Adding to what James said...
Function names such as "sin" and "tan" are letter combinations, so no
special Unicode is required. Symbols such as the arrow for a ray or a
double-ended arrow for a line are part of the huge number of arrow symbols
defined in Unicode.
As James said, Unicode does not contain code points for the 2d math
notations. There are various mark up languages to specify those outside of
Unicode such as TeX, AsciiMath, and MathML. The later is supported in
liblouisutdml. You can find more information about Unicode glyphs in
http://www.unicode.org/reports/tr25/tr25-15.pdf. In particular, section 4.2
discusses Bidirectional Layout of Mathematical Text which seems relevant to
your project.
I hope that helps some,
Neil Soiffer
On Wed, Apr 22, 2020 at 6:34 AM James Bowden <James.Bowden@xxxxxxxxxxx>
wrote:
Hi Ikrami,
I'm sure the folks from APH will be able to comment further on this:
The "problem" with maths, at least printed maths, is that it is not a
linear arrangement of symbols. In particular:
fractions, superscripts, subscripts, radicals and embellishments, mean
that symbols are printed two-dimensionally.
Of course, in braille, and in a number of electronic representations of
maths, we linearise everything. TeX and LaTeX, for example, are popular
ways to write maths for the sighted world and it is a great starting point
for translation to other forms.
So, you will generally not find Unicode characters for the structural
elements of a mathematical expression - there are some exceptions.
I believe APH used some additional "special" characters to represent these
structural elements. I do not know the full set, but you can find some of
them in the file en-ueb-math.ctb, relating to Unified English Braille.
I do not have documentation and I don't know what produces these special
structural characters. I have not studied the file to see how complete it
is.
I trust this helps.
With best regards,
James.
-----Original Message-----
From: liblouis-liblouisxml-bounce@xxxxxxxxxxxxx [mailto:
liblouis-liblouisxml-bounce@xxxxxxxxxxxxx] On Behalf Of
ikrami.ahmad@xxxxxxxxx
Sent: 22 April 2020 14:11
To: liblouis-liblouisxml@xxxxxxxxxxxxx
Subject: [liblouis-liblouisxml] symbols that don't have unicode values
Hi
So I am working on adding Math symbols to the Arabic tables. There are
some symbols that don't have corresponding Unicode value, specially in
Geometry, like the Ray, line segments, overlines, and the math functions
like, Tan, Cos, Log and so on. How can I add those to my table?
Thanks
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