Arabic Right to Left using Luatex

Question

I need to write some text in arabic using Latex. It is important for me to compile the tex file using Lualatex (here I report a minimal working example, but the document class I am originally using needs Lualatex).

Everything works fine except from the fact that the text is printed in the wrong direction. Any suggestion on how to fix this?

\documentclass{article}

\usepackage{fontspec}
\newfontfamily\afont[Script=Arabic]{Amiri}
\usepackage[voc]{arabtex}
\begin{document}


        \afont{استطلاع}


\end{document}

Answer 1

I do not have the arabtex package. However, I suppose you are looking for something like:

[...]
\def\setArabic{\pagedir TRT \bodydir TRT \pardir TRT \textdir TRT}
\def\setLatin {\pagedir TLT \bodydir TLT \pardir TLT \textdir TLT}

\begin{document}

\setArabic\afont    
استطلاع
[...]