how to change text direction on a pdf document

A character may possess LTR (for example, a Latin character), RTL (for example, a Hebrew character), or neutral directionality (for example, a punctualion mark). The directionality of a character is intrinsic to that character. In HTML the terms are 'paragraphs/divs/spans' and 'pages', whereas in plain text environments such as text editors and email there are no 'paragraphs' and the 'document' is always LTR. In other applications the terminology will be different, however the concepts remain the same. Note that I use the term 'paragraphs' and 'documents' here as the terms pertain to word processor files.

Characters' directionality is an intrinsic property, whereas paragraphs and documents have their directionality assigned to them.

Directionality is a property of characters, paragraphs, and documents. For purposes of this article, there exist three distinct directionalities: LTR, RTL, and neutral. The term directionality refers to the direction in which text flows from character to character. Special thanks to Stan Goodman for invaluable editorial advice. This article discusses those issues specific to Right-To-Left scripts, and provides working examples so that the reader may avoid the common issues. Fortunately, the Unicode encoding standard was developed, which addresses and provides solutions for nearly all of the issues encountered in non-Latin scripts' usage. This led to frustration and confusion, not to mention dataloss, when storing or transferring non-Latin scripts, or scripts not written from left to right. Unfortunately, many independent and incompatible attempts were made at accommodating differing language scripts and directionality. Although most early computer development was done by natives of Latin-based languages, the need to support additional scripts was realized fairly early.

How to change text direction on a pdf document