Altair make axis lines thicker

Question

I have an altair chart that looks like below. I would like to make the axis lines thicker as I (read: the reviewer of my paper) feel the current lines are too thin and are not easily visible on the screen. I tried looking at the Top-Level Chart Configuration, but I couldn't find anything that would allow me to do that. The closest thing I found that to use .configure_view(strokeWidth=4, stroke='black'), that makes the entire chart border thicker but I want just the axis lines to be thicker.

How do I make the axis lines thicker? Any help is appreciated.

Answer 1

It is controlled by domainWidth. e.g.

import altair as alt
from vega_datasets import data

source = data.movies.url

alt.Chart(source).mark_bar().encode(
    alt.X("IMDB_Rating:Q", bin=True, axis=alt.Axis(domainWidth=10)),
    y='count()',
)