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

[Asmus Freytag]

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/

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