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 // Created on: 1997-01-17
 // Created by: Philippe MANGIN
 // Copyright (c) 1997-1999 Matra Datavision
 // Copyright (c) 1999-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _Law_BSplineKnotSplitting_HeaderFile
 #define _Law_BSplineKnotSplitting_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <TColStd_HArray1OfInteger.hxx>
 #include <Standard_Integer.hxx>
 #include <TColStd_Array1OfInteger.hxx>
 class Law_BSpline;
 
 
 
 //! For a B-spline curve the discontinuities are localised at the
 //! knot values and between two knots values the B-spline is
 //! infinitely continuously differentiable.
 //! At a knot of range index the continuity is equal to :
 //! Degree - Mult (Index)   where  Degree is the degree of the
 //! basis B-spline functions and Mult the multiplicity of the knot
 //! of range Index.
 //! If for your computation you need to have B-spline curves with a
 //! minima of continuity it can be interesting to know between which
 //! knot values, a B-spline curve arc, has a continuity of given order.
 //! This algorithm computes the indexes of the knots where you should
 //! split the curve, to obtain arcs with a constant continuity given
 //! at the construction time. The splitting values are in the range
 //! [FirstUKnotValue, LastUKnotValue] (See class B-spline curve from
 //! package Geom).
 //! If you just want to compute the local derivatives on the curve you
 //! don't need to create the B-spline curve arcs, you can use the
 //! functions LocalD1, LocalD2, LocalD3, LocalDN of the class
 //! BSplineCurve.
 class Law_BSplineKnotSplitting 
 {
 public:
 
   DEFINE_STANDARD_ALLOC
 
   
 
   //! Locates the knot values which correspond to the segmentation of
   //! the curve into arcs with a continuity equal to ContinuityRange.
   //!
   //! Raised if ContinuityRange is not greater or equal zero.
   Standard_EXPORT Law_BSplineKnotSplitting(const Handle(Law_BSpline)& BasisLaw, const Standard_Integer ContinuityRange);
   
 
   //! Returns the number of knots corresponding to the splitting.
   Standard_EXPORT Standard_Integer NbSplits() const;
   
 
   //! Returns the indexes of the BSpline curve knots corresponding to
   //! the splitting.
   //!
   //! Raised if the length of SplitValues is not equal to NbSPlit.
   Standard_EXPORT void Splitting (TColStd_Array1OfInteger& SplitValues) const;
   
 
   //! Returns the index of the knot corresponding to the splitting
   //! of range Index.
   //!
   //! Raised if Index < 1 or Index > NbSplits
   Standard_EXPORT Standard_Integer SplitValue (const Standard_Integer Index) const;
 
 
 
 
 protected:
 
 
 
 
 
 private:
 
 
 
   Handle(TColStd_HArray1OfInteger) splitIndexes;
 
 
 };
 
 
 
 
 
 
 
 #endif // _Law_BSplineKnotSplitting_HeaderFile

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