Linux Biolinum Keyboard missing euro currency symbol

Question

Some keyboards provide a key with the € currency symbol (U+20AC), but the Linux Biolinum Keyboard font is missing it, though:

it does provide some currency symbols,
Linux Libertine does provide this symbol,

as shown by the following MCE:

\documentclass{article}
\usepackage{libertine}
\begin{document}
€ \LKey{uni00A5} \LKey{uni0024} \LKey{uni00A3} \fbox{\LKey{uni20AC}}
\end{document}

Is there a way (even a poor man's one) to get the € in Linux Biolinum Keyboard?

Edit

BTW, the same deficiency is affecting the Libertinus fonts fork of Linux Libertine.

Not satisfactory, but the only thing I can think of is to create a small image in the style of the other currency symbols, and use that. — Ingmar, May 03 '22 at 14:02
@Ingmar Hey, not that bad! :) I'll adopt this workaround if nothing less dirty comes up ;) — Denis Bitouzé, May 03 '22 at 14:16

score 9 · Answer 1 · answered May 03 '22 at 22:46

9

Bad hack: use the keyboard centered dot, cover the dot with a white larger centered dot and print the Euro symbol above it.

\documentclass{article}
\usepackage{libertine}
\usepackage{xcolor,graphicx}
\newcommand{\LKeyEuro}{{%
  \ooalign{%
    \LKey{uni00B7}\cr % the keyboard centered dot
    \hidewidth % a centered dot in white to mask off
      \sffamily
      \kern-0.06em
      \raisebox{-0.03ex}{\scalebox{1.1}{\color{white}\char"B7}}%
    \hidewidth\cr
    \hidewidth % the Euro sign
      \sffamily
      \kern-0.075em
      \raisebox{0.125ex}{\scalebox{0.75}{€}}%
    \hidewidth\cr
  }%
}}
\begin{document}
\LKeyEuro\ \LKey{uni00A5} \LKey{uni0024} \LKey{uni00A3}
\end{document}

answered May 03 '22 at 22:46

egreg

1,121,712

3

This bad hack works nicely! Except if the background color of the page isn't white :) And https://tex.stackexchange.com/q/559826/18401 leaves little hope... – Denis Bitouzé May 04 '22 at 05:33
3

@DenisBitouzé I’m wondering why the authors of the font didn’t think to add a blank key shape. – egreg May 04 '22 at 07:23
1

@DenisBitouzé Another strategy could be to produce with standalone a picture of one key, edit the PDF to remove the character inside and use it as above. – egreg May 04 '22 at 15:24

score 4 · Answer 2 · answered May 03 '22 at 15:35

Linux Biolinum Keyboard is licensed under the GPL, so you can modify the font to add the Euro glyph using an application such as FontForge. You should be able to copy an existing character to create the key-shaped border. If another variant of Linux Biolinum includes a Euro glyph, you can combine the existing glyph with the border. The FontForge editor works like other vector graphics applications, with nodes and handles for adjusting the shapes. Design with FontForge offers helpful instructions.

Well, beyond my scope I'm afraid. I opened a feature request, with little hope since the project seems to be not very active. I also opened a feature request on the Libertinus fonts fork. — Denis Bitouzé, May 04 '22 at 06:38

score 3 · Answer 3 · answered May 03 '22 at 15:28

There is a new package on ctan: circledtext. Something to play with and postpone the boring things. See yourself:

\documentclass[24pt, parskip=full]{scrartcl}
\usepackage{libertine}
\usepackage{circledtext, xcolor}
\circledtextset{boxtype=OO, boxlinewidth=0.5pt, charf=\sffamily, charshrink=0.5,
  yscale=1.5, width=2em, resize=real}
\newcommand{\clb}[1]{\circledtext*{#1}}
\newcommand{\cls}[1]{\circledtext{#1}}
\begin{document}
\cls{T} \cls{y} \cls{p} \cls{e},\clb{:} \cls{€}
\clb{T} \clb{y} \clb{p} \clb{e},\cls{:} \clb{€}
Or even:
\circledtextset{boxtype=O, boxlinewidth=0.5pt, charf=\sffamily\bfseries, charshrink=0.5,
  yscale=1.5, width=2em, boxfill=red!50, charcolor=white, resize=real}
\circledtext{€}
\end{document}
% Local Variables:
% TeX-engine: luatex
% End:

Linux Biolinum Keyboard missing euro currency symbol

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