pgf backend. Y-labels in subplot are not alligned after baseline but bottom of letter #1321

jenshnielsen · 2012-09-30T17:56:14Z

In the following example the baseline of the y labels are not aligned, rather it seems like the bottom of the g in one is aligned to the baseline of the other label. (The xlabels seems right) Using the pdf backend it appears correct. The issue does not seem to depend on the xelatex vs pdflatex and different fonts.

@pwuertz is this related to #1115 ?

import matplotlib
matplotlib.use('pgf')
import matplotlib.pyplot as plt
import numpy as np

params = {
          'text.usetex': True,
          'pgf.texsystem': 'xelatex',
          }
plt.rcParams.update(params)

fig,ax = plt.subplots(2,2)

ax[0,0].set_ylabel('test',fontsize=30) #large font size to make it easier to see
ax[1,0].set_ylabel('testg',fontsize=30)
ax[1,0].set_xlabel('test',fontsize=30)
ax[1,1].set_xlabel('testg',fontsize=30)
fig.savefig('test.pdf')

pwuertz · 2012-09-30T18:37:28Z

It's not "yet" related to #1115. What I would like to do is to pass the position and alignment information to the backend and handle text layout there.

At the moment, the positioning is fully determined by matplotlib and I do not see any difference using the PDF backend in your example. Using matplotlib's standard pdf output, I also see non-baseline aligned y-labels.

This is not really a surprise, since matplotlib aligns text elements by the bounding box of the global coordinate system. The Y-Label is therefore aligned with its right edge, not with a baseline. Baseline alignment is not possible for rotated texts using this scheme. So the question is... why do you see baseline aligned y-labels on your system ^^ ?

pwuertz · 2012-09-30T18:55:03Z

Oh, and the x-labels are not aligned to their base either. Their top line is aligned, which is the same for "test" and "testg". Also, in the usual case you don't really want baseline alignment. If your text (a formula maybe) exceeds the base or the top, you don't want it to overlap the ticks or the graph.

I guess the only way to handle co-baseline-aligned labels like the ones in the example is to do implement it in gridspec. One has to iterate over all subplots, check the sizes of the text elements and determine a common baseline.

pwuertz · 2012-09-30T18:59:13Z

Might be important to remember such a use-case for the re-design of matplotlibs layout technique #1109

jenshnielsen · 2012-09-30T19:10:31Z

I was sure that it worked with the pdf backend but cant seem to reproduce it now. Sorry for the noise.

jenshnielsen closed this as completed Sep 30, 2012

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pgf backend. Y-labels in subplot are not alligned after baseline but bottom of letter #1321

pgf backend. Y-labels in subplot are not alligned after baseline but bottom of letter #1321

jenshnielsen commented Sep 30, 2012

pwuertz commented Sep 30, 2012

Uh oh!

pwuertz commented Sep 30, 2012

Uh oh!

pwuertz commented Sep 30, 2012

Uh oh!

jenshnielsen commented Sep 30, 2012

Uh oh!

Uh oh!

pgf backend. Y-labels in subplot are not alligned after baseline but bottom of letter #1321

pgf backend. Y-labels in subplot are not alligned after baseline but bottom of letter #1321

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jenshnielsen commented Sep 30, 2012

pwuertz commented Sep 30, 2012

Uh oh!

pwuertz commented Sep 30, 2012

Uh oh!

pwuertz commented Sep 30, 2012

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jenshnielsen commented Sep 30, 2012

Uh oh!