调整文本背景透明度 [英] Adjusting Text background transparency

问题描述

我试图在 matplotlib 图形上放置一些带有背景的文本，文本和背景都是透明的.以下代码

I'm trying to put some text with a background on a matplotlib figure, with the text and background both transparent. The following code

import numpy as np
import matplotlib.pyplot as plt
plt.figure()
ax = plt.subplot(111)
plt.plot(np.linspace(1,0,1000))
t = plt.text(0.03,.95,'text',transform=ax.transAxes,backgroundcolor='0.75',alpha=.5)
plt.show()

使文本相对于文本背景为半透明，但背景相对于其在图中遮盖的线并不完全透明.

makes the text semi-transparent relative to the text's background, but the background isn't at all transparent relative to the line it obscures in the figure.

t.figure.set_alpha(.5)

和

t.figure.patch.set_alpha(.5)

也不要耍花招.

推荐答案

传递给 plt.text() 的 alpha 将改变文本字体的透明度.要更改背景，您必须使用 Text.set_bbox():

The alpha passed to plt.text() will change the transparency of the text font. To change the background you have to change the alpha using Text.set_bbox():

t = plt.text(0.5, 0.5, 'text', transform=ax.transAxes, fontsize=30)
t.set_bbox(dict(facecolor='red', alpha=0.5, edgecolor='red'))
#changed first dict arg from "color='red'" to "facecolor='red'" to work on python 3.6

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