'Draw the string representation to the DrawingArea'

def draw(self):

    if (self.window is None):
        return
    style = self.get_style()
    gc = style.fg_gc[gtk.STATE_NORMAL]
    self.clear()
    if (self.str_repr is not None):
        for (index, value) in self.str_repr.iteritems():
            for i in xrange(value):
                self.window.draw_point(gc, index, (self.height - i))
