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     The ellipse functions draw ellipses or circles. The borders are
     drawn in the current color.
 
     In the ellipse function, the center of the ellipse is the center of
     the bounding rectangle defined by the view-coordinate points (<x1>,
     <y1>) and (<x2>, <y2>).
 
     In the ellipse_w function, the center of the ellipse is the center
     of the bounding rectangle defined by the window-coordinate points
     (<wx1>, <wy1>) and (<wx2>, <wy2>).
 
     If the bounding-rectangle arguments define a point or a vertical or
     horizontal line, no figure is drawn.
 
     The <control> argument can be one of the following symbolic
     constants: $GBORDER or $GFILLINTERIOR.
 
     The <control> option given by $GFILLINTERIOR is equivalent to a
     subsequent call to the floodfill function using the center of the
     ellipse as the starting point and the current color (set by
     setcolor) as the boundary color.
 
     Constant           Meaning
 
     $GBORDER           Does not fill the ellipse.
 
     $GFILLINTERIOR     Fills the ellipse using the current color and
                        fill mask.
 
     Return Value
 
     The ellipse functions return a nonzero value if the ellipse is
     drawn successfully; otherwise, they return 0.
                                    -♦-