// Created on: 1992-03-26
// Created by: Herve LEGRAND
// Copyright (c) 1992-1999 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 _Geom2dLProp_CLProps2d_HeaderFile
#define _Geom2dLProp_CLProps2d_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

#include <Standard_Real.hxx>
#include <Standard_Integer.hxx>
#include <gp_Pnt2d.hxx>
#include <gp_Vec2d.hxx>
#include <gp_Dir2d.hxx>
#include <LProp_Status.hxx>
#include <Standard_Boolean.hxx>
class Geom2d_Curve;
class LProp_BadContinuity;
class Standard_DomainError;
class Standard_OutOfRange;
class LProp_NotDefined;
class gp_Vec2d;
class gp_Pnt2d;
class gp_Dir2d;
class Geom2dLProp_Curve2dTool;

class Geom2dLProp_CLProps2d
{
public:
  DEFINE_STANDARD_ALLOC

  //! Initializes the local properties of the curve <C>
  //! The current point and the derivatives are
  //! computed at the same time, which allows an
  //! optimization of the computation time.
  //! <N> indicates the maximum number of derivations to
  //! be done (0, 1, 2 or 3). For example, to compute
  //! only the tangent, N should be equal to 1.
  //! <Resolution> is the linear tolerance (it is used to test
  //! if a vector is null).
  Standard_EXPORT Geom2dLProp_CLProps2d(const Handle(Geom2d_Curve)& C,
                                        const Standard_Integer      N,
                                        const Standard_Real         Resolution);

  //! Same as previous constructor but here the parameter is
  //! set to the value <U>.
  //! All the computations done will be related to <C> and <U>.
  Standard_EXPORT Geom2dLProp_CLProps2d(const Handle(Geom2d_Curve)& C,
                                        const Standard_Real         U,
                                        const Standard_Integer      N,
                                        const Standard_Real         Resolution);

  //! Same as previous constructor but here the parameter is
  //! set to the value <U> and the curve is set
  //! with SetCurve.
  //! the curve can have a empty constructor
  //! All the computations done will be related to <C> and <U>
  //! when the functions "set" will be done.
  Standard_EXPORT Geom2dLProp_CLProps2d(const Standard_Integer N, const Standard_Real Resolution);

  //! Initializes the local properties of the curve
  //! for the parameter value <U>.
  Standard_EXPORT void SetParameter(const Standard_Real U);

  //! Initializes the local properties of the curve
  //! for the new curve.
  Standard_EXPORT void SetCurve(const Handle(Geom2d_Curve)& C);

  //! Returns the Point.
  Standard_EXPORT const gp_Pnt2d& Value() const;

  //! Returns the first derivative.
  //! The derivative is computed if it has not been yet.
  Standard_EXPORT const gp_Vec2d& D1();

  //! Returns the second derivative.
  //! The derivative is computed if it has not been yet.
  Standard_EXPORT const gp_Vec2d& D2();

  //! Returns the third derivative.
  //! The derivative is computed if it has not been yet.
  Standard_EXPORT const gp_Vec2d& D3();

  //! Returns True if the tangent is defined.
  //! For example, the tangent is not defined if the
  //! three first derivatives are all null.
  Standard_EXPORT Standard_Boolean IsTangentDefined();

  //! output  the tangent direction <D>
  Standard_EXPORT void Tangent(gp_Dir2d& D);

  //! Returns the curvature.
  Standard_EXPORT Standard_Real Curvature();

  //! Returns the normal direction <N>.
  Standard_EXPORT void Normal(gp_Dir2d& N);

  //! Returns the centre of curvature <P>.
  Standard_EXPORT void CentreOfCurvature(gp_Pnt2d& P);

protected:
private:
  Handle(Geom2d_Curve) myCurve;
  Standard_Real        myU;
  Standard_Integer     myDerOrder;
  Standard_Real        myCN;
  Standard_Real        myLinTol;
  gp_Pnt2d             myPnt;
  gp_Vec2d             myDerivArr[3];
  gp_Dir2d             myTangent;
  Standard_Real        myCurvature;
  LProp_Status         myTangentStatus;
  Standard_Integer     mySignificantFirstDerivativeOrder;
};

#endif // _Geom2dLProp_CLProps2d_HeaderFile
