[luatex] \boxdir primitive

Vafa Khalighi persian-tex at tug.org
Fri Sep 13 09:12:11 CEST 2013

no worries. I finally understood how that works.

\setbox0\hbox{This is a test.}
\boxdir 0 TRT

so the syntax is \boxdir <box register> <direction>

On Fri, Sep 13, 2013 at 5:07 PM, Vafa Khalighi <persian-tex at tug.org> wrote:

> Hi
> How \boxdir primitive work? if I give \boxdir TRT, I get error and luatex
> expects the argument to be a number. I tried giving different numbers but
> this time it complained that "that is a bad direction". However \boxdir
> 0TRT gives no error (actually you can replace 0 with any other number) but
> that would not change the direction of any box.
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