// Created on: 1993-04-15
// Created by: Bruno DUMORTIER
// 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 _Adaptor2d_OffsetCurve_HeaderFile
#define _Adaptor2d_OffsetCurve_HeaderFile

#include <Adaptor2d_Curve2d.hxx>
#include <GeomAbs_CurveType.hxx>
#include <GeomAbs_Shape.hxx>
#include <Standard_Integer.hxx>
#include <TColStd_Array1OfReal.hxx>

class gp_Pnt2d;
class gp_Vec2d;
class gp_Lin2d;
class gp_Circ2d;
class gp_Elips2d;
class gp_Hypr2d;
class gp_Parab2d;
class Geom2d_BezierCurve;
class Geom2d_BSplineCurve;

//! Defines an Offset curve (algorithmic 2d curve).
class Adaptor2d_OffsetCurve  : public Adaptor2d_Curve2d
{
  DEFINE_STANDARD_RTTIEXT(Adaptor2d_OffsetCurve, Adaptor2d_Curve2d)
public:

  //! The Offset is set to 0.
  Standard_EXPORT Adaptor2d_OffsetCurve();
  
  //! The curve is loaded. The Offset is set to 0.
  Standard_EXPORT Adaptor2d_OffsetCurve(const Handle(Adaptor2d_Curve2d)& C);
  
  //! Creates  an  OffsetCurve curve.
  //! The Offset is set to Offset.
  Standard_EXPORT Adaptor2d_OffsetCurve(const Handle(Adaptor2d_Curve2d)& C, const Standard_Real Offset);
  
  //! Create an Offset curve.
  //! WFirst,WLast define the bounds of the Offset curve.
  Standard_EXPORT Adaptor2d_OffsetCurve(const Handle(Adaptor2d_Curve2d)& C, const Standard_Real Offset, const Standard_Real WFirst, const Standard_Real WLast);
  
  //! Shallow copy of adaptor
  Standard_EXPORT virtual Handle(Adaptor2d_Curve2d) ShallowCopy() const Standard_OVERRIDE;

  //! Changes  the curve.  The Offset is reset to 0.
  Standard_EXPORT void Load (const Handle(Adaptor2d_Curve2d)& S);
  
  //! Changes the Offset on the current Curve.
  Standard_EXPORT void Load (const Standard_Real Offset);
  
  //! Changes the Offset Curve on the current Curve.
  Standard_EXPORT void Load (const Standard_Real Offset, const Standard_Real WFirst, const Standard_Real WLast);

  const Handle(Adaptor2d_Curve2d)& Curve() const { return myCurve; }

  Standard_Real Offset() const { return myOffset; }

  virtual Standard_Real FirstParameter() const Standard_OVERRIDE { return myFirst; }

  virtual Standard_Real LastParameter() const Standard_OVERRIDE { return myLast; }

  Standard_EXPORT GeomAbs_Shape Continuity() const Standard_OVERRIDE;
  
  //! If necessary,  breaks the  curve in  intervals  of
  //! continuity  <S>.    And  returns   the number   of
  //! intervals.
  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;
  
  //! Returns    a  curve equivalent   of  <me>  between
  //! parameters <First>  and <Last>. <Tol>  is used  to
  //! test for 3d points confusion.
  //! If <First> >= <Last>
  Standard_EXPORT Handle(Adaptor2d_Curve2d) Trim (const Standard_Real First, const Standard_Real Last, const Standard_Real Tol) const Standard_OVERRIDE;
  
  Standard_EXPORT Standard_Boolean IsClosed() const Standard_OVERRIDE;
  
  Standard_EXPORT Standard_Boolean IsPeriodic() const Standard_OVERRIDE;
  
  Standard_EXPORT Standard_Real Period() const Standard_OVERRIDE;
  
  //! Computes the point of parameter U on the curve.
  Standard_EXPORT gp_Pnt2d Value (const Standard_Real U) const Standard_OVERRIDE;
  
  //! Computes the point of parameter U on the curve.
  Standard_EXPORT void D0 (const Standard_Real U, gp_Pnt2d& P) const Standard_OVERRIDE;
  
  //! Computes the point of parameter U on the curve with its
  //! first derivative.
  //! Raised if the continuity of the current interval
  //! is not C1.
  Standard_EXPORT void D1 (const Standard_Real U, gp_Pnt2d& P, gp_Vec2d& V) const Standard_OVERRIDE;
  

  //! Returns the point P of parameter U, the first and second
  //! derivatives V1 and V2.
  //! Raised if the continuity of the current interval
  //! is not C2.
  Standard_EXPORT void D2 (const Standard_Real U, gp_Pnt2d& P, gp_Vec2d& V1, gp_Vec2d& V2) const Standard_OVERRIDE;
  

  //! Returns the point P of parameter U, the first, the second
  //! and the third derivative.
  //! Raised if the continuity of the current interval
  //! is not C3.
  Standard_EXPORT void D3 (const Standard_Real U, gp_Pnt2d& P, gp_Vec2d& V1, gp_Vec2d& V2, gp_Vec2d& V3) const Standard_OVERRIDE;
  

  //! The returned vector gives the value of the derivative for the
  //! order of derivation N.
  //! Raised if the continuity of the current interval
  //! is not CN.
  //! Raised if N < 1.
  Standard_EXPORT gp_Vec2d DN (const Standard_Real U, const Standard_Integer N) const Standard_OVERRIDE;
  
  //! Returns the parametric  resolution corresponding
  //! to the real space resolution <R3d>.
  Standard_EXPORT Standard_Real Resolution (const Standard_Real R3d) const Standard_OVERRIDE;
  
  //! Returns  the  type of the   curve  in the  current
  //! interval :   Line,   Circle,   Ellipse, Hyperbola,
  //! Parabola, BezierCurve, BSplineCurve, OtherCurve.
  Standard_EXPORT GeomAbs_CurveType GetType() const Standard_OVERRIDE;
  
  Standard_EXPORT gp_Lin2d Line() const Standard_OVERRIDE;
  
  Standard_EXPORT gp_Circ2d Circle() const Standard_OVERRIDE;
  
  Standard_EXPORT gp_Elips2d Ellipse() const Standard_OVERRIDE;
  
  Standard_EXPORT gp_Hypr2d Hyperbola() const Standard_OVERRIDE;
  
  Standard_EXPORT gp_Parab2d Parabola() const Standard_OVERRIDE;
  
  Standard_EXPORT Standard_Integer Degree() const Standard_OVERRIDE;
  
  Standard_EXPORT Standard_Boolean IsRational() const Standard_OVERRIDE;
  
  Standard_EXPORT Standard_Integer NbPoles() const Standard_OVERRIDE;
  
  Standard_EXPORT Standard_Integer NbKnots() const Standard_OVERRIDE;
  
  Standard_EXPORT Handle(Geom2d_BezierCurve) Bezier() const Standard_OVERRIDE;
  
  Standard_EXPORT Handle(Geom2d_BSplineCurve) BSpline() const Standard_OVERRIDE;

  Standard_EXPORT  Standard_Integer NbSamples() const Standard_OVERRIDE;

private:

  Handle(Adaptor2d_Curve2d) myCurve;
  Standard_Real myOffset;
  Standard_Real myFirst;
  Standard_Real myLast;

};

DEFINE_STANDARD_HANDLE(Adaptor2d_OffsetCurve, Adaptor2d_Curve2d)

#endif // _Adaptor2d_OffsetCurve_HeaderFile