-- File:	Graphic2d_EllipsMarker.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 EllipsMarker from Graphic2d inherits VectorialMarker from Graphic2d

	---Version:

	---Purpose: The primitive EllipsMarker 
	--	    Every marker takes a reference point as an argument in
	--	    its constructor. CircleMarker and EllipsMarker take
	--	    another point as the center and PolylineMarker takes the
	--	    first point of its list as its origin.
	--	    The coordinates of the centre or origin point are offsets
	--	    with respect to the reference point.

	---Keywords: Primitive, EllipsMarker
	---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;
		aXPosition, aYPosition: Length from Quantity;
		X, Y: Length from Quantity;
		MajorRadius, MinorRadius: Length from Quantity;
	        anAngle: PlaneAngle from Quantity)
	returns mutable EllipsMarker from Graphic2d
	---Level: Public
	---Purpose: Creates an ellipse marker with a reference point.
	--	    The reference point is <aXPosition>, <aYPosition>.
	--	    The center is <X>, <Y>.
	--	    Angles are measured counterclockwise with 0 radian
	--	    at 3 o'clock.
	--  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 ellips marker <me>.

    DrawVertex( me : mutable; aDrawer: Drawer from Graphic2d;
                anIndex: Integer from Standard)
        is redefined protected;
    	---Level: Internal
    	---Purpose: Draws vertex <anIndex> of the ellips marker <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
	
	MajorRadius( me ) returns Length from Quantity;
	---Level: Public
	---Purpose: returns the radius of the ellipse marker
	
    MinorRadius( me ) returns Length from Quantity;
	---Level: Public
	---Purpose: returns the radius of the ellipse marker
	
	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 EllipsMarker from Graphic2d;