Fix and document font issues with PDF

[petrbouchal]

"invalid font"

• see Problems with registering Roboto Condensed on macOS hrbrmstr/hrbrthemes#18 and
• the solution should be to implement our own font import with own files - specifically with files in hrbrthemes but without RC Light
• or do above and also run code suggested as fix in Problems with registering Roboto Condensed on macOS hrbrmstr/hrbrthemes#18 as part of import_fonts().

"dot substituted..."

• see https://stackoverflow.com/questions/13251665/rhtml-warning-conversion-failure-on-var-in-mbcstosbcs-dot-substituted-f/13299607#13299607 - probably only relevent on Macs?

Also need note on embed_fonts().

Alternatively, it seems cairo_pdf does not throw the latter error, at least on a Mac.

[petrbouchal]

@jaromir-mazak @alesvomacka can you let me know if in the end you do need the PDF template/way to output PDF docs? If so, I may have figured out an optimal way to handle reschola-themed fonts in charts for PDF, but it would require some testing on your machines. (I would leave the LaTex styling to you though...)

[alesvomacka]

@petrbouchal I would definitely appreciate it.

[petrbouchal]

@alesvomacka did any of what I suggested via email re fonts work?

[alesvomacka]

@alesvomacka did any of what I suggested via email re fonts work?

@petrbouchal word graph changes work (the size of graphs needs to be changed through aspect ratio, not directly).

As for PDF, no combination of solutions work for me.

[petrbouchal]

OK - can you please try to 'Knit' (via RStudio button) the Rmd file in the attached ZIP and post back the resulting PDF after running extrafont::embed_fonts("reschola_pdf_fonts_testpad.pdf")?
reschola_pdf_fonts_testpad.Rmd.zip

[netique]

There is schola_pdf format now in v0.2.13.9000. Please check & close.