NAME
	AreaEllipse -- add a ellipse to areainfo list for areafill.


    SYNOPSIS
	error = AreaEllipse( rp, cx,   cy,   a,    b    )
	d0		     a1  d0:16 d1:16 d2:16 d3:16

	LONG AreaEllipse( struct RastPort *, SHORT, SHORT, SHORT, SHORT)

    FUNCTION
	Add an ellipse to the vector buffer. It will be draw when AreaEnd() is
	called.

    INPUTS
	rp - pointer to a RastPort structure
	cx - x coordinate of the centerpoint relative to the rastport.
	cy - y coordinate of the centerpoint relative to the rastport.
	a  - the horizontal radius of the ellipse (note: a must be > 0)
	b  - the vertical radius of the ellipse (note: b must be > 0)

    RESULT
	error - zero for success, or -1 if there is no space left in the
		vector list

    SEE ALSO
	AreaMove() AreaDraw() AreaCircle() InitArea() AreaEnd()
	graphics/rastport.h