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 // Created on: 1996-03-12
 // Created by: Bruno DUMORTIER
 // Copyright (c) 1996-1999 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 _GeomConvert_BSplineCurveToBezierCurve_HeaderFile
 #define _GeomConvert_BSplineCurveToBezierCurve_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <Standard_Integer.hxx>
 #include <Geom_BezierCurve.hxx>
 #include <NCollection_Array1.hxx>
 class Geom_BSplineCurve;
 class Geom_BezierCurve;
 
 //! An algorithm to convert a BSpline curve into a series
 //! of adjacent Bezier curves.
 //! A BSplineCurveToBezierCurve object provides a framework for:
 //! -   defining the BSpline curve to be converted
 //! -   implementing the construction algorithm, and
 //! -   consulting the results.
 //! References :
 //! Generating the Bezier points of B-spline curves and surfaces
 //! (Wolfgang Bohm) CAD volume 13 number 6 november 1981
 class GeomConvert_BSplineCurveToBezierCurve
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Computes all the data needed to convert the
   //! BSpline curve BasisCurve into a series of adjacent Bezier arcs.
   Standard_EXPORT GeomConvert_BSplineCurveToBezierCurve(
     const occ::handle<Geom_BSplineCurve>& BasisCurve);
 
   //! Computes all the data needed to convert
   //! the portion of the BSpline curve BasisCurve
   //! limited by the two parameter values U1 and U2 into a series of adjacent Bezier arcs.
   //! The result consists of a series of BasisCurve arcs
   //! limited by points corresponding to knot values of the curve.
   //! Use the available interrogation functions to ascertain
   //! the number of computed Bezier arcs, and then to
   //! construct each individual Bezier curve (or all Bezier curves).
   //! Note: ParametricTolerance is not used.
   //! Raises DomainError if U1 or U2 are out of the parametric bounds of the basis
   //! curve [FirstParameter, LastParameter]. The Tolerance criterion
   //! is ParametricTolerance.
   //! Raised if Abs (U2 - U1) <= ParametricTolerance.
   Standard_EXPORT GeomConvert_BSplineCurveToBezierCurve(
     const occ::handle<Geom_BSplineCurve>& BasisCurve,
     const double                          U1,
     const double                          U2,
     const double                          ParametricTolerance);
 
   //! Constructs and returns the Bezier curve of index
   //! Index to the table of adjacent Bezier arcs
   //! computed by this algorithm.
   //! This Bezier curve has the same orientation as the
   //! BSpline curve analyzed in this framework.
   //! Exceptions
   //! Standard_OutOfRange if Index is less than 1 or
   //! greater than the number of adjacent Bezier arcs
   //! computed by this algorithm.
   Standard_EXPORT occ::handle<Geom_BezierCurve> Arc(const int Index);
 
   //! Constructs all the Bezier curves whose data is
   //! computed by this algorithm and loads these curves into the Curves table.
   //! The Bezier curves have the same orientation as the
   //! BSpline curve analyzed in this framework.
   //! Exceptions
   //! Standard_DimensionError if the Curves array was
   //! not created with the following bounds:
   //! -   1 , and
   //! -   the number of adjacent Bezier arcs computed by
   //! this algorithm (as given by the function NbArcs).
   Standard_EXPORT void Arcs(NCollection_Array1<occ::handle<Geom_BezierCurve>>& Curves);
 
   //! This methode returns the bspline's knots associated to
   //! the converted arcs
   //! Raised if the length of Curves is not equal to
   //! NbArcs + 1
   Standard_EXPORT void Knots(NCollection_Array1<double>& TKnots) const;
 
   //! Returns the number of BezierCurve arcs.
   //! If at the creation time you have decomposed the basis curve
   //! between the parametric values UFirst, ULast the number of
   //! BezierCurve arcs depends on the number of knots included inside
   //! the interval [UFirst, ULast].
   //! If you have decomposed the whole basis B-spline curve the number
   //! of BezierCurve arcs NbArcs is equal to the number of knots less
   //! one.
   Standard_EXPORT int NbArcs() const;
 
 private:
   occ::handle<Geom_BSplineCurve> myCurve;
 };
 
 #endif // _GeomConvert_BSplineCurveToBezierCurve_HeaderFile

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