快速更新图中的单个点

您实际上忽略了发条所需的大部分功能。见例如

• 为什么用Matplotlib绘制这么慢？
• Matplotlib / PyPlot中的快速实时绘图

和往常一样

• 画画布

  fig.canvas.draw()

• 保存背景以备后用，

  fig.canvas.copy_from_bbox()

• 更新要点，

  point.set_data

• 恢复背景，

  fig.canvas.restore_region

• 指出要点，

  ax.draw_artist

• 咬住轴

  fig.canvas.blit

因此

import matplotlib.pyplot as pltimport numpy as npclass Test:    def __init__(self):        self.fig = plt.figure(1)        # Axis with large plot        self.ax_large = plt.subplot(121)        self.ax_large.imshow(np.random.random((5000,5000)))        # Follow the point        self.ax = plt.subplot(122)        self.ax.grid(True)        # set some limits to the axes        self.ax.set_xlim(-5,5)        self.ax.set_ylim(-5,5)        # Draw the canvas once        self.fig.canvas.draw()        # Store the background for later        self.background = self.fig.canvas.copy_from_bbox(self.ax.bbox)        # Now create some point        self.point, = self.ax.plot(0,0, 'go')        # Create callback to mouse movement        self.cid = self.fig.canvas.callbacks.connect('motion_notify_event',          self.callback)        plt.show()    def callback(self, event):        if event.inaxes == self.ax: # Update point's location  self.point.set_data(event.xdata, event.ydata) # Restore the background self.fig.canvas.restore_region(self.background) # draw the point on the screen self.ax.draw_artist(self.point) # blit the axes self.fig.canvas.blit(self.ax.bbox)tt = Test()