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"""
======
Timers
======
Simple example of using general timer objects. This is used to update
the time placed in the title of the figure.
.. note::
This example exercises the interactive capabilities of Matplotlib, and this
will not appear in the static documentation. Please run this code on your
machine to see the interactivity.
You can copy and paste individual parts, or download the entire example
using the link at the bottom of the page.
"""
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()
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