fontstyle does not work with geom_text

[machow]

possibly related to #940

Using plotnine version '0.15.0a2.post3+g2cdc487f'

import pandas as pd
from plotnine import *

df = pd.DataFrame({"x": [1, 2, 3], "fontstyle": ["normal", "italic", "oblique"]})

(ggplot(df, aes(1, "x")) + geom_text(aes(label="fontstyle", fontstyle="fontstyle")))

[has2k1]

This is a matplotlib issue. It cannot handle fontstyle for fonts that pack all they styles in a single file i.e. .ttc The default font is Helvetica, if you have it installed and it is probably a single Helvetica.ttc!

You can check with:

import matplotlib.font_manager as fm
for font in fm.findSystemFonts():
    if "helvetica" in font.lower():
        print(font)

If you try DejuVu Sans or Arial the fontstyle should work.

import pandas as pd
from plotnine import *

df = pd.DataFrame({"x": [1, 2, 3], "fontstyle": ["normal", "italic", "oblique"]})

(
    ggplot(df, aes(1, "x"))
    + geom_text(aes(label="fontstyle", fontstyle="fontstyle"), family="Arial")
)

[machow]

Ah, thanks for clarifying! This is super helpful! Feel free to close if useful