From: Philipp Reichmuth (email@example.com)
Date: Wed Oct 20 2004 - 15:37:07 CST
Jony Rosenne schrieb:
> In my understanding, there is no interaction between bidi and vertical text.
> Whether you write rtl text top to bottom or bottom to top has nothing to do
> with bidi. When you mix rtl and ltr you would normally continue writing them
> in logical order when you write ttb or btt. Rtl and ltr are only meaningful
> in horizontal writing.
In theory, you could have bits of both rtl and ltr, embedded in vertical
text, then you have the bidi problem again. Whether it is a problem
partly depends on whether you want your glyphs rotated.
You might want to take a look at the directionality documentation for
the Omega extensions of the TeX typesetting system, where they tried to
come up with a coherent, universal directionality model that includes
rotation and even mirroring of characters:
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