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 // Created on: 1994-08-18
 // Created by: Laurent PAINNOT
 // Copyright (c) 1994-1999 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 _Geom2dAPI_Interpolate_HeaderFile
 #define _Geom2dAPI_Interpolate_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <TColgp_HArray1OfPnt2d.hxx>
 #include <TColgp_HArray1OfVec2d.hxx>
 #include <TColStd_HArray1OfBoolean.hxx>
 #include <TColStd_HArray1OfReal.hxx>
 #include <TColgp_Array1OfVec2d.hxx>
 class Geom2d_BSplineCurve;
 class gp_Vec2d;
 
 
 //! This  class  is  used  to  interpolate a  BsplineCurve
 //! passing   through  an  array  of  points,  with  a  C2
 //! Continuity if tangency is not requested at the point.
 //! If tangency is requested at the point the continuity will
 //! be C1.  If Perodicity is requested the curve will be closed
 //! and the junction will be the first point given. The curve will than be only C1
 //! The curve is defined by a table of points through which it passes, and if required
 //! by a parallel table of reals which gives the value of the parameter of each point through
 //! which the resulting BSpline curve passes, and by vectors tangential to these points.
 //! An Interpolate object provides a framework for: defining the constraints of the BSpline curve,
 //! -   implementing the interpolation algorithm, and consulting the results.
 class Geom2dAPI_Interpolate 
 {
 public:
 
   DEFINE_STANDARD_ALLOC
 
   
   //! Tolerance is to check if the points are not too close to one an other
   //! It is also used to check if the tangent vector is not too small.
   //! There should be at least 2 points
   //! if PeriodicFlag is True then the curve will be periodic.
   Standard_EXPORT Geom2dAPI_Interpolate(const Handle(TColgp_HArray1OfPnt2d)& Points, 
                                         const Standard_Boolean PeriodicFlag, 
                                         const Standard_Real Tolerance);
   
   //! if PeriodicFlag is True then the curve will be periodic
   //! Warning:
   //! There should be as many parameters as there are points
   //! except if PeriodicFlag is True : then there should be one more
   //! parameter to close the curve
   Standard_EXPORT Geom2dAPI_Interpolate(const Handle(TColgp_HArray1OfPnt2d)& Points, 
                                         const Handle(TColStd_HArray1OfReal)& Parameters, 
                                         const Standard_Boolean PeriodicFlag, 
                                         const Standard_Real Tolerance);
   
   //! Assigns this constrained BSpline curve to be
   //! tangential to vectors InitialTangent and FinalTangent
   //! at its first and last points respectively (i.e.
   //! the first and last points of the table of
   //! points through which the curve passes, as
   //! defined at the time of initialization).
   //! <Scale> - boolean flag defining whether tangent vectors are to
   //! be scaled according to derivatives of lagrange interpolation.
   Standard_EXPORT void Load(const gp_Vec2d& InitialTangent, 
                             const gp_Vec2d& FinalTangent, 
                             const Standard_Boolean Scale = Standard_True);
   
   //! Assigns this constrained BSpline curve to be
   //! tangential to vectors defined in the table Tangents,
   //! which is parallel to the table of points
   //! through which the curve passes, as
   //! defined at the time of initialization. Vectors
   //! in the table Tangents are defined only if
   //! the flag given in the parallel table
   //! TangentFlags is true: only these vectors
   //! are set as tangency constraints.
   //! <Scale> - boolean flag defining whether tangent vectors are to
   //! be scaled according to derivatives of lagrange interpolation.
   Standard_EXPORT void Load(const TColgp_Array1OfVec2d& Tangents, 
                             const Handle(TColStd_HArray1OfBoolean)& TangentFlags, 
                             const Standard_Boolean Scale = Standard_True);
   
   //! Clears all tangency constraints on this
   //! constrained BSpline curve (as initialized by the function Load).
   Standard_EXPORT void ClearTangents();
   
   //! Computes the constrained BSpline curve. Use the function IsDone to verify that the
   //! computation is successful, and then the function Curve to obtain the result.
   Standard_EXPORT void Perform();
   
   //! Returns the computed BSpline curve. Raises  StdFail_NotDone if the interpolation fails.
   Standard_EXPORT const Handle(Geom2d_BSplineCurve)& Curve() const;
 Standard_EXPORT operator Handle(Geom2d_BSplineCurve)() const;
   
   //! Returns true if the constrained BSpline curve is successfully constructed.
   //! Note: in this case, the result is given by the function Curve.
   Standard_EXPORT Standard_Boolean IsDone() const;
 
 
 
 
 protected:
 
 
 
 
 
 private:
 
   
   //! Interpolates in a non periodic fashion
   Standard_EXPORT void PerformNonPeriodic();
   
   //! Interpolates in a C1 periodic fashion
   Standard_EXPORT void PerformPeriodic();
 
 
   Standard_Real myTolerance;
   Handle(TColgp_HArray1OfPnt2d) myPoints;
   Standard_Boolean myIsDone;
   Handle(Geom2d_BSplineCurve) myCurve;
   Handle(TColgp_HArray1OfVec2d) myTangents;
   Handle(TColStd_HArray1OfBoolean) myTangentFlags;
   Handle(TColStd_HArray1OfReal) myParameters;
   Standard_Boolean myPeriodic;
   Standard_Boolean myTangentRequest;
 
 
 };
 
 
 
 
 
 
 
 #endif // _Geom2dAPI_Interpolate_HeaderFile

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