-- File:	MakeEllipse.cdl
-- Created:	Mon Sep 28 11:49:44 1992
-- Author:	Remi GILET
--		<reg@sdsun2>
---Copyright:	 Matra Datavision 1992

class MakeEllipse from GCE2d inherits Root from GCE2d

    ---Purpose :This class implements the following algorithms used to 
    --          create Ellipse from gp.           
    --          * Create an Ellipse from two apex  and the center.
    --  Defines an ellipse in 2D space. 
    --  The parametrization range is [0,2*PI].
    --  The ellipse is a closed and periodic curve.
    --  The center of the ellipse is the "Location" point of its 
    --  axis placement "XAxis".
    --  The "XAxis" of the ellipse defines the origin of the
    --  parametrization, it is the major axis of the ellipse.
    --  The YAxis is the minor axis of the ellipse.

uses Pnt2d     from gp,
     Ellipse   from Geom2d,
     Elips2d   from gp,
     Ax22d     from gp,
     Ax2d      from gp

raises NotDone from StdFail

is

Create (E : Elips2d from gp)  returns MakeEllipse;
    --- Purpose :
    --  Creates an ellipse from a non persistent one from package gp

Create (MajorAxis   : Ax2d    from gp                       ; 
    	MajorRadius : Real    from Standard                 ;
        MinorRadius : Real    from Standard                 ;
    	Sense       : Boolean from Standard = Standard_True )
     returns MakeEllipse;
    --- Purpose :
    --  MajorAxis is the local coordinate system of the ellipse.
    --  It is the "XAxis". The minor axis  is the YAxis of the
    --  ellipse.
    --  Sense give the sense of parametrization of the Ellipse.
    --  It is not forbidden to create an ellipse with MajorRadius =
    --  MinorRadius.
    --  The status is "InvertRadius" if MajorRadius < MinorRadius or 
    --  "NegativeRadius" if MinorRadius < 0.

Create (Axis                     : Ax22d from gp     ; 
    	MajorRadius, MinorRadius : Real from Standard)
     returns MakeEllipse;
    --- Purpose :
    --  Axis is the local coordinate system of the ellipse.
    --  It is not forbidden to create an ellipse with MajorRadius =
    --  MinorRadius.
    --  The status is "InvertRadius" if MajorRadius < MinorRadius or 
    --  "NegativeRadius" if MinorRadius < 0.

        
Create(S1,S2  : Pnt2d from gp;
       Center : Pnt2d from gp) returns MakeEllipse;
    ---Purpose: Make an Ellipse centered on the point Center, where
    --   -   the major axis of the ellipse 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.
    -- The implicit orientation of the ellipse is:
    -- -   the sense defined by Axis or E,
    -- -   the sense defined by points Center, S1 and S2,
    -- -   the trigonometric sense if Sense is not given or is true, or
    -- -   the opposite sense if Sense is false.
    
Value(me) returns Ellipse from Geom2d
    raises NotDone
    is static;
    ---C++: return const&
    ---Purpose: Returns the constructed ellipse.
    -- Exceptions StdFail_NotDone if no ellipse is constructed.
    
Operator(me) returns Ellipse from Geom2d
    is static;
    ---C++: return const&
    ---C++: alias "Standard_EXPORT operator Handle_Geom2d_Ellipse() const;"

fields

    TheEllipse : Ellipse from Geom2d;
    --The solution from Geom2d.
    
end MakeEllipse;