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

[Doug Ewell]

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
Get Outlook for Android<https://aka.ms/AAb9ysg>
________________________________
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, 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, 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/
>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://corp.unicode.org/pipermail/unicode/attachments/20230331/d925c6a8/attachment.htm>