plots.py 文件源码

def _redraw(self):
        """
        Redraw the plot and ask the widget to display the update.
        """
        # Perform the redraw with the render lock held, preventing the graphics
        # thread from trying to do a redraw at the same time.
        self._renderLock.acquire()
        try:
            # NB: In matplotlib 0.99, if you call the canvas' draw() method
            #     directly, it immediately redraws the canvas, but sets replot
            #     to true, leading to another redraw when the update is handled
            #     by the graphics thread.
            FigureCanvasAgg.draw(self._canvas)
            self._canvas.replot = False
            self._canvas.update()
        finally:
            self._renderLock.release()