Python Altair Charts when rendering to PDF

[hathawayj]

The Altair charts are rendered to HTML output without an issue. My first try to create PDF output failed. I thought it might, as Altair is a bit of a pain to convert to static graphics. Any guidance on how rendering to PDF might work for Altair charts with Quarto?

[jjallaire]

We will eventually create a generic mechanism for converting HTML/SVG to raster graphics for PDF output (probably not for a few months though). cc @cscheid

[hathawayj]

That is great. It is a bit of a mess teaching Altair when asking the students to export their images to png. Quarto will go a long way to making setup less painful. Looking forward to the update.

[ganong123]

@jjallaire I'm having the same problem now that @hathawayj was having two years ago!

Was there any resolution?

[mcanouil]

@ganong123 I suggest you open a new discussion and/or add a fully reproducible example.
For example, a complete Quarto document or a Git repository.
The goal is to make it as easy as possible for us to recreate your problem so that we can fix it: please help us help you! Thanks.

---

You can share a self-contained "working" (reproducible) Quarto document using the following syntax, i.e., using more backticks than you have in your document (usually four ````).
See https://quarto.org/bug-reports.html#small-is-beautiful-aim-for-a-single-document-with-10-lines.

If you have multiple files (and if it is absolutely required to have multiple files), please share as a Git repository.

R	Python
````qmd --- title: "Reproducible Quarto Document" format: html engine: knitr --- This is a reproducible Quarto document. {{< lipsum 1 >}} ```{r} x <- c(1, 2, 3, 4, 5) y <- c(1, 4, 9, 16, 25) plot(x, y) ``` {#fig-placeholder} {{< lipsum 1 >}} The end after @fig-placeholder. ````	````qmd --- title: "Reproducible Quarto Document" format: html engine: jupyter --- This is a reproducible Quarto document. {{< lipsum 1 >}} ```{python} import matplotlib.pyplot as plt x = [1, 2, 3, 4, 5] y = [1, 4, 9, 16, 25] plt.plot(x, y) plt.show() ``` {#fig-placeholder} {{< lipsum 1 >}} The end after @fig-placeholder. ````

Additionally and if not already given, please share the output of quarto check within a code blocks (i.e., using three backticks ```txt), see https://quarto.org/bug-reports.html#check.

[MarekOzana]

I created new bug report with reproducible example:
#10571
Thank you for your time

[mcanouil]

I wrote a GitHub Discussion not an issue.

[MarekOzana]

I think it is an issue, one cannot use altair charts with Beamer or PDF docs. One needs to go back to matplotlib.
Just to relate, like if Quarto worked for R standard plotting library but not for ggplot, then it would be big thing ;)

[mcanouil]

Just to relate, like if Quarto worked for R standard plotting library but not for ggplot, then it would be big thing ;)

This isn’t about prioritising the issue. Sometimes, Python/Jupyter (like R/knitr) requires slightly different syntax to function correctly, which isn’t related to Quarto. Beginning with a discussion allows us to investigate and determine if it’s a Quarto bug. If it turns out not to be a bug, it prevents unnecessary “noise” in the issues.