Ellipse(rect)
Draws an Ellipse.
Parameters
rect : (left, top, right, bottom)
Specifies the ellipse's bounding rectangleComments
The center of the ellipse is the center of the bounding rectangle 
specified by rect. The ellipse is drawn with the current pen, and its 
interior is filled with the current brush.
MFC References
CDC::Ellipse
Return Value
Always none.  If the function fails, an exception is raised.