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 // Created on: 1993-03-24
 // Created by: JCV
 // 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 _Geom2d_Line_HeaderFile
 #define _Geom2d_Line_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_Type.hxx>
 
 #include <gp_Ax2d.hxx>
 #include <Geom2d_Curve.hxx>
 #include <GeomAbs_Shape.hxx>
 class gp_Lin2d;
 class gp_Dir2d;
 class gp_Trsf2d;
 class Geom2d_Geometry;
 
 //! Describes an infinite line in the plane (2D space).
 //! A line is defined and positioned in the plane with an
 //! axis (gp_Ax2d object) which gives it an origin and a unit vector.
 //! The Geom2d_Line line is parameterized as follows:
 //! P (U) = O + U*Dir
 //! where:
 //! - P is the point of parameter U,
 //! - O is the origin and Dir the unit vector of its positioning axis.
 //! The parameter range is ] -infinite, +infinite [.
 //! The orientation of the line is given by the unit vector
 //! of its positioning axis.
 //! See Also
 //! GCE2d_MakeLine which provides functions for more
 //! complex line constructions
 //! gp_Ax2d
 //! gp_Lin2d for an equivalent, non-parameterized data structure.
 class Geom2d_Line : public Geom2d_Curve
 {
 
 public:
   //! Creates a line located in 2D space with the axis placement A.
   //! The Location of A is the origin of the line.
   Standard_EXPORT Geom2d_Line(const gp_Ax2d& A);
 
   //! Creates a line by conversion of the gp_Lin2d line L.
   Standard_EXPORT Geom2d_Line(const gp_Lin2d& L);
 
   //! Constructs a line passing through point P and parallel to
   //! vector V (P and V are, respectively, the origin
   //! and the unit vector of the positioning axis of the line).
   Standard_EXPORT Geom2d_Line(const gp_Pnt2d& P, const gp_Dir2d& V);
 
   //! Set <me> so that <me> has the same geometric properties as L.
   Standard_EXPORT void SetLin2d(const gp_Lin2d& L);
 
   //! changes the direction of the line.
   Standard_EXPORT void SetDirection(const gp_Dir2d& V);
 
   //! changes the direction of the line.
   Standard_EXPORT const gp_Dir2d& Direction() const;
 
   //! Changes the "Location" point (origin) of the line.
   Standard_EXPORT void SetLocation(const gp_Pnt2d& P);
 
   //! Changes the "Location" point (origin) of the line.
   Standard_EXPORT const gp_Pnt2d& Location() const;
 
   //! Changes the "Location" and a the "Direction" of <me>.
   Standard_EXPORT void SetPosition(const gp_Ax2d& A);
 
   Standard_EXPORT const gp_Ax2d& Position() const;
 
   //! Returns non persistent line from gp with the same geometric
   //! properties as <me>
   Standard_EXPORT gp_Lin2d Lin2d() const;
 
   //! Changes the orientation of this line. As a result, the
   //! unit vector of the positioning axis of this line is reversed.
   Standard_EXPORT void Reverse() final;
 
   //! Computes the parameter on the reversed line for the
   //! point of parameter U on this line.
   //! For a line, the returned value is -U.
   Standard_EXPORT double ReversedParameter(const double U) const final;
 
   //! Returns RealFirst from Standard.
   Standard_EXPORT double FirstParameter() const final;
 
   //! Returns RealLast from Standard
   Standard_EXPORT double LastParameter() const final;
 
   //! Returns False
   Standard_EXPORT bool IsClosed() const final;
 
   //! Returns False
   Standard_EXPORT bool IsPeriodic() const final;
 
   //! Returns GeomAbs_CN, which is the global continuity of any line.
   Standard_EXPORT GeomAbs_Shape Continuity() const final;
 
   //! Computes the distance between <me> and the point P.
   Standard_EXPORT double Distance(const gp_Pnt2d& P) const;
 
   //! Returns True.
   Standard_EXPORT bool IsCN(const int N) const final;
 
   //! Returns in P the point of parameter U.
   //! P (U) = O + U * Dir where O is the "Location" point of the
   //! line and Dir the direction of the line.
   Standard_EXPORT gp_Pnt2d EvalD0(const double U) const final;
 
   //! Returns the point P of parameter u and the first derivative V1.
   Standard_EXPORT Geom2d_Curve::ResD1 EvalD1(const double U) const final;
 
   //! Returns the point P of parameter U, the first and second
   //! derivatives V1 and V2. V2 is a vector with null magnitude
   //! for a line.
   Standard_EXPORT Geom2d_Curve::ResD2 EvalD2(const double U) const final;
 
   //! V2 and V3 are vectors with null magnitude for a line.
   Standard_EXPORT Geom2d_Curve::ResD3 EvalD3(const double U) const final;
 
   //! For the point of parameter U of this line, computes
   //! the vector corresponding to the Nth derivative.
   //! Note: if N is greater than or equal to 2, the result is a
   //! vector with null magnitude.
   //! Exceptions Standard_RangeError if N is less than 1.
   Standard_EXPORT gp_Vec2d EvalDN(const double U, const int N) const final;
 
   //! Applies the transformation T to this line.
   Standard_EXPORT void Transform(const gp_Trsf2d& T) final;
 
   //! Computes the parameter on the line transformed by
   //! T for the point of parameter U on this line.
   //! For a line, the returned value is equal to U multiplied
   //! by the scale factor of transformation T.
   Standard_EXPORT double TransformedParameter(const double U, const gp_Trsf2d& T) const final;
 
   //! Returns the coefficient required to compute the
   //! parametric transformation of this line when
   //! transformation T is applied. This coefficient is the
   //! ratio between the parameter of a point on this line
   //! and the parameter of the transformed point on the
   //! new line transformed by T.
   //! For a line, the returned value is the scale factor of the transformation T.
   Standard_EXPORT double ParametricTransformation(const gp_Trsf2d& T) const final;
 
   //! Creates a new object, which is a copy of this line.
   Standard_EXPORT occ::handle<Geom2d_Geometry> Copy() const final;
 
   //! Dumps the content of me into the stream
   Standard_EXPORT void DumpJson(Standard_OStream& theOStream, int theDepth = -1) const final;
 
   DEFINE_STANDARD_RTTIEXT(Geom2d_Line, Geom2d_Curve)
 
 private:
   gp_Ax2d pos;
 };
 
 #endif // _Geom2d_Line_HeaderFile

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