-- File:	Graphic2d_Ellips.cdl
-- Created:	Tue Jun 22 16:36:51 1993
-- Author:	Jean Louis FRENKEL, Gerard GRAS
--		<jlf@stylox>
-- Modified: TCL G002A, 28-11-00, new section "inquire methods"

---Copyright:	 Matra Datavision 1993

class Ellips from Graphic2d inherits Line from Graphic2d

	---Version:

	---Purpose: The primitive Ellips

	---Keywords: Primitive, Ellips
	---Warning:
	---References:

uses

	Drawer		from Graphic2d,
	GraphicObject	from Graphic2d,
	PlaneAngle	from Quantity,
	Length		from Quantity,
	FStream		from Aspect,
	IFStream	from Aspect


raises

	EllipsDefinitionError	from Graphic2d

is
	-------------------------
	-- Category: Constructors
	-------------------------

	Create (aGraphicObject: GraphicObject from Graphic2d;
		X, Y: Length from Quantity;
		MajorRadius, MinorRadius: Length from Quantity;
		anAngle: PlaneAngle from Quantity)
	returns mutable Ellips from Graphic2d
	---Level: Public
	---Purpose: Creates an ellipse.
	--	    The center is <X>, <Y>.
	--	    Angles are measured counterclockwise with 0 radian
	--	    at 3 o'clock.
	---Category: Constructors
	---Warning: Raises EllipsDefinitionError if the
	--          major radius or the minor radius is null.
	raises EllipsDefinitionError from Graphic2d;

	--------------------------
	-- Category: Draw and Pick
	--------------------------

	Draw (me : mutable; aDrawer: Drawer from Graphic2d)
	is static protected;
	---Level: Internal
	---Purpose: Draws the ellipse <me>.

    DrawElement( me : mutable; aDrawer: Drawer from Graphic2d;
                 anIndex: Integer from Standard)
        is redefined protected;
    	---Level: Internal
    	---Purpose: Draws element <anIndex> of the circle <me>.

    DrawVertex( me : mutable; aDrawer: Drawer from Graphic2d;
                anIndex: Integer from Standard)
        is redefined protected;
    	---Level: Internal
    	---Purpose: Draws vertex <anIndex> of the circle <me>.

	Pick (me : mutable; X, Y: ShortReal from Standard;
		aPrecision: ShortReal from Standard;
		aDrawer: Drawer from Graphic2d)
	returns Boolean from Standard
	is static protected;
	---Level: Internal
	---Purpose: Returns Standard_True if the ellipse <me> is picked,
	--	    Standard_False if not.

	--------------------------------------
	-- Category: Inquire methods
	--------------------------------------

	Center( me; X, Y: out Length from Quantity );  
	---Level: Public
	---Purpose: returns the coordinates of center of the ellipse

	MajorRadius( me ) returns Length from Quantity;
	---Level: Public
	---Purpose: returns the radius of the ellipse

	MinorRadius( me ) returns Length from Quantity;
	---Level: Public
	---Purpose: returns the radius of the ellipse

	Angle( me ) returns PlaneAngle from Quantity;
	---Level: Public
	---Purpose: returns the angle of the ellipse

	----------------------------------------------------------------------

	Save( me; aFStream: in out FStream from Aspect ) is virtual;
	Retrieve(myclass; anIFStream: in out IFStream from Aspect;
		aGraphicObject: GraphicObject from Graphic2d);

fields

	myX:		    ShortReal from Standard;
	myY:		    ShortReal from Standard;
	myMajorRadius:	    ShortReal from Standard;
	myMinorRadius:	    ShortReal from Standard;
	myAngle:	    ShortReal from Standard;

end Ellips from Graphic2d;