matplotlib文本bbox的特定于侧面的填充 [英] Side-specific padding for matplotlib text bbox

问题描述

在matplotlib中添加文本时，是否可以在bbox的特定一侧指定填充?我正在将LaTex表添加为文本，由于某种原因，该表自然会没有对齐且没有填充规范.我想在bbox顶部添加填充来解决这个问题.

Is it possible to specify the padding on a specific side of the bbox when adding text in matplotlib? I'm adding a LaTex table as text and for some reason the table is misaligned naturally with no padding specifications. I'd like to account for this for adding padding on the top of the bbox.

不幸的是，似乎没有选择将填充添加到bbox的特定一侧.这可能吗?

Unfortunately, there doesn't seem to be an option for adding padding to a specific side of a bbox. Is this possible?

这里有一个例子来说明:

Here's an example to illustrate:

import matplotlib
matplotlib.rc('text',usetex=True)
import matplotlib.pyplot as plt
import numpy as np

text = '\\begin{tabular}{|c|c|}\\hline 1 & 2 \\\\ \\hline 3 & 4 \\\\ \\hline \\end{tabular}'

plt.imshow(np.zeros((10,10)), cmap=plt.cm.gray)
plt.text( 4.5,
          4.5,
          text,
          fontsize=24,
          bbox=dict(fc='w',boxstyle='square,pad=0.5'), va='center', ha='center')
plt.axis('off')
plt.show()

推荐答案

我找到了基于建议的答案的解决方法在这篇文章中.一个更简单的解决方案也将不胜感激.我还应该说，垂直偏移似乎仅在设置usetex: True时发生.

I've found a workaround which is based on the answer suggested in this post. An easier solution would also be appreciated. I should also say that the vertical misalignment seems to happen only when I set usetex: True.

以下是上述内容的修改版本:

Here's the modified version of the above:

import matplotlib
matplotlib.rc('text',usetex=True)
import matplotlib.pyplot as plt
from matplotlib.patches import Rectangle
import numpy as np

text = '\\begin{tabular}{|c|c|}\\hline1&2\\\\\\hline3&4\\\\\\hline\\end{tabular}'

fig, ax = plt.subplots(1)

img = ax.imshow(np.zeros((10,10)), cmap=plt.cm.gray)
txt = ax.text( 4.5,
          4.5,
          text,
          fontsize=24,
          ha='center',
          va='center',
          bbox=dict(alpha=0))

fig.canvas.draw()
bbox = txt.get_bbox_patch()
xmin = bbox.get_window_extent().xmin
xmax = bbox.get_window_extent().xmax
ymin = bbox.get_window_extent().ymin
ymax = bbox.get_window_extent().ymax

xmin, ymin = fig.transFigure.inverted().transform((xmin, ymin))
xmax, ymax = fig.transFigure.inverted().transform((xmax, ymax))

dx = xmax-xmin
dy = ymax-ymin

# The bounding box vals can be tweaked manually here.
rect = Rectangle((xmin-0.02,ymin-0.01), dx+0.04, dy+0.05, fc='w', transform=fig.transFigure)

ax.add_patch(rect)
fig.canvas.draw()
ax.axis('off')
plt.savefig('ok.png',bbox_inches='tight')

这将产生:

这篇关于matplotlib文本bbox的特定于侧面的填充的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！