[NTG-context] How to calculate the height of text of a certain width?

[Wolfgang Schuster]

Rudolf Bahr schrieb am 24.03.2020 um 12:19:
> Hello dear All,
> 
> the following MWE works best:
> 
> 
> \definelayer[LAY]
> \starttext
> 
> \setlayerframed[LAY]
>    [x=0pt,y=20pt]
>    [frame=on,
>     width=300pt,
>     align={right,}]   % tolerant}]
>    {\input ward }
>   
> \flushlayer[LAY]
> \stoptext
> 
> 
> Now, it could have a favourable effect on designing a page if the height of a text
> of certain width could be calculated in advance, depending of the font.
> Is there a way?
> 
> As I fear, TeX's means "\setbox" woun't work with aligned texts.

Can you give more details, I have no idea what you mean with aligned 
texts (layers?).

Wolfgang