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54 lines
1.3 KiB
Markdown
54 lines
1.3 KiB
Markdown
# 按钮
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构建一个简单的按钮GUI来修改正弦波。
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``下一个``和``上一个``按钮小部件有助于以新频率显示波形。
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```python
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import numpy as np
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import matplotlib.pyplot as plt
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from matplotlib.widgets import Button
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freqs = np.arange(2, 20, 3)
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fig, ax = plt.subplots()
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plt.subplots_adjust(bottom=0.2)
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t = np.arange(0.0, 1.0, 0.001)
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s = np.sin(2*np.pi*freqs[0]*t)
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l, = plt.plot(t, s, lw=2)
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class Index(object):
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ind = 0
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def next(self, event):
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self.ind += 1
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i = self.ind % len(freqs)
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ydata = np.sin(2*np.pi*freqs[i]*t)
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l.set_ydata(ydata)
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plt.draw()
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def prev(self, event):
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self.ind -= 1
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i = self.ind % len(freqs)
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ydata = np.sin(2*np.pi*freqs[i]*t)
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l.set_ydata(ydata)
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plt.draw()
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callback = Index()
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axprev = plt.axes([0.7, 0.05, 0.1, 0.075])
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axnext = plt.axes([0.81, 0.05, 0.1, 0.075])
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bnext = Button(axnext, 'Next')
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bnext.on_clicked(callback.next)
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bprev = Button(axprev, 'Previous')
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bprev.on_clicked(callback.prev)
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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: buttons.py](https://matplotlib.org/_downloads/buttons.py)
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- [下载Jupyter notebook: buttons.ipynb](https://matplotlib.org/_downloads/buttons.ipynb) |