'Draw a chord.'

def chord(self, xy, start, end, fill=None, outline=None):

    (ink, fill) = self._getink(outline, fill)
    if (fill is not None):
        self.draw.draw_chord(xy, start, end, fill, 1)
    if (ink is not None):
        self.draw.draw_chord(xy, start, end, ink, 0)
