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40 lines
1.0 KiB
Markdown
40 lines
1.0 KiB
Markdown
# 计时器
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使用通用计时器对象的简单示例。这用于更新图中标题的时间。
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```python
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import matplotlib.pyplot as plt
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import numpy as np
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from datetime import datetime
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def update_title(axes):
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axes.set_title(datetime.now())
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axes.figure.canvas.draw()
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fig, ax = plt.subplots()
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x = np.linspace(-3, 3)
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ax.plot(x, x ** 2)
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# Create a new timer object. Set the interval to 100 milliseconds
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# (1000 is default) and tell the timer what function should be called.
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timer = fig.canvas.new_timer(interval=100)
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timer.add_callback(update_title, ax)
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timer.start()
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# Or could start the timer on first figure draw
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#def start_timer(evt):
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# timer.start()
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# fig.canvas.mpl_disconnect(drawid)
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#drawid = fig.canvas.mpl_connect('draw_event', start_timer)
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plt.show()
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```
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## 下载这个示例
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- [下载python源码: timers.py](https://matplotlib.org/_downloads/timers.py)
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- [下载Jupyter notebook: timers.ipynb](https://matplotlib.org/_downloads/timers.ipynb) |