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 // Created on: 1992-08-26
 // Created by: Remi GILET
 // 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 _gce_MakeParab_HeaderFile
 #define _gce_MakeParab_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <gp_Parab.hxx>
 #include <gce_Root.hxx>
 class gp_Ax2;
 class gp_Ax1;
 class gp_Pnt;
 
 //! This class implements the following algorithms used to
 //! create Parab from gp.
 //! Defines the parabola in the parameterization range  :
 //! ]-infinite, +infinite[
 //! The vertex of the parabola is the "Location" point of the
 //! local coordinate system (axis placement) of the parabola.
 //!
 //! The "XDirection" and the "YDirection" of this system define
 //! the plane of the parabola.
 //!
 //! The "XAxis" of the parabola ("Location", "XDirection") is
 //! the axis of symmetry of the parabola. The Xaxis is oriented
 //! from the vertex of the parabola to the Focus of the parabola.
 //!
 //! The "YAxis" of the parabola ("Location", "YDirection") is
 //! parallel to the directrix of the parabola.
 //!
 //! The equation of the parabola in the local coordinates system is
 //! Y**2 = (2*P) * X
 //! P is the distance between the focus and the directrix of the
 //! parabola (called Parameter).
 //! The focal length F = P/2 is the distance between the vertex
 //! and the focus of the parabola.
 //!
 //! * Creates a parabola with its local coordinate system "A2"
 //! and it's focal length "Focal".
 //! * Create a parabola with its directrix and its focus point.
 class gce_MakeParab : public gce_Root
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! --- Purpose ;
   //! Creates a parabola with its local coordinate system "A2"
   //! and it's focal length "Focal".
   //! The XDirection of A2 defines the axis of symmetry of the
   //! parabola. The YDirection of A2 is parallel to the directrix
   //! of the parabola. The Location point of A2 is the vertex of
   //! the parabola
   //! The status is "NullFocusLength" if Focal < 0.0
   Standard_EXPORT gce_MakeParab(const gp_Ax2& A2, const Standard_Real Focal);
 
   //! D is the directrix of the parabola and F the focus point.
   //! The symmetry axis (XAxis) of the parabola is normal to the
   //! directrix and pass through the focus point F, but its
   //! location point is the vertex of the parabola.
   //! The YAxis of the parabola is parallel to D and its location
   //! point is the vertex of the parabola. The normal to the plane
   //! of the parabola is the cross product between the XAxis and the
   //! YAxis.
   Standard_EXPORT gce_MakeParab(const gp_Ax1& D, const gp_Pnt& F);
 
   //! Returns the constructed parabola.
   //! Exceptions StdFail_NotDone if no parabola is constructed.
   Standard_EXPORT const gp_Parab& Value() const;
 
   Standard_EXPORT const gp_Parab& Operator() const;
   Standard_EXPORT                 operator gp_Parab() const;
 
 protected:
 private:
   gp_Parab TheParab;
 };
 
 #endif // _gce_MakeParab_HeaderFile

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