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 // Created on: 1991-10-03
 // Copyright (c) 1991-1999 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 _Geom2dConvert_BSplineCurveKnotSplitting_HeaderFile
 #define _Geom2dConvert_BSplineCurveKnotSplitting_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <Standard_Integer.hxx>
 #include <NCollection_Array1.hxx>
 #include <NCollection_HArray1.hxx>
 class Geom2d_BSplineCurve;
 
 //! An algorithm to determine points at which a BSpline
 //! curve should be split in order to obtain arcs of the same continuity.
 //! If you require curves with a minimum continuity for
 //! your computation, it is useful to know the points
 //! between which an arc has a continuity of a given
 //! order. The continuity order is given at the construction time.
 //! For a BSpline curve, the discontinuities are
 //! localized at the knot values. Between two knot values
 //! the BSpline is infinitely and continuously
 //! differentiable. At a given knot, the continuity is equal
 //! to: Degree - Mult, where Degree is the
 //! degree of the BSpline curve and Mult is the multiplicity of the knot.
 //! It is possible to compute the arcs which correspond to
 //! this splitting using the global function
 //! SplitBSplineCurve provided by the package Geom2dConvert.
 //! A BSplineCurveKnotSplitting object provides a framework for:
 //! -   defining the curve to be analysed and the required degree of continuity,
 //! -   implementing the computation algorithm, and
 //! -   consulting the results.
 class Geom2dConvert_BSplineCurveKnotSplitting
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Determines points at which the BSpline curve
   //! BasisCurve should be split in order to obtain arcs
   //! with a degree of continuity equal to ContinuityRange.
   //! These points are knot values of BasisCurve. They
   //! are identified by indices in the knots table of BasisCurve.
   //! Use the available interrogation functions to access
   //! computed values, followed by the global function
   //! SplitBSplineCurve (provided by the package
   //! Geom2dConvert) to split the curve.
   //! Exceptions
   //! Standard_RangeError if ContinuityRange is less than zero.
   Standard_EXPORT Geom2dConvert_BSplineCurveKnotSplitting(
     const occ::handle<Geom2d_BSplineCurve>& BasisCurve,
     const int                               ContinuityRange);
 
   //! Returns the number of points at which the analysed
   //! BSpline curve should be split, in order to obtain arcs
   //! with the continuity required by this framework.
   //! All these points correspond to knot values. Note that
   //! the first and last points of the curve, which bound the
   //! first and last arcs, are counted among these splitting points.
   Standard_EXPORT int NbSplits() const;
 
   //! Loads the SplitValues table with the split knots
   //! values computed in this framework. Each value in the
   //! table is an index in the knots table of the BSpline
   //! curve analysed by this algorithm.
   //! The values in SplitValues are given in ascending
   //! order and comprise the indices of the knots which
   //! give the first and last points of the curve. Use two
   //! consecutive values from the table as arguments of the
   //! global function SplitBSplineCurve (provided by the
   //! package Geom2dConvert) to split the curve.
   //! Exceptions
   //! Standard_DimensionError if the array SplitValues
   //! was not created with the following bounds:
   //! -   1, and
   //! -   the number of split points computed in this
   //! framework (as given by the function NbSplits).
   Standard_EXPORT void Splitting(NCollection_Array1<int>& SplitValues) const;
 
   //! Returns the split knot of index Index to the split knots
   //! table computed in this framework. The returned value
   //! is an index in the knots table of the BSpline curve
   //! analysed by this algorithm.
   //! Notes:
   //! -   If Index is equal to 1, the corresponding knot
   //! gives the first point of the curve.
   //! -   If Index is equal to the number of split knots
   //! computed in this framework, the corresponding
   //! point is the last point of the curve.
   //! Exceptions
   //! Standard_RangeError if Index is less than 1 or
   //! greater than the number of split knots computed in this framework.
   Standard_EXPORT int SplitValue(const int Index) const;
 
 private:
   occ::handle<NCollection_HArray1<int>> splitIndexes;
 };
 
 #endif // _Geom2dConvert_BSplineCurveKnotSplitting_HeaderFile

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