While working on my htmlwidget of the week katexR, I learned that MathJax can render in SVG. I know, I know, how did I not know that? Nevertheless once I made the discovery, I had the thought that I could render the SVG font glyphs (think beyond MathJax here) in R with rvest and htmltools. To get it to work requires very little effort after you work through a couple of kinks. The primary kink is that font glyphs are flipped, so you’ll need a transform = scale( 1, -1 ), but even better I used transform = scale( 0.75, -0.75 ) to fit the glyph in the small little window I gave it.
To replicate, check out the code.
# playing with MathJax svg fonts in R with rvest and htmltools
library(rvest)
library(htmltools)
"https://raw.githubusercontent.com/mathjax/MathJax/master/fonts/HTML-CSS/TeX/svg/MathJax_Typewriter-Regular.svg" %>>%
html %>>%
(~mj_glyph)
mj_glyph %>>%
html_nodes("glyph") %>>%
(
tagList(
lapply(
.
,function(g){
tags$div(
style = "height:100px;width:100px;float:left;"
,tag(
"svg"
,list(
id = paste0("glyph-",html_attr(g,"glyph-name"))
,viewBox = "0 0 1000 1000"
,style = "height:100%;width:100%;"
,tag(
"g"
,list(
transform = "scale(0.75,-0.75) translate(0,-1000)"
,tag(
"path"
,list("d" = html_attr(g,"d"),"")
)
)
)
)
)
)
}
)
)
) %>>%
html_print