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 // Created on: 1992-09-28
 // 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 _GC_MakeEllipse_HeaderFile
 #define _GC_MakeEllipse_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <GC_Root.hxx>
 #include <Geom_Ellipse.hxx>
 
 class gp_Elips;
 class gp_Ax2;
 class gp_Pnt;
 
 //! This class implements construction algorithms for an ellipse in
 //! 3D space. The result is a Geom_Ellipse ellipse.
 //! A MakeEllipse object provides a framework for:
 //! -   defining the construction of the ellipse,
 //! -   implementing the construction algorithm, and
 //! -   consulting the results. In particular, the Value
 //! function returns the constructed ellipse.
 class GC_MakeEllipse : public GC_Root
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Creates an ellipse from a non persistent ellipse E from package gp by its conversion.
   Standard_EXPORT GC_MakeEllipse(const gp_Elips& E);
 
   //! Constructs an ellipse with major and minor radii MajorRadius and
   //! MinorRadius, and located in the plane defined by
   //! the "X Axis" and "Y Axis" of the coordinate system A2, where:
   //! -   its center is the origin of A2, and
   //! -   its major axis is the "X Axis" of A2;
   //! Warnings :
   //! The MakeEllipse class does not prevent the
   //! construction of an ellipse where MajorRadius is equal to MinorRadius.
   //! If an error occurs (that is, when IsDone returns
   //! false), the Status function returns:
   //! -   gce_InvertRadius if MajorRadius is less than MinorRadius;
   //! -   gce_NegativeRadius if MinorRadius is less than 0.0;
   //! -   gce_NullAxis if the points S1 and Center are coincident; or
   //! -   gce_InvertAxis if:
   //! -   the major radius computed with Center and S1
   //! is less than the minor radius computed with Center, S1 and S2, or
   //! -   Center, S1 and S2 are collinear.
   Standard_EXPORT GC_MakeEllipse(const gp_Ax2&       A2,
                                  const Standard_Real MajorRadius,
                                  const Standard_Real MinorRadius);
 
   //! Constructs an ellipse centered on the point Center, where
   //! -   the plane of the ellipse is defined by Center, S1 and S2,
   //! -   its major axis is defined by Center and S1,
   //! -   its major radius is the distance between Center and S1, and
   //! -   its minor radius is the distance between S2 and the major axis.
   Standard_EXPORT GC_MakeEllipse(const gp_Pnt& S1, const gp_Pnt& S2, const gp_Pnt& Center);
 
   //! Returns the constructed ellipse.
   //! Exceptions StdFail_NotDone if no ellipse is constructed.
   Standard_EXPORT const Handle(Geom_Ellipse)& Value() const;
 
   operator const Handle(Geom_Ellipse) & () const { return Value(); }
 
 private:
   Handle(Geom_Ellipse) TheEllipse;
 };
 
 #endif // _GC_MakeEllipse_HeaderFile

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