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(ARABIC) Mark Positioning

Posted: Fri Jul 13, 2018 1:33 am
by M Hatim Kausarali
Hi to all!!

I'm currently working on custom Arabic fonts.

Query: How to position every mark for every character/glyph differently?

There are around 16 marks in the Arabic language and every mark positioning is different from other and even for every character it is different and in ligatures it is more different positioning.

I tried 3 under character marks (kasra, kasratan and alef subscript) and positioned it in the OpenType Designer. I locked the mark with the option and tried for all the simple glyphs. it was done, and it worked well.

However, when I was trying for the above character marks I observed that the mark is positioned as before and changing it reflected on the different positioning on the previous under character marks.

The height of every character/glyph is different and the position of every mark for every character is also different, How to do this?

Please help me out.

Thank You.

Re: (ARABIC) Mark Positioning

Posted: Fri Jul 13, 2018 4:59 am
by Bhikkhu Pesala
I have no experience with using anchors, but I think you will need at least two anchors on the base glyph to which you wish to attach marks. One for marks below, and another for marks above.

Re: (ARABIC) Mark Positioning

Posted: Fri Jul 13, 2018 5:10 am
by M Hatim Kausarali
Thank You Sir,

I do understand that I need two anchors,
But please tell me how to associate first anchor with a group of marks (above the character)
and how to associate the second anchor with another group of marks (below the character).

Any guidance to it will surely be helpful.

I don't have any sort of help from any other than this forum.

My humble gratitude to the creator of this software and for this helpful platform(forum) too.

Thank You

Re: (ARABIC) Mark Positioning

Posted: Fri Jul 13, 2018 6:54 am
by Erwin Denissen
Do use the class manager to define the two groups of marks, then add those to the mark positioning lookup.

Re: (ARABIC) Mark Positioning

Posted: Fri Jul 13, 2018 9:05 am
by M Hatim Kausarali
Erwin Denissen wrote:
Fri Jul 13, 2018 6:54 am
Do use the class manager to define the two groups of marks, then add those to the mark positioning lookup.
Sir, as instructed I've made two class groups one with above character and other with below character.
Now, please guide how to add the mark positioning lookup?

I can't find any mark positioning lookup, I can see it in features, but how to assign anchor_1 for above and anchor _2 for below characters?
Pease help me sir.

Re: (ARABIC) Mark Positioning

Posted: Fri Jul 13, 2018 11:17 am
by Erwin Denissen
Select the feature (MarkPositioning) on the left side, then right-click and select New Item to add a mark to base lookup. From there add the base and mark glyph classes.

Re: (ARABIC) Mark Positioning

Posted: Fri Jul 13, 2018 1:59 pm
by M Hatim Kausarali
Thank You Sir Erwin,

I'll ask again if there is any query. Thanks a lot for your invaluable support.