[NTG-context] Re: \inch not doing the expected thing (what I expect, anyway).

[Hans Hagen <j.hagen@xs4all.nl>]

On 11/12/2024 7:52 AM, Mikael Sundqvist wrote:
> Hi,
> 
> On Tue, Nov 12, 2024 at 12:20 AM Jim <zlists+context@jdvb.ca> wrote:
>>
>> On Mon, Nov 11, 2024 at 23:36 (+0100), Wolfgang Schuster wrote:
>>
>>> Jim schrieb am 11.11.2024 um 22:49:
>>>> On Mon, Nov 11, 2024 at 21:30 (+0100), Wolfgang Schuster wrote:
>>
>>>>> Jim schrieb am 11.11.2024 um 19:34:
>>>>>> Hi,
>>>>>>
>>>>>> I would expect (*cough*)
>>>>>>
>>>>>> \starttext
>>>>>> 2\inch
>>>>>> \stoptext
>>>>>>
>>>>>> to output something like
>>>>>>
>>>>>> 2"
>>>>>>
>>>>>> with some appropriate typographic symbols following the 2.  Instead, I get
>>>>>> a 2 with a large prime symbol down lower than a prime symbol should be, and
>>>>>> then a second prime symbol at about the correct size and at about the right
>>>>>> distance up from the baseline.
>>
>>>>> \setupbodyfont[pagella]
>>
>>>>> \starttext
>>
>>>>> \unit{2 arcminute}
>>>>> \unit{2 arcsecond}
>>
>>>>> \blank
>>
>>>>> 2\utfchar{0x2032}
>>>>> 2\utfchar{0x2033}
>>
>>>>> \blank
>>
>>>>> 2′ 2″
>>
>>>>> \stoptext
>>
>>>> Wolfgang,
>>
>>>> thanks very much for that example.
>>
>>>> However, while it does show me how to get the glyph I am looking for, I am
>>>> left wondering whether there is any way to do it without switching my font
>>>> from the default.  (And whether \inch is broken, or whether there is an
>>>> implicit assumption about font characteristics when using that macro.)
>>
>>>> I hate to go to the well too often, but would you care to comment
>>>> specifically about \inch and the default font?
>>
>>>> (If there is some document whose contents would enlighten me about this,
>>>> I'd be happy to get a pointer to it.)
>>
>>
>>> This is a problem for the math team.
>>
>>> The default font "Latin Modern" fakes the symbol with primes but the output
>>> with LMTX is wrong here (old MkIV has the correct symbol) as can be seen
>>> below.
>>
>>> \starttext
>>
>>> % Latin Modern uses \def\inch{\mathematics{\prime\prime}}
>>
>>> 2\m{\prime\prime}
>>
>>> % 2\m{^\doubleprime}
>>
>>> \stoptext
>>
>> Thanks for confirming that there is a problem.
>>
>> Is it safe to assume that this thread will get the attention of the math
>> team, so that they will put the issue on their To-Do list?  If not, I will
>> cheerfully file a bug report (at least if/when I find out where such a
>> report should be sent).
>>
>>                                 Jim
> 
> I will talk to Hans about it. The funny thing is that \m
> {f\prime\prime} works as expected. So, it is puting primes "on
> nothing" that needs to be considered. It seems to work in (many) other

Are inches still used? Anyway, I suppose no mathematician will put a 
prime on nothing.

> fonts, so, we'll have to look at modern and what is special there.

Does this work ?

\permanent\protected\def\inch
   {\iffontchar\font`″″\else
      \mathematics
        {\mathsurround\zeropoint
         \mathatom\mathunspacedcode
         {\strut}″}%
    \fi}


Hans


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                                           Hans Hagen | PRAGMA ADE
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