[NTG-context] understanding units / dimensions

[NTG-context] understanding units / dimensions

[Henning Hraban Ramm]

At the meeting I noted a few units that I didn’t know about, while I 
already knew many.

* general units: in, m, cm, mm (ft?)
* typographical units: pt, dd, bp, pc, cc, sp
* font related: em, ex, fs, fa, fd, fc, ch
* layout related: pw, ph, tw, th, cw, cd, lw, hs, vh
* frame related: fw, fh, fo
* funits: dk, es, tv, eu

Are there even more?

(Did you know all of them? This will be in the test…)


Questions:

How differs "1" from "2"?
* em fs
* lw hs
* ph vh


I want to update https://wiki.contextgarden.net/Dimensions

Hraban
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[NTG-context] Re: understanding units / dimensions

[Wolfgang Schuster]

Henning Hraban Ramm schrieb am 25.08.2024 um 13:45:
> At the meeting I noted a few units that I didn’t know about, while I 
> already knew many.
>
> * general units: in, m, cm, mm (ft?)
> * typographical units: pt, dd, bp, pc, cc, sp
> * font related: em, ex, fs, fa, fd, fc, ch
> * layout related: pw, ph, tw, th, cw, cd, lw, hs, vh
> * frame related: fw, fh, fo
> * funits: dk, es, tv, eu
>
> Are there even more?

Yes, there are more of them.

Look into the lowlevel-registers document which describes how they are
created and also how you can define your own identifiers with \newuserunit.

> Questions:
>
> How differs "1" from "2"?
> * em fs

\startbuffer[dimensions]
\starttabulate
\NC em \EQ \the\dimexpr1em\relax \NC\NR % \emwidth
\NC fs \EQ \the\dimexpr1fs\relax \NC\NR % \globalbodyfontsize
\stoptabulate
\stopbuffer

\starttext

\getbuffer[dimensions]

\setupbodyfont[14.4pt]

\getbuffer[dimensions]

\stoptext


> * lw hs

lw stands for \linewidth which is the default value for rulethickness in 
\framed etc.

hs is just \hsize.

> * ph vh

ph is \paperheight.

vh doesn't exist.


Wolfgang

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[NTG-context] Re: understanding units / dimensions

[Henning Hraban Ramm]

Am 25.08.24 um 14:15 schrieb Wolfgang Schuster:
>> Are there even more?
> 
> Yes, there are more of them.
> 
> Look into the lowlevel-registers document which describes how they are
> created and also how you can define your own identifiers with \newuserunit.

Thank you! There must have been a manual, but I didn’t guess “registers” 
was relevant.

>> Questions:
>>
>> How differs "1" from "2"?
>> * em fs

> \NC em \EQ \the\dimexpr1em\relax \NC\NR % \emwidth
> \NC fs \EQ \the\dimexpr1fs\relax \NC\NR % \globalbodyfontsize

Ok, so they can differ minimally; in my 10pt setup I get the same value.

>> * lw hs
> 
> lw stands for \linewidth which is the default value for rulethickness in 
> \framed etc.

I mixed up \linewidth with \textwidth, thought the one was LaTeX and the 
other \ConTeXt, since we’re talking about rulewidth otherwise.

> hs is just \hsize.

Then it makes sense.

>> * ph vh
> ph is \paperheight.
> vh doesn't exist.

Ok, I had mis-noted vh from some older talk, meeting, or whatever, and 
forgot vs.

Hraban
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[NTG-context] Re: understanding units / dimensions

[Henning Hraban Ramm]

Am 25.08.24 um 15:52 schrieb Henning Hraban Ramm:
>> vh doesn't exist.
> 
> Ok, I had mis-noted vh from some older talk, meeting, or whatever, and 
> forgot vs.

Stumbled upon it again:
At the end of https://www.tug.org/TUGboat/tb42-3/tb132hagen-dk.pdf
Hans wrote:

vw (relative to the \hsize), vh (relative to
the \vsize), maybe a percentage (but of what) and
ch (width of the current zero digit character).

As if that wasn’t official documentation…

WRT to funits see also 
https://www.tug.org/TUGboat/tb44-2/tb137egger-edith.pdf

HR
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[NTG-context] Re: understanding units / dimensions

[Hans Hagen via ntg-context]

On 8/25/2024 2:15 PM, Wolfgang Schuster wrote:

>> How differs "1" from "2"?
>> * em fs
> 
> \startbuffer[dimensions]
> \starttabulate
> \NC em \EQ \the\dimexpr1em\relax \NC\NR % \emwidth
> \NC fs \EQ \the\dimexpr1fs\relax \NC\NR % \globalbodyfontsize
> \stoptabulate
> \stopbuffer
> 
> \starttext
> 
> \getbuffer[dimensions]
> 
> \setupbodyfont[14.4pt]
> 
> \getbuffer[dimensions]
> 
> \stoptext
Often they are the same (basically font units) but there can be some 
rounding going on; also bodyfont sizes are clipped

\starttext
     \the\numexpr(\dimexpr1fs\relax/65536)*100\relax\par
     \the\numexpr(\dimexpr1em\relax/65536)*100\relax

     \the\dimexpr1fs\relax\par
     \the\dimexpr1em\relax
\stoptext

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