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 // Created on: 1991-10-10
 // Created by: Jean Claude VAUTHIER
 // 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 _Convert_ConicToBSplineCurve_HeaderFile
 #define _Convert_ConicToBSplineCurve_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <TColgp_HArray1OfPnt2d.hxx>
 #include <TColStd_HArray1OfReal.hxx>
 #include <TColStd_HArray1OfInteger.hxx>
 #include <Standard_Integer.hxx>
 #include <Convert_ParameterisationType.hxx>
 class gp_Pnt2d;
 
 //! Root class for algorithms which convert a conic curve into
 //! a BSpline curve (CircleToBSplineCurve, EllipseToBSplineCurve,
 //! HyperbolaToBSplineCurve, ParabolaToBSplineCurve).
 //! These algorithms all work on 2D curves from the gp
 //! package and compute all the data needed to construct a
 //! BSpline curve equivalent to the conic curve. This data consists of:
 //! -   the degree of the curve,
 //! -   the periodic characteristics of the curve,
 //! -   a poles table with associated weights,
 //! -   a knots table with associated multiplicities.
 //! The abstract class ConicToBSplineCurve provides a
 //! framework for storing and consulting this computed data.
 //! The data may then be used to construct a
 //! Geom2d_BSplineCurve curvSuper class of the following classes :
 //! This abstract class implements the methods to get the geometric
 //! representation of the B-spline curve equivalent to the conic.
 //! The B-spline is computed at the creation time in the sub classes.
 //! The B-spline curve is defined with its degree, its control points
 //! (Poles), its weights, its knots and their multiplicity.
 //! All the geometric entities used in this package are defined in 2D
 //! space.
 //! KeyWords :
 //! Convert, Conic, BSplineCurve, 2D.
 class Convert_ConicToBSplineCurve
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Returns the degree of the BSpline curve whose data is
   //! computed in this framework.
   Standard_EXPORT Standard_Integer Degree() const;
 
   //! Returns the number of poles of the BSpline curve whose
   //! data is computed in this framework.
   Standard_EXPORT Standard_Integer NbPoles() const;
 
   //! Returns the number of knots of the BSpline curve whose
   //! data is computed in this framework.
   Standard_EXPORT Standard_Integer NbKnots() const;
 
   //! Returns true if the BSpline curve whose data is computed in
   //! this framework is periodic.
   Standard_EXPORT Standard_Boolean IsPeriodic() const;
 
   //! Returns the pole of index Index to the poles table of the
   //! BSpline curve whose data is computed in this framework.
   //! Exceptions
   //! Standard_OutOfRange if Index is outside the bounds of
   //! the poles table of the BSpline curve whose data is computed in this framework.
   Standard_EXPORT gp_Pnt2d Pole(const Standard_Integer Index) const;
 
   //! Returns the weight of the pole of index Index to the poles
   //! table of the BSpline curve whose data is computed in this framework.
   //! Exceptions
   //! Standard_OutOfRange if Index is outside the bounds of
   //! the poles table of the BSpline curve whose data is computed in this framework.
   Standard_EXPORT Standard_Real Weight(const Standard_Integer Index) const;
 
   //! Returns the knot of index Index to the knots table of the
   //! BSpline curve whose data is computed in this framework.
   //! Exceptions
   //! Standard_OutOfRange if Index is outside the bounds of
   //! the knots table of the BSpline curve whose data is computed in this framework.
   Standard_EXPORT Standard_Real Knot(const Standard_Integer Index) const;
 
   //! Returns the multiplicity of the knot of index Index to the
   //! knots table of the BSpline curve whose data is computed in this framework.
   //! Exceptions
   //! Standard_OutOfRange if Index is outside the bounds of
   //! the knots table of the BSpline curve whose data is computed in this framework.
   Standard_EXPORT Standard_Integer Multiplicity(const Standard_Integer Index) const;
 
   Standard_EXPORT void BuildCosAndSin(const Convert_ParameterisationType Parametrisation,
                                       Handle(TColStd_HArray1OfReal)&     CosNumerator,
                                       Handle(TColStd_HArray1OfReal)&     SinNumerator,
                                       Handle(TColStd_HArray1OfReal)&     Denominator,
                                       Standard_Integer&                  Degree,
                                       Handle(TColStd_HArray1OfReal)&     Knots,
                                       Handle(TColStd_HArray1OfInteger)&  Mults) const;
 
   Standard_EXPORT void BuildCosAndSin(const Convert_ParameterisationType Parametrisation,
                                       const Standard_Real                UFirst,
                                       const Standard_Real                ULast,
                                       Handle(TColStd_HArray1OfReal)&     CosNumerator,
                                       Handle(TColStd_HArray1OfReal)&     SinNumerator,
                                       Handle(TColStd_HArray1OfReal)&     Denominator,
                                       Standard_Integer&                  Degree,
                                       Handle(TColStd_HArray1OfReal)&     Knots,
                                       Handle(TColStd_HArray1OfInteger)&  Mults) const;
 
 protected:
   Standard_EXPORT Convert_ConicToBSplineCurve(const Standard_Integer NumberOfPoles,
                                               const Standard_Integer NumberOfKnots,
                                               const Standard_Integer Degree);
 
   Handle(TColgp_HArray1OfPnt2d)    poles;
   Handle(TColStd_HArray1OfReal)    weights;
   Handle(TColStd_HArray1OfReal)    knots;
   Handle(TColStd_HArray1OfInteger) mults;
   Standard_Integer                 degree;
   Standard_Integer                 nbPoles;
   Standard_Integer                 nbKnots;
   Standard_Boolean                 isperiodic;
 
 private:
 };
 
 #endif // _Convert_ConicToBSplineCurve_HeaderFile

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