Draw a circle given its center and radius.

def drawCircle(page, center, radius, color=None, fill=None,
               morph=None, dashes=None, width=1,
               roundCap=False, overlay=True):
    """Draw a circle given its center and radius.
    """
    img = page.newShape()
    Q = img.drawCircle(Point(center), radius)
    img.finish(color=color, fill=fill, dashes=dashes, width=width,
               roundCap=roundCap, morph=morph)
    img.commit(overlay)
    return Q