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[Bug]: Subplot title does not obey padding #21394

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cipriantrofin opened this issue Oct 20, 2021 · 2 comments · Fixed by #21398
Closed

[Bug]: Subplot title does not obey padding #21394

cipriantrofin opened this issue Oct 20, 2021 · 2 comments · Fixed by #21398
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status: confirmed bug topic: ticks axis labels
Milestone
v3.6.0

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@cipriantrofin
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Bug summary

Last subplot title does not obey padding.

Code for reproduction

import pandas as pd
import matplotlib.pyplot as plt
df = pd.DataFrame({ "Austria" : [1,2,3,4,5],
                    "Belgium" : [6,7,8,9,10],
                    "France" : [11,12,13,14,15] },
                   index = pd.to_datetime(['2000-01-01', '2000-01-02', '2000-01-03', '2000-01-04', '2000-01-05']))

countryList = df.columns

fig, axs = plt.subplots(len(countryList), 1, figsize = (15, len(countryList) * 5), sharex = True)

for i, c in enumerate(countryList):
    axs[i].bar(df.index, df[c])
    axs[i].set_title(c, pad=-14)

Actual outcome

subplots

Expected outcome

"France" subplot title should be aligned as the previous ones.

Operating system

Windows 10 x64

Matplotlib Version

3.4.3

Matplotlib Backend

module://matplotlib_inline.backend_inline

Python version

Python 3.8.5

Jupyter version

jupyter notebook v6.4.5

Other libraries

No response

Installation

pip

Conda channel

No response
@jklymak
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jklymak commented Oct 20, 2021

As a workaround you can do

      axs[i].set_title(c, pad=-14, y=1.001)

The problem here is that the automatic title placement is interfering. However, I admit I'm a little flummoxed why it is only a problem for the last title.

I think there is a reasonable argument that if the user specifies pad or y they mean for the title to be placed manually.

@jklymak
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jklymak commented Oct 20, 2021

So this is a bit of a funny one. If you remove sharex=True, none of them are placed with the pad, which is expected behaviour, if a bit undesirable. Basically, the idea of the automatic placement of titles is that you don't want it to overlap axes. So it adjusts upwards, even if pad=-40 until it no longer overlaps.

However, if you set sharex=True the axes without xticks and xlabel have the axes position determined by ax.get_window_extent which at this point in the draw cycle is "None". That leads to the first two axes looking like they are obeying the pad.

@jklymak jklymak mentioned this issue Oct 20, 2021
Merged
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@jklymak jklymak linked a pull request Oct 21, 2021 that will close this issue
FIX: logic of title repositioning #21398
Merged
7 tasks
@QuLogic QuLogic added this to the v3.6.0 milestone Nov 23, 2021
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status: confirmed bug topic: ticks axis labels
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Milestone
v3.6.0
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FIX: logic of title repositioning jklymak/matplotlib
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@QuLogic @anntzer @jklymak @cipriantrofin