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 // Created on: 1993-09-20
 // Created by: Modelistation
 // Copyright (c) 1993-1999 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 _AppParCurves_MultiBSpCurve_HeaderFile
 #define _AppParCurves_MultiBSpCurve_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <NCollection_Array1.hxx>
 #include <NCollection_HArray1.hxx>
 #include <Standard_Integer.hxx>
 #include <AppParCurves_MultiCurve.hxx>
 #include <AppParCurves_MultiPoint.hxx>
 #include <Standard_OStream.hxx>
 class gp_Pnt;
 class gp_Pnt2d;
 class gp_Vec;
 class gp_Vec2d;
 
 //! This class describes a MultiBSpCurve approximating a Multiline.
 //! Just as a Multiline is a set of a given number of lines, a MultiBSpCurve is a set
 //! of a specified number of bsplines defined by:
 //! -   A specified number of MultiPoints - the poles of a specified number of curves
 //! -   The degree of approximation identical for each of the specified number of curves.
 //!
 //! Example of a MultiBSpCurve composed of a specified number of MultiPoints:
 //!
 //! P1______P2_____P3______P4________........_____PNbMPoints
 //!
 //! Q1______Q2_____Q3______Q4________........_____QNbMPoints
 //! .                                               .
 //! .                                               .
 //! .                                               .
 //! R1______R2_____R3______R4________........_____RNbMPoints
 //!
 //! Pi, Qi, ..., Ri are points of dimension 2 or 3.
 //!
 //! (Pi, Qi, ...Ri), i= 1,...NbPoles are MultiPoints.
 //! each MultiPoint has got NbPol Poles.
 //! MultiBSpCurves are created by the SplineValue method in the ComputeLine
 //! class, and by the Value method in TheVariational class. MultiBSpCurve
 //! provides the information required to create the BSpline defined by the approximation.
 class AppParCurves_MultiBSpCurve : public AppParCurves_MultiCurve
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! returns an indefinite MultiBSpCurve.
   Standard_EXPORT AppParCurves_MultiBSpCurve();
 
   //! creates a MultiBSpCurve, describing BSpline curves all
   //! containing the same number of MultiPoint.
   //! An exception is raised if Degree < 0.
   Standard_EXPORT AppParCurves_MultiBSpCurve(const int NbPol);
 
   //! creates a MultiBSpCurve, describing BSpline curves all
   //! containing the same number of MultiPoint.
   //! Each MultiPoint must have NbCurves Poles.
   Standard_EXPORT AppParCurves_MultiBSpCurve(
     const NCollection_Array1<AppParCurves_MultiPoint>& tabMU,
     const NCollection_Array1<double>&                  Knots,
     const NCollection_Array1<int>&                     Mults);
 
   //! creates a MultiBSpCurve, describing BSpline
   //! curves, taking control points from <SC>.
   Standard_EXPORT AppParCurves_MultiBSpCurve(const AppParCurves_MultiCurve&    SC,
                                              const NCollection_Array1<double>& Knots,
                                              const NCollection_Array1<int>&    Mults);
 
   //! Knots of the multiBSpCurve are assigned to <theknots>.
   Standard_EXPORT void SetKnots(const NCollection_Array1<double>& theKnots);
 
   //! Multiplicities of the multiBSpCurve are assigned
   //! to <theMults>.
   Standard_EXPORT void SetMultiplicities(const NCollection_Array1<int>& theMults);
 
   //! Returns an array of Reals containing
   //! the multiplicities of curves resulting from the approximation.
   Standard_EXPORT const NCollection_Array1<double>& Knots() const;
 
   //! Returns an array of Reals containing the
   //! multiplicities of curves resulting from the approximation.
   Standard_EXPORT const NCollection_Array1<int>& Multiplicities() const;
 
   //! returns the degree of the curve(s).
   Standard_EXPORT int Degree() const override;
 
   //! returns the value of the point with a parameter U
   //! on the BSpline curve number CuIndex.
   //! An exception is raised if CuIndex <0 or > NbCurves.
   //! An exception is raised if the curve dimension is 2d.
   Standard_EXPORT void Value(const int CuIndex, const double U, gp_Pnt& Pt) const override;
 
   //! returns the value of the point with a parameter U
   //! on the BSpline curve number CuIndex.
   //! An exception is raised if CuIndex <0 or > NbCurves.
   //! An exception is raised if the curve dimension is 3d.
   Standard_EXPORT void Value(const int CuIndex, const double U, gp_Pnt2d& Pt) const override;
 
   //! returns the value of the point with a parameter U
   //! on the BSpline curve number CuIndex.
   //! An exception is raised if CuIndex <0 or > NbCurves.
   //! An exception is raised if the curve dimension is 3d.
   Standard_EXPORT void D1(const int CuIndex, const double U, gp_Pnt& Pt, gp_Vec& V1) const override;
 
   //! returns the value of the point with a parameter U
   //! on the BSpline curve number CuIndex.
   //! An exception is raised if CuIndex <0 or > NbCurves.
   //! An exception is raised if the curve dimension is 2d.
   Standard_EXPORT void D1(const int    CuIndex,
                           const double U,
                           gp_Pnt2d&    Pt,
                           gp_Vec2d&    V1) const override;
 
   //! returns the value of the point with a parameter U
   //! on the BSpline curve number CuIndex.
   //! An exception is raised if CuIndex <0 or > NbCurves.
   //! An exception is raised if the curve dimension is 3d.
   Standard_EXPORT void D2(const int    CuIndex,
                           const double U,
                           gp_Pnt&      Pt,
                           gp_Vec&      V1,
                           gp_Vec&      V2) const override;
 
   //! returns the value of the point with a parameter U
   //! on the BSpline curve number CuIndex.
   //! An exception is raised if CuIndex <0 or > NbCurves.
   //! An exception is raised if the curve dimension is 2d.
   Standard_EXPORT void D2(const int    CuIndex,
                           const double U,
                           gp_Pnt2d&    Pt,
                           gp_Vec2d&    V1,
                           gp_Vec2d&    V2) const override;
 
   //! Prints on the stream o information on the current
   //! state of the object.
   //! Is used to redefine the operator <<.
   Standard_EXPORT void Dump(Standard_OStream& o) const override;
 
 private:
   occ::handle<NCollection_HArray1<double>> myknots;
   occ::handle<NCollection_HArray1<int>>    mymults;
   int                                      myDegree;
 };
 
 #endif // _AppParCurves_MultiBSpCurve_HeaderFile

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