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[Bug]: multialignment='right' in ax.text() with path_effects breaks when using LaTeX package \usepackage[T1]{fontenc} #28675

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yjzhu-solar opened this issue Aug 7, 2024 · 1 comment · Fixed by #30100
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[Bug]: multialignment='right' in ax.text() with path_effects breaks when using LaTeX package \usepackage[T1]{fontenc} #28675

yjzhu-solar opened this issue Aug 7, 2024 · 1 comment · Fixed by #30100
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status: confirmed bug topic: text/usetex
Milestone
v3.11.0

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@yjzhu-solar
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yjzhu-solar commented Aug 7, 2024 •
edited
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Bug summary

When I plot a multiline text using ax.text() with path_effects under TeX environment with package \usepackage[T1]{fontenc} the multiline coalignment to right breaks.

Code for reproduction

import matplotlib
print(matplotlib.__version__)
import matplotlib.pyplot as plt
from matplotlib import rc_context, patheffects as path_effects
print(matplotlib.get_backend())

with rc_context({'text.usetex': True, 'font.family': 'serif', 'font.serif':'cm',
                 'text.latex.preamble': r'\usepackage[T1]{fontenc}'
                 }):
    fig, ax = plt.subplots(layout='constrained')
    text1 = ax.text(0, 0.95, r'\textbf{aaaaaaaaaaaaaaa}'
            "\n" + r'\textbf{{\quad\textsc{aaaaaa}}}',
            transform=ax.transAxes, fontsize=12, va='top', ha='left',linespacing=1.2,ma='left',
            color='green', )
    
    text2 = ax.text(0, 0.8, r'\textbf{aa}'
            "\n" + r'\textbf{{aaaaaaaaaaaaaaa}}',
            transform=ax.transAxes, fontsize=12, va='top', ha='left',linespacing=1.2,ma='right',
            color='red', path_effects=[path_effects.Stroke(linewidth=1.2, foreground='black'),
                                path_effects.Normal()])
    
    text3 = ax.text(1, 0.95, r'\textbf{aa}'
            "\n" + r'\textbf{{aaaaaaaaaaaaaaa}}',
            transform=ax.transAxes, fontsize=12, va='top', ha='right',linespacing=1.2,ma='right',
            color='red',)
    
    text4 = ax.text(1, 0.8, r'\textbf{aa}'
            "\n" + r'\textbf{{aaaaaaaaaaaaaaa}}',
            transform=ax.transAxes, fontsize=12, va='top', ha='right',linespacing=1.2,ma='right',
            color='red', path_effects=[path_effects.Stroke(linewidth=1.2, foreground='black'),
                                path_effects.Normal()])
    
    ax.set_title(r'With \textbackslash usepackage[T1]\{fontenc\}')

    plt.show()

with rc_context({'text.usetex': True, 'font.family': 'serif', 'font.serif':'cm',
                 }):
    fig, ax = plt.subplots(layout='constrained')
    text1 = ax.text(0, 0.95, r'\textbf{aaaaaaaaaaaaaaa}'
            "\n" + r'\textbf{{\quad\textsc{aaaaaa}}}',
            transform=ax.transAxes, fontsize=12, va='top', ha='left',linespacing=1.2,ma='left',
            color='green', )
    
    text2 = ax.text(0, 0.8, r'\textbf{aa}'
            "\n" + r'\textbf{{aaaaaaaaaaaaaaa}}',
            transform=ax.transAxes, fontsize=12, va='top', ha='left',linespacing=1.2,ma='right',
            color='red', path_effects=[path_effects.Stroke(linewidth=1.2, foreground='black'),
                                path_effects.Normal()])
    
    text3 = ax.text(1, 0.95, r'\textbf{aa}'
            "\n" + r'\textbf{{aaaaaaaaaaaaaaa}}',
            transform=ax.transAxes, fontsize=12, va='top', ha='right',linespacing=1.2,ma='right',
            color='red',)
    
    text4 = ax.text(1, 0.8, r'\textbf{aa}'
            "\n" + r'\textbf{{aaaaaaaaaaaaaaa}}',
            transform=ax.transAxes, fontsize=12, va='top', ha='right',linespacing=1.2,ma='right',
            color='red', path_effects=[path_effects.Stroke(linewidth=1.2, foreground='black'),
                                path_effects.Normal()])
    
    ax.set_title(r'Without \textbackslash usepackage[T1]\{fontenc\}')

    plt.show()

Actual outcome

The ma='right' breaks for the bottom two texts with path_effects.
image

Expected outcome

I would expect something similar without \usepackage[T1]{fontenc} below, but somehow I really want to include it because it provides some additional support, for example, nesting \textsc{} in \textbf{}.
image

Additional information

No response

Operating system

WSL 2.2.4.0/Ubuntu 22.04.3 LTS

Matplotlib Version

3.9.1

Matplotlib Backend

qtagg

Python version

3.12.2

Jupyter version

No response

Installation

None
@anntzer
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anntzer commented Sep 12, 2024 •
edited
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I suspect this is related to the scaling issues in #14159. A more minimal repro, for reference:

import matplotlib as mpl
print(mpl.__version__)
import matplotlib.pyplot as plt, matplotlib.patheffects

mpl.rcParams['text.latex.preamble'] = r'\usepackage[T1]{fontenc}'  # comment out to compare
plt.figtext(.5, .5, "aa\naaaaaaaaa", ma="right", usetex=True,
            path_effects=[mpl.patheffects.Normal()])
plt.show()

@anntzer anntzer mentioned this issue Mar 22, 2025
Closed
@anntzer anntzer mentioned this issue May 23, 2025
Merged
5 tasks
@QuLogic QuLogic added this to the v3.11.0 milestone May 28, 2025
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status: confirmed bug topic: text/usetex
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v3.11.0
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Use fix-cm instead of type1cm. anntzer/matplotlib
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@QuLogic @anntzer @yjzhu-solar