18 #define _Law_Function_HeaderFile
20 #include <Standard.hxx>
21 #include <Standard_Type.hxx>
23 #include <Standard_Transient.hxx>
24 #include <GeomAbs_Shape.hxx>
25 #include <Standard_Integer.hxx>
26 #include <TColStd_Array1OfReal.hxx>
27 #include <Standard_Real.hxx>
28 class Standard_OutOfRange;
32 DEFINE_STANDARD_HANDLE(Law_Function, Standard_Transient)
34 //! Root class for evolution laws.
35 class Law_Function : public Standard_Transient
41 Standard_EXPORT virtual GeomAbs_Shape Continuity() const = 0;
43 //! Returns the number of intervals for continuity
44 //! <S>. May be one if Continuity(me) >= <S>
45 Standard_EXPORT virtual Standard_Integer NbIntervals (const GeomAbs_Shape S) const = 0;
47 //! Stores in <T> the parameters bounding the intervals
48 //! of continuity <S>.
50 //! The array must provide enough room to accomodate
51 //! for the parameters. i.e. T.Length() > NbIntervals()
52 Standard_EXPORT virtual void Intervals (TColStd_Array1OfReal& T, const GeomAbs_Shape S) const = 0;
54 //! Returns the value of the function at the point of parameter X.
55 Standard_EXPORT virtual Standard_Real Value (const Standard_Real X) = 0;
57 //! Returns the value F and the first derivative D of the
58 //! function at the point of parameter X.
59 Standard_EXPORT virtual void D1 (const Standard_Real X, Standard_Real& F, Standard_Real& D) = 0;
61 //! Returns the value, first and seconde derivatives
63 Standard_EXPORT virtual void D2 (const Standard_Real X, Standard_Real& F, Standard_Real& D, Standard_Real& D2) = 0;
65 //! Returns a law equivalent of <me> between
66 //! parameters <First> and <Last>. <Tol> is used to
67 //! test for 3d points confusion.
68 //! It is usfule to determines the derivatives
69 //! in these values <First> and <Last> if
70 //! the Law is not Cn.
71 Standard_EXPORT virtual Handle(Law_Function) Trim (const Standard_Real PFirst, const Standard_Real PLast, const Standard_Real Tol) const = 0;
73 //! Returns the parametric bounds of the function.
74 Standard_EXPORT virtual void Bounds (Standard_Real& PFirst, Standard_Real& PLast) = 0;
79 DEFINE_STANDARD_RTTIEXT(Law_Function,Standard_Transient)
99 #endif // _Law_Function_HeaderFile