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47 lines
1.4 KiB
Markdown
47 lines
1.4 KiB
Markdown
# 注释极坐标
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此示例显示如何在极坐标图上创建注释。
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有关注释功能的完整概述，另请参阅[注释教程](https://matplotlib.org/tutorials/text/annotations.html)。
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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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fig = plt.figure()
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ax = fig.add_subplot(111, polar=True)
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r = np.arange(0,1,0.001)
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theta = 2 * 2*np.pi * r
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line, = ax.plot(theta, r, color='#ee8d18', lw=3)
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ind = 800
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thisr, thistheta = r[ind], theta[ind]
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ax.plot([thistheta], [thisr], 'o')
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ax.annotate('a polar annotation',
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xy=(thistheta, thisr), # theta, radius
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xytext=(0.05, 0.05), # fraction, fraction
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textcoords='figure fraction',
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arrowprops=dict(facecolor='black', shrink=0.05),
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horizontalalignment='left',
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verticalalignment='bottom',
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)
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plt.show()
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```
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## 参考
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此示例中显示了以下函数，方法，类和模块的使用：
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```python
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import matplotlib
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matplotlib.projections.polar
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matplotlib.axes.Axes.annotate
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matplotlib.pyplot.annotate
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```
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## 下载这个示例
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- [下载python源码: annotation_polar.py](https://matplotlib.org/_downloads/annotation_polar.py)
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- [下载Jupyter notebook: annotation_polar.ipynb](https://matplotlib.org/_downloads/annotation_polar.ipynb) |