// Created on: 1995-11-15
// Created by: Laurent BOURESCHE
// Copyright (c) 1995-1999 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 _Law_BSpFunc_HeaderFile
#define _Law_BSpFunc_HeaderFile

#include <Standard.hxx>
#include <Standard_Type.hxx>

#include <Law_Function.hxx>
#include <GeomAbs_Shape.hxx>
#include <Standard_Integer.hxx>
#include <TColStd_Array1OfReal.hxx>
class Law_BSpline;


class Law_BSpFunc;
DEFINE_STANDARD_HANDLE(Law_BSpFunc, Law_Function)

//! Law Function based on a BSpline curve 1d.  Package
//! methods and classes are implemented in package Law
//! to    construct  the  basis    curve with  several
//! constraints.
class Law_BSpFunc : public Law_Function
{

public:

  Standard_EXPORT Law_BSpFunc();
  
  Standard_EXPORT Law_BSpFunc(const Handle(Law_BSpline)& C, const Standard_Real First, const Standard_Real Last);
  
  Standard_EXPORT GeomAbs_Shape Continuity() const Standard_OVERRIDE;
  
  //! Returns  the number  of  intervals for  continuity
  //! <S>. May be one if Continuity(me) >= <S>
  Standard_EXPORT Standard_Integer NbIntervals (const GeomAbs_Shape S) const Standard_OVERRIDE;

  //! Stores in <T> the parameters bounding the intervals of continuity <S>.
  //! The array must provide enough room to accommodate for the parameters, i.e. T.Length() > NbIntervals()
  Standard_EXPORT void Intervals (TColStd_Array1OfReal& T, const GeomAbs_Shape S) const Standard_OVERRIDE;

  Standard_EXPORT Standard_Real Value (const Standard_Real X) Standard_OVERRIDE;
  
  Standard_EXPORT void D1 (const Standard_Real X, Standard_Real& F, Standard_Real& D) Standard_OVERRIDE;
  
  Standard_EXPORT void D2 (const Standard_Real X, Standard_Real& F, Standard_Real& D, Standard_Real& D2) Standard_OVERRIDE;
  
  //! Returns a  law equivalent of  <me>  between
  //! parameters <First>  and <Last>. <Tol>  is used  to
  //! test for 3d points confusion.
  //! It is usfule to determines the derivatives
  //! in these values <First> and <Last> if
  //! the Law is not Cn.
  Standard_EXPORT Handle(Law_Function) Trim (const Standard_Real PFirst, const Standard_Real PLast, const Standard_Real Tol) const Standard_OVERRIDE;
  
  Standard_EXPORT void Bounds (Standard_Real& PFirst, Standard_Real& PLast) Standard_OVERRIDE;
  
  Standard_EXPORT Handle(Law_BSpline) Curve() const;
  
  Standard_EXPORT void SetCurve (const Handle(Law_BSpline)& C);

  DEFINE_STANDARD_RTTIEXT(Law_BSpFunc,Law_Function)

private:

  Handle(Law_BSpline) curv;
  Standard_Real first;
  Standard_Real last;

};

#endif // _Law_BSpFunc_HeaderFile
