Matplotlib - 在注释函数中设置箭头和文本之间的填充

问题描述

如何在 matplotlib 的 annotate 函数中设置箭头和文本之间的距离(填充)?有时文本最终会离箭头太近，我想将它们分开一点.

How do I set the distance (padding) between the arrow and the text in matplotlib's annotate function? Sometimes the text ends up being too close to the arrow and I would like to move them a little further apart.

基本示例:

import matplotlib.pyplot as plt

plt.annotate('Here it is!',xy=(-1,-1),xytext=(0,0),
             arrowprops=dict(arrowstyle='->',lw=1.5))

plt.xlim(-10,10)
plt.ylim(-10,10)

plt.show()

推荐答案

对于精美的箭头，您可以使用 bbox 属性:

For fancy arrows you can play with the bbox properties:

fig, ax = plt.subplots(1, 3, figsize=(7, 3))
pad_val = [-5, 0, 5]
for a,p in zip(ax, pad_val):
    a.annotate('Here it is!\npad={}'.format(p),xy=(-1,-1),xytext=(1,1),
                arrowprops=dict(arrowstyle='-|>', fc="k", ec="k", lw=1.5),
                bbox=dict(pad=p, facecolor="none", edgecolor="none"))
    a.set_xlim(-10,10)
    a.set_ylim(-10,10)

这里的缺点是您不能在注解后面添加颜色( facecolor ="none" 是必需的)，否则箭头将始终粘在框架的边框上，并且变丑.

Here the drawback is that you can't add a color behind the annotation (facecolor="none" is mandatory), or the arrow will always stick to the border of the frame and it might be ugly.

HTH

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