Centering ean13isbn barcode

Question

I am kindly requesting for assistance on how to center the ean13isbn barcode. I have tried using \centering or \begin{center}...\end{center} but the barcode still remains aligned to the left margin. Below is my MWE:

\documentclass{book}
\usepackage[ISBN=978-80-85955-35-4,SC0]{ean13isbn}
\begin{document}
    \EANisbn[SC3]
\end{document}

score 4 · Accepted Answer · answered Sep 03 '22 at 12:49

For unclear reasons, \EANisbn eventually does \vbox{...} and this is the cause of your problem: if \EANisbn appears between paragraphs it doesn't start one and the box is placed flush left whatever you try.

Add \leavevmode in front of \EANisbn or do

\mbox{\EANisbn{...}}

If you need the command several times, it makes sense to patch the relevant part so as to include \leavevmode.

\documentclass{book}
\usepackage[ISBN=978-80-85955-35-4,SC0]{ean13isbn}
\AddToHook{cmd/EANbox/before}{\leavevmode}
\begin{document}
Start a paragraph
\EANisbn[SC3] is not flush left, but aligned with the indentation above
\begin{center}
\EANisbn[SC3]
\end{center}
\end{document}

If you have an older (before October 2021) release of LaTeX, you can do the same job with \usepackage{etoolbox} and

\pretocmd{\EANbox}{\leavevmode}

instead of the \AddToHook line.

Centering ean13isbn barcode

1 Answers1