[NTG-context] Re: increase vertical between underbrace and equation

[Mikael Sundqvist <mickep@gmail.com>]

Hi,

On Mon, Dec 18, 2023 at 6:57 PM Dean Hung <deanyhung@gmail.com> wrote:
>
> Hi ConText friends,
>
> I am trying to increase the vertical distance between the underbrace and the part of the equation above the underbrace.
>
> \startformula
> \underbrace{x+y+z}_{\blank[1cm]\mathrm{my text here}}
> \stopformula
>
> I've tried using \blank and \vspace, but to no avail.  For example:
>
> \underbrace{x+y+z}_{\blank[1cm]\mathrm{my text here}}
> ...does not work.
>
> The documentation on underbrace (and overbrace, underbracket, etc...) in the ContextGarden wiki seems to be very limited, and I was not able to find any user-supplied arguments for increasing this vertical distance.
>
> There are various solutions available for LaTex, and they require external packages (e.g., BigStrut, vphantom) that redefine the strut height.
>
> I hope I'm missing something simple... Any help would be greatly appreciated!
>
> DY Hung

One could enforce consistent spacing by doing (add \showstruts)

\underbrace{x + y + z}_{\topstrut\mtext{my text here}}

but it would perhaps make more sense to be able to do

\underbrace[toptext=...,bottomtext=...]{x + y + z}

with some mechanism that do not abuse the limits mechanism, or even to
have some very general annotation mechanism,

\mathannotation[toptext=...,bottomtext=...]{\underbrace{x + y + z}}

So, can we please see some real examples of how this is supposed to be
used? Best with some explanations on how and why the text below should
be raised/lowered.

/Mikael
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