// Created on: 1993-03-10
// Created by: Philippe DAUTRY
// 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 _Geom_Line_HeaderFile
#define _Geom_Line_HeaderFile

#include "Standard.hxx"
#include "Standard_Type.hxx"

#include "gp_Ax1.hxx"
#include "Geom_Curve.hxx"
#include "GeomAbs_Shape.hxx"
class gp_Lin;
class gp_Dir;
class gp_Trsf;
class Geom_Geometry;

//! Describes an infinite line.
//! A line is defined and positioned in space with an axis
//! (gp_Ax1 object) which gives it an origin and a unit vector.
//! The Geom_Line line is parameterized:
//! 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.
class Geom_Line : public Geom_Curve
{

public:
  //! Creates a line located in 3D space with the axis placement A1.
  //! The Location of A1 is the origin of the line.
  Standard_EXPORT Geom_Line(const gp_Ax1& A1);

  //! Creates a line from a non transient line from package gp.
  Standard_EXPORT Geom_Line(const gp_Lin& 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 Geom_Line(const gp_Pnt& P, const gp_Dir& V);

  //! Set <me> so that <me> has the same geometric properties as L.
  Standard_EXPORT void SetLin(const gp_Lin& L);

  //! changes the direction of the line.
  Standard_EXPORT void SetDirection(const gp_Dir& V);

  //! changes the "Location" point (origin) of the line.
  Standard_EXPORT void SetLocation(const gp_Pnt& P);

  //! changes the "Location" and a the "Direction" of <me>.
  Standard_EXPORT void SetPosition(const gp_Ax1& A1);

  //! Returns non transient line from gp with the same geometric
  //! properties as <me>
  Standard_EXPORT gp_Lin Lin() const;

  //! Returns the positioning axis of this line; this is also its local coordinate system.
  Standard_EXPORT const gp_Ax1& Position() 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 the value of the first parameter of this
  //! line. This is double::RealFirst().
  Standard_EXPORT double FirstParameter() const final;

  //! Returns the value of the last parameter of this
  //! line. This is double::RealLast().
  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;

  //! returns True.
  //! Raised if N < 0.
  Standard_EXPORT bool IsCN(const int N) const final;

  //! Returns 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_Pnt EvalD0(const double U) const final;

  //! Returns the point of parameter U and the first derivative.
  Standard_EXPORT Geom_Curve::ResD1 EvalD1(const double U) const final;

  //! Returns the point of parameter U, the first and second
  //! derivatives. The second derivative is a vector with null magnitude
  //! for a line.
  Standard_EXPORT Geom_Curve::ResD2 EvalD2(const double U) const final;

  //! Returns the point of parameter U, the first, second and third
  //! derivatives. The second and third derivatives are vectors with null magnitude for a line.
  Standard_EXPORT Geom_Curve::ResD3 EvalD3(const double U) const final;

  //! Returns the vector corresponding to the derivative for the
  //! order of derivation N.
  //! Raised if N < 1.
  Standard_EXPORT gp_Vec EvalDN(const double U, const int N) const final;

  //! Applies the transformation T to this line.
  Standard_EXPORT void Transform(const gp_Trsf& T) final;

  //! Returns the parameter on the transformed curve for
  //! the transform of the point of parameter U on <me>.
  //!
  //! me->Transformed(T)->Value(me->TransformedParameter(U,T))
  //!
  //! is the same point as
  //!
  //! me->Value(U).Transformed(T)
  //!
  //! This methods returns <U> * T.ScaleFactor()
  Standard_EXPORT double TransformedParameter(const double U, const gp_Trsf& T) const final;

  //! Returns a coefficient to compute the parameter on
  //! the transformed curve for the transform of the
  //! point on <me>.
  //!
  //! Transformed(T)->Value(U * ParametricTransformation(T))
  //!
  //! is the same point as
  //!
  //! Value(U).Transformed(T)
  //!
  //! This methods returns T.ScaleFactor()
  Standard_EXPORT double ParametricTransformation(const gp_Trsf& T) const final;

  //! Creates a new object which is a copy of this line.
  Standard_EXPORT occ::handle<Geom_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(Geom_Line, Geom_Curve)

private:
  gp_Ax1 pos;
};

#endif // _Geom_Line_HeaderFile