PUA (Private Use Area) for RTL language

[malsahwwaf]

Hello,
How can I change the direction of PUA (Private Use Area) character to RTL Direction?

[Erwin Denissen]

You can't do that a natural way, but you can use a special character that tells the shaping engine to go RTL.

Start your text with the right-to-left override (RLO) character (code point $202E) which tells the word processing engine to process the remaining characters from right to left (RTL).

Here is the text "text shown from right to left" preceded with this special character:

‏‮text shown from right to left!

However as soon as a new line is detected this override stops and you have start with yet another right-to-left override character.

[malsahwwaf]

From (unicode.org) and (scripts.sil.org) sites: we can change the bidi property of the PAU characters to control its directional behaviour.

See following urls:

http://www.unicode.org/mail-arch/unicod ... /0613.html

https://www.unicode.org/reports/tr9/#Bi ... cter_Types

https://scripts.sil.org/cms/scripts/pag ... tutorial15

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My FC project only contains Arabic ligatures (See attachments)

ok, if we can't change the bidi property, Is there another method without using RLO?

[Erwin Denissen]

The ligatures will inherit RSB if they come from characters that are RTL, so with a correctly made Arabic font it should all work just fine and then you don't need PUA code-points at all.

[malsahwwaf]

if i don't use PUA code-psoints for my ligatures (keep it without codepoints), it doesn't appear in word 2016 after exporting and installing font?

Hints:

1- iam a bigginer in designing fonts (this is the first project for me)
2- my ligatures doesn't have a standard unicode codepoints (so i used the PUA to assign a codepoints for it).
3- i use (insert > Symbol) in word 2016 to insert my ligatures as symbol (see attachments)