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  Arguments
 
    control       One of the constants _GBorder or _GFillInterior
 
    x1, y1        Upper-left corner of bounding rectangle in viewport
                  coordinates
 
    x2, y2        Lower-right corner of bounding rectange in viewport
                  coordinates
 
    wx1, wy1      Upper-left corner of bounding rectangle in window
                  coordinates
 
    wx2, wy2      Lower-right corner of bounding rectange in window
                  coordinates
 
    wxy1, wxy2    Window coordinates of upper-left and lower-right
                  corners of bounding rectangle
 
  Description
 
    The _Ellipse routines draw an ellipse defined by the bounding
    rectangle. The border is drawn in the current color. In these
    functions, the center of the ellipse is the center of the
    bounding rectangle defined by the view coordinates (x1,y1)
    and (x2,y2).
 
    In _Ellipse_w and _Ellipse_wxy, the center of the ellipse
    is the center of the bounding rectangle defined by window
    coordinates (wx1,wy1) and (wx2,wy2), or (wxy1,wxy2),
    respectively.
 
    If the bounding-rectangle arguments define a point or a
    vertical or horizontal line, no figure is drawn. The control
    argument can be either the _GFillInterior or _GBorder constants.
    _GFillInterior fills the ellipse using the current fill mask.
    _GBorder draws the ellipse outline only.
 
    The control option _GFillInterior is equivalent to calling
    the _FloodFill procedure after the ellipse has been drawn. The
    center of the ellipse is the starting point for the fill operation,
    and the current color (set by _SetColor) is the boundary color.
 
  _GrStatus Returns
 
    _GrClipped, _GrInsufficientMemory, _GrInvalidParameter, _GrNoOutput,
    _GrNotInProperMode