计时器

使用通用计时器对象的简单示例。这用于更新图形标题中的时间。

from datetime import datetime

import matplotlib.pyplot as plt
import numpy as np


def update_title(axes):
    axes.set_title(datetime.now())
    axes.figure.canvas.draw()

fig, ax = plt.subplots()

x = np.linspace(-3, 3)
ax.plot(x, x ** 2)

# Create a new timer object. Set the interval to 100 milliseconds
# (1000 is default) and tell the timer what function should be called.
timer = fig.canvas.new_timer(interval=100)
timer.add_callback(update_title, ax)
timer.start()

# Or could start the timer on first figure draw:
# def start_timer(event):
#     timer.start()
#     fig.canvas.mpl_disconnect(drawid)
# drawid = fig.canvas.mpl_connect('draw_event', start_timer)

plt.show()