Plots, GR backend & math in titles

[B-LIE]

Seems like there is a slight problem with the GR back-end of Plots when it comes to math in titles. Here is an example:

Notice that the math does not align well with the non-math text (e.g., the $N$ at the end is too low; the same is true of the other math). Also observe that here, I inserted word "and" in the math part; if I didn't do that, it looked considerably worse.

Apart from this, I'm very happy with the GR package (OK -- there may be other minor issues). I stopped using the PyPlot backend some time ago -- essentially because (i) it stopped working properly, and (ii) GR gave crisper lines, and overall nicer looking plots.

[B-LIE]

Hm -- the same problem seems to be present in labels:

[jheinen]

Could you please provide a MWE? Thanks.

[B-LIE]

I use Julia 1.8.3 on Windows 11, an HP laptop with Full HD resolution.

using Plots
using LaTeXStrings
plot(sin, label=L"this is $f(x)$")
plot!(title=L"$\sin$ as a function of $x$")
plot!(xlabel=L"position $x$")
plot!(ylabel=L"mapping $\sin(x)$")

I saved the plot as svg:

savefig("C:/Users/.../OneDrive/Desktop/test.svg")

I then drag the svg-file into a blank Word document, where I can zoom to see the figure in detail.

Parts of plot

In the title line, $\sin$ is somewhat below the baseline of the text; $x$ is somewhat above.

I'd say that $f(x)$ is the slightest below the base line of the text in the legend/label.

The ylabel... The math appears as slightly below the baseline of the ylabel -- and somewhat smaller. Same for xlabel.

I've seen more marked differences in baseline of text and math in other examples.

[jheinen]

Could you please execute the following commands and provide a screenshot?

using GR
using LaTeXStrings

text(0.1, 0.9, L"this is $f(x)$")
text(0.1, 0.8, L"$\sin$ as a function of $x$")
text(0.1, 0.7, L"position $x$")
text(0.1, 0.6, L"mapping $\sin(x)$")
settextfontprec(232, 3)

text(0.1, 0.4, L"this is $f(x)$")
text(0.1, 0.3, L"$\sin$ as a function of $x$")
text(0.1, 0.2, L"position $x$")
text(0.1, 0.1, L"mapping $\sin(x)$")

updatews()

[B-LIE]

Will do when I'm back at computer.

Sent from Outlook for Androidhttps://aka.ms/AAb9ysg

---

From: Josef Heinen @.> Sent: Monday, February 27, 2023 7:01:28 PM To: jheinen/GR.jl @.> Cc: Bernt Lie @.>; Author @.> Subject: Re: [jheinen/GR.jl] Plots, GR backend & math in titles (Issue #512)

Could you please execute the following commands and provide a screenshot?

using GR using LaTeXStrings

text(0.1, 0.9, L"this is $f(x)$") text(0.1, 0.8, L"$\sin$ as a function of $x$") text(0.1, 0.7, L"position $x$") text(0.1, 0.6, L"mapping $\sin(x)$") settextfontprec(232, 3)

text(0.1, 0.4, L"this is $f(x)$") text(0.1, 0.3, L"$\sin$ as a function of $x$") text(0.1, 0.2, L"position $x$") text(0.1, 0.1, L"mapping $\sin(x)$")

updatews()

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[B-LIE]

I restarted the Jupyter notebook (in VSCode), and ran exactly the code you suggested above.

The code runs without problems, but there is not output/response on the screen except that it runs the code:

[jheinen]

You can run these commands only in a console window.

[B-LIE]

You can run these commands only in a console window.

OK -- then I get the following:

[jheinen]

I have no explanation yet why the alignment depends so much on the font - with plain GR text (and without embedded LaTeX strings) the positioning in GR is pixel-precise. We will have a closer look at this ...