如何使用 Matplotlib 设置图形背景颜色的不透明度 [英] How to set opacity of background colour of graph with Matplotlib

问题描述

我一直在玩 Matplotlib，但我不知道如何更改图形的背景颜色，或者如何使背景完全透明.

I've been playing around with Matplotlib and I can't figure out how to change the background colour of the graph, or how to make the background completely transparent.

推荐答案

如果你只是想让图形和坐标轴的整个背景都透明，你可以简单地指定 transparent=True 当使用 fig.savefig 保存图形.

If you just want the entire background for both the figure and the axes to be transparent, you can simply specify transparent=True when saving the figure with fig.savefig.

例如:

import matplotlib.pyplot as plt
fig = plt.figure()
plt.plot(range(10))
fig.savefig('temp.png', transparent=True)

如果您想要更细粒度的控制，您可以简单地为图形和轴背景补丁设置 facecolor 和/或 alpha 值.(要使补丁完全透明，我们可以将 alpha 设置为 0，或者将 facecolor 设置为 'none'(作为字符串，而不是对象 None！))

If you want more fine-grained control, you can simply set the facecolor and/or alpha values for the figure and axes background patch. (To make a patch completely transparent, we can either set the alpha to 0, or set the facecolor to 'none' (as a string, not the object None!))

例如:

import matplotlib.pyplot as plt

fig = plt.figure()

fig.patch.set_facecolor('blue')
fig.patch.set_alpha(0.7)

ax = fig.add_subplot(111)

ax.plot(range(10))

ax.patch.set_facecolor('red')
ax.patch.set_alpha(0.5)

# If we don't specify the edgecolor and facecolor for the figure when
# saving with savefig, it will override the value we set earlier!
fig.savefig('temp.png', facecolor=fig.get_facecolor(), edgecolor='none')

plt.show()

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