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Indic Script labels not rendered correctly #8765
Description
Bug report
Bug summary
Title sums it up all I guess.
Related:
Here I used sinhala as Indic Script instance.
I think the font family has to do something with this issue since output to different font families are different. I'm not an expert in these stuff. Help appreciated to to get this work even with a different font family.
An example is given below for which I've tried with 3 different font families.
Code for reproduction
from matplotlib import rc
families = ['WARNA','LKLUG','Arial']
for familyname in families:
rc('font', family=familyname)
from matplotlib import pyplot as plt
import numpy as np
r = np.linspace(0.1,5,100)
A = 3*2/(r*2)+np.pi*r**2
fig = plt.figure()
axes = fig.add_axes([.1,.1,.8,.8])
axes.plot(r,A)
axes.set_ylabel(u'වර්ගඵලය')
axes.set_xlabel(u'අරය')
axes.set_title(familyname)Actual outcome
Expected outcome
Result 1 looks fine but it has 2 problems:
- Accents not been placed in the correct location. ("්" in "වර්ගඵලය" is placed after "ර" not before)
- Letter "A" is not renderd in the title "WARNA"
Issues in result 2:
- Same previous accent issue
- Axis values or title not shown at all
Issues in result 3:
- No Sinhala script shown.
Versions
| Software | Version |
|---|---|
| Python | 2.7.13 64bit [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] |
| IPython | 5.1.0 |
| OS | Linux 4.4.0 78 generic x86_64 with debian jessie sid |
| matplotlib | 1.5.1 |
(Matplotlib from anaconda bundle)
Wed Jun 14 22:54:11 2017 +0530
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anntzer commentedon Jun 23, 2017
The misplaced accent is due to lack of support for combining characters at the freetype level (e.g. https://stackoverflow.com/questions/9985340/how-to-render-combined-unicode-characters-in-freetype). Using a real text layout engine (MEP14) is probably not going to happen any time soon :-/
Not sure what's happening with the missing A (well I guess the glyph is missing? unlikely though) and the missing title of case 2.
Case 3 is just that Arial does not provide Indic characters (in all likelihood) so you're out of luck.
anntzer commentedon Nov 4, 2017
/self-promotion/ mplcairo now supports complex text layout using libraqm, this was suprisingly easy to add...
baabsa commentedon Feb 24, 2018
can you please illustrate steps for adding and use (libraqm),
I am new in python and I didn't find an easy explanation how it is used.
Thanks in advance.
anntzer commentedon Feb 24, 2018
It is a fairly technical project and will probably not be implemented any time soon.
But most solutions that fixes indic script will likewise fix arabic script (*well technically you can have a shaper without RTL support but let's not get there).
baabsa commentedon Feb 24, 2018
this issue doesn't appear in printing an Arabic word from DataFrame, it is only appear when I have Arabic words in plot as x axes, y axes, or title!
1 remaining item
anntzer commentedon Jul 5, 2019
Actually this issue is basically already tracked at #5941, so I'll close this one as a duplicate.
QuLogic commentedon Jun 5, 2025
Not sure why this is a duplicate of #5941, but that's closed and this issue isn't actually fixed.
QuLogic commentedon Apr 10, 2026
The
text-overhaulbranch is now merged tomain.