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notes_estom/Python/matplotlab/gallery/recipes/transparent_legends.md
2020-09-26 22:03:11 +08:00

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# 透明、花式的图形
有时您在绘制数据之前就知道数据的样子,并且可能知道例如右上角没有太多数据。然后,您可以安全地创建不覆盖数据的图例:
```python
ax.legend(loc='upper right')
```
其他时候你不知道你的数据在哪里默认的loc ='best'会尝试放置图例:
```python
ax.legend()
```
但是,您的图例可能会与您的数据重叠,在这些情况下,使图例框架透明是很好的。
![透明、花式的图形示例](https://matplotlib.org/_images/sphx_glr_transparent_legends_001.png)
```python
import matplotlib.pyplot as plt
import numpy as np
np.random.seed(1234)
fig, ax = plt.subplots(1)
ax.plot(np.random.randn(300), 'o-', label='normal distribution')
ax.plot(np.random.rand(300), 's-', label='uniform distribution')
ax.set_ylim(-3, 3)
ax.legend(fancybox=True, framealpha=0.5)
ax.set_title('fancy, transparent legends')
plt.show()
```
## 下载这个示例
- [下载python源码: transparent_legends.py](https://matplotlib.org/_downloads/transparent_legends.py)
- [下载Jupyter notebook: transparent_legends.ipynb](https://matplotlib.org/_downloads/transparent_legends.ipynb)