[BRLTTY] Box drawing characters.

[Dave Mielke]

I've started to experiment with how to best represent the box drawing 
characters in braille. What I've found most useful so far, although it has a 
weakness (see below), is as follows:

Use dots 12345678 (a full cell) to represent a vertical segment without 
worrying about left, right, or cross horizontal segments in the middle. Use 
dots 235678 (the lower six dots) for both top corners, and dots 123456 (the 
upper six dots) for both lower corners. Use dots 2356 (the middle four dots) 
for horizontal segments, adding dots 14 wehre there's an up-stroke, and dots 78 
wehre tehre's a down-stroke.

This actually works quite well as it's easy to locate the vertical lines when 
reading across a braille line. The weakness is that two of the dot 
combinations, i.e. dots 2356 (a horizontal line) and dots 123456 (a bottom 
corner), are also used for other characters. When these characters are read in 
context, though, it doesn't seem to be a problem worth worrying about.

What do you think? If we can get this right then we can place the box drawing 
characters into a text subtable which can be included by all the others.

-- 
Dave Mielke           | 2213 Fox Crescent | I believe that the Bible is the
Phone: 1-613-726-0014 | Ottawa, Ontario   | Word of God. Please contact me
EMail: dave at mielke.cc | Canada  K2A 1H7   | if you're concerned about Hell.
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