How do U+2571..U+2573 connect?

[Kent Karlsson]

I don’t see them in any of the G2 character sets in 
https://www.etsi.org/deliver/etsi_en/300700_300799/300706/01.02.01_60/en_300706v010201p.pdf
(ETSI EN 300 706 V1.2.1 (2003-04) European Standard (Telecommunications series) Enhanced Teletext specification).

/Kent K

> 1 apr. 2023 kl. 01:26 skrev Doug Ewell via Unicode <unicode at corp.unicode.org>:
> 
> They are in at least the T.101-G2 set, used for teletext.
> 
> —Doug
> 
> 
> 
> Sent via the Samsung Galaxy S22 Ultra 5G, an AT&T 5G smartphone
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> From: Unicode <unicode-bounces at corp.unicode.org> on behalf of Manuel Strehl via Unicode <unicode at corp.unicode.org>
> Sent: Friday, March 31, 2023 5:23:08 PM
> To: unicode at corp.unicode.org <unicode at corp.unicode.org>
> Subject: Re: How do U+2571..U+2573 connect?
>  
> Thanks for the answer! I almost thought that this was what’s going on. 
>  From looking at the Wikipedia page, 
> https://en.wikipedia.org/wiki/Box-drawing_character <https://en.wikipedia.org/wiki/Box-drawing_character>, it seems that those 
> three were not part of any larger legacy encoding. (The curved corners 
> come from Acorn Computers by the way, acording to that article.)
> 
> This leaves me wondering, where those three characters come from at all.
> 
> Manuel
> 
> Am 01.04.23 um 01:06 schrieb Asmus Freytag via Unicode:
> > The easy answer is that these do not consist of a single set. For 
> > example, the single-, double-line regular-stroke symbols and their 
> > combinations, form a subset that is supported by the DOS code page 
> > 437. Another common DOS code page (850) has only the single-line ones.
> >
> > Neither set contains any element that terminates in the middle of the 
> > cell.
> >
> > Those, as well as the heavy stroke or mixed weight combinations are 
> > presumably supported somewhere else, as are the curved corners. I 
> > don't know off hand what the character sets are from which these were 
> > derived, but again, I would not be surprised if they supported only a 
> > subset.
> >
> > The diagonals, therefore, are not necessarily from any of those 
> > subsets, and therefore likely never intended to be used to provide 
> > diagonal connections.
> >
> > A./
> >
> >
> > On 3/31/2023 3:46 PM, Manuel Strehl via Unicode wrote:
> >> Hi,
> >>
> >> if you look at the Box Drawing block, e.g., 
> >> https://codepoints.net/box_drawing <https://codepoints.net/box_drawing>, every character goes through the 
> >> middle of the edges of an imagined rectangle around the glyph. That 
> >> is, apart from U+2571, U+2572 and U+2573, the diagonal lines. Those 
> >> touch exclusively the corners of said rectangle.
> >>
> >> I fail to imagine how these three characters could ever attach to any 
> >> of the other characters in this block. Are they not meant to do that 
> >> or am I missing a trick here?
> >>
> >> Thanks for any pointers!
> >>
> >> Cheers,
> >> Manuel
> >>
> >> PS: This question was triggered by this reddit post: 
> >> https://www.reddit.com/r/Unicode/comments/127y7dn/looking_for_box_drawing_characters/ <https://www.reddit.com/r/Unicode/comments/127y7dn/looking_for_box_drawing_characters/>
> >
> >
> 

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