How to change font in stem equations

[angelog0]

I wrote a document that uses stem equations and that I compile both with ascidoctor (to produce an HTML file) and asciidoctor-pdf (to produce a PDF file). With asciidoctor-pdf I use the extension asciidoctor-mathematical and mathematical-format=svg.

Now in PDF output the font used for the equations is very poor. I am following this document. There is a section about the font in SVG images but I do not understand how to change the font for stem equations: it reports the example for font in diagram not in stem equations.

In the following archive there are two example, one from an HTM file and one from a PDF file, to proof tha bad quality font in PDF.

font_demo.tar.gz

I would be grateful if you can suggest also a good font for that.

TIA,
Angelo.

[mojavelinux]

This has nothing to do with fonts. Asciidoctor Mathematical converts equations into SVG paths using mathematical (which uses the Math fonts at a low level, but what it makes are paths). Asciidoctor PDF then converts these paths into PDF objects using Prawn.

Right now, the height of the image cannot be controlled. It is preset by Asciidoctor Mathematical (based on a zoom level of 1). I always get a height 17px (which works out to 12.75pt) for a single line and 27px for multiple lines.

image:stem-44ecc32004b3425be206425da57c70cc.svg[width=114,height=17]

This one size fits causes problems if the base font size of your document doesn't match. Asciidoctor Mathematical needs to provide a way to customize the size, so please file an issue there.

As far as Asciidoctor PDF is concerned, this is a duplicate of this issue: #1483 (comment). The decision as to which size to use is made in Asciidoctor Mathematical, though as the issue suggests, we may provide hints back and forth to get it to fit better in the line.

[angelog0]

Thanks. I wrote #80