Re: 10+ reasons why I still use MKII

From: Khaled Hosny <khaledhosny@eglug.org>
To: Hans Hagen <pragma@wxs.nl>
Cc: "mailing list for ConTeXt users" <ntg-context@ntg.nl>,
	"Idris Samawi Hamid ادريس سماوي حامد" <ishamid@colostate.edu>,
	"Mojca Miklavec" <mojca.miklavec.lists@gmail.com>
Subject: Re: 10+ reasons why I still use MKII
Date: Fri, 14 May 2010 16:10:30 +0300	[thread overview]
Message-ID: <20100514131030.GA6234@khaled-laptop> (raw)
In-Reply-To: <4BED4819.20805@wxs.nl>

On Fri, May 14, 2010 at 02:54:49PM +0200, Hans Hagen wrote:
> On 14-5-2010 2:37, Khaled Hosny wrote:
> >On Thu, May 13, 2010 at 11:35:58PM +0200, Hans Hagen wrote:
> >>On 13-5-2010 11:26, Khaled Hosny wrote:
> >>>On Thu, May 13, 2010 at 10:25:06PM +0200, Hans Hagen wrote:
> >>>>On 13-5-2010 10:06, Khaled Hosny wrote:
> >>>>
> >>>>>Nothing special, I always expect interline space to be fixed, I don't
> >>>>>know if TeX always make interline spacing variable, but this wasn't an
> >>>>>issue with English text. However, with Arabic, Tashkil marks seems to
> >>>>>always cause a noticeable extra whitespace above the line.
> >>>>>See the uneven distribution of vertical whitespace in this example (it
> >>>>>can be even worse than this in reality):
> >>>>
> >>>>for arabic you really need to set the interline space (idris might
> >>>>have more input on this)
> >>>>
> >>>>- it has more height than depth
> >>>
> >>>Not always عٍ or فيٍ is as deep as high is أً.
> >>
> >>so for say 12pt arabic we should use 8pt ht and 8pt depth?
> >
> >I'm not sure about this, but I'd rather trust the font designer for
> >knowing better about his font, and something like in the attached file
> >(except it doesn't work :) see my other mail)
> 
> it's a gray area ... if we obey the ht/dp spec of a font (ascender
> and descender) we end up with an unpredictable mess (actually
> comparable to setting the baselineskip to 0pt and trusting the ht/dp
> of glyphs to force the right line spacing)
> 
> in dtp there's aways this rather strict grid

At least it should be there as an option, and contrary to ht/dp of the
glyphs, typo ascender/descender are font wide values thus will be the
same for all lines (math is an exception).

Regards,
 Khaled

-- 
 Khaled Hosny
 Arabic localiser and member of Arabeyes.org team
 Free font developer
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