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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_Conic_HeaderFile
 #define _Geom2d_Conic_HeaderFile
 
 #include <gp_Ax22d.hxx>
 #include <Geom2d_Curve.hxx>
 
 //! The abstract class Conic describes the common
 //! behavior of conic curves in 2D space and, in
 //! particular, their general characteristics. The Geom2d
 //! package provides four specific classes of conics:
 //! Geom2d_Circle, Geom2d_Ellipse,
 //! Geom2d_Hyperbola and Geom2d_Parabola.
 //! A conic is positioned in the plane with a coordinate
 //! system (gp_Ax22d object), where the origin is the
 //! center of the conic (or the apex in case of a parabola).
 //! This coordinate system is the local coordinate
 //! system of the conic. It gives the conic an explicit
 //! orientation, determining the direction in which the
 //! parameter increases along the conic. The "X Axis" of
 //! the local coordinate system also defines the origin of
 //! the parameter of the conic.
 class Geom2d_Conic : public Geom2d_Curve
 {
 public:
   //! Modifies this conic, redefining its local coordinate system
   //! partially, by assigning theA as its axis
   void SetAxis(const gp_Ax22d& theA) { pos.SetAxis(theA); }
 
   //! Assigns the origin and unit vector of axis theA to the
   //! origin of the local coordinate system of this conic and X Direction.
   //! The other unit vector of the local coordinate system
   //! of this conic is recomputed normal to theA, without
   //! changing the orientation of the local coordinate
   //! system (right-handed or left-handed).
   void SetXAxis(const gp_Ax2d& theAX) { pos.SetXAxis(theAX); }
 
   //! Assigns the origin and unit vector of axis theA to the
   //! origin of the local coordinate system of this conic and Y Direction.
   //! The other unit vector of the local coordinate system
   //! of this conic is recomputed normal to theA, without
   //! changing the orientation of the local coordinate
   //! system (right-handed or left-handed).
   void SetYAxis(const gp_Ax2d& theAY) { pos.SetYAxis(theAY); }
 
   //! Modifies this conic, redefining its local coordinate
   //! system partially, by assigning theP as its origin.
   void SetLocation(const gp_Pnt2d& theP) { pos.SetLocation(theP); }
 
   //! Returns the "XAxis" of the conic.
   //! This axis defines the origin of parametrization of the conic.
   //! This axis and the "Yaxis" define the local coordinate system
   //! of the conic.
   //! -C++: return const&
   Standard_EXPORT gp_Ax2d XAxis() const;
 
   //! Returns the "YAxis" of the conic.
   //! The "YAxis" is perpendicular to the "Xaxis".
   Standard_EXPORT gp_Ax2d YAxis() const;
 
   //! returns the eccentricity value of the conic e.
   //! e = 0 for a circle
   //! 0 < e < 1 for an ellipse (e = 0 if MajorRadius = MinorRadius)
   //! e > 1 for a hyperbola
   //! e = 1 for a parabola
   Standard_EXPORT virtual double Eccentricity() const = 0;
 
   //! Returns the location point of the conic.
   //! For the circle, the ellipse and the hyperbola it is the center of
   //! the conic. For the parabola it is the vertex of the parabola.
   const gp_Pnt2d& Location() const { return pos.Location(); }
 
   //! Returns the local coordinates system of the conic.
   const gp_Ax22d& Position() const { return pos; }
 
   //! Reverses the direction of parameterization of <me>.
   //! The local coordinate system of the conic is modified.
   Standard_EXPORT void Reverse() override;
 
   //! Returns the parameter on the reversed curve for
   //! the point of parameter U on <me>.
   Standard_EXPORT double ReversedParameter(const double U) const override = 0;
 
   //! Returns GeomAbs_CN which is the global continuity of any conic.
   Standard_EXPORT GeomAbs_Shape Continuity() const override;
 
   //! Returns True, the order of continuity of a conic is infinite.
   Standard_EXPORT bool IsCN(const int N) const override;
 
   //! Dumps the content of me into the stream
   Standard_EXPORT void DumpJson(Standard_OStream& theOStream, int theDepth = -1) const override;
 
   DEFINE_STANDARD_RTTIEXT(Geom2d_Conic, Geom2d_Curve)
 
 protected:
   gp_Ax22d pos;
 };
 
 #endif // _Geom2d_Conic_HeaderFile

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