[NTG-context] Colored text's background, which the more "lcd-mkiv"?

Elspeth McGullicuddy elspethmcgullicuddy at gmail.com
Fri Jan 17 20:33:57 CET 2014

On Fri, Jan 17, 2014 at 6:16 PM, Aditya Mahajan <adityam at umich.edu> wrote:
> On Fri, 17 Jan 2014, Elspeth McGullicuddy wrote:
>> [Colored text's background, which the more "lcd-mkiv"?;
>> plus: Metapost variable "text" with "\definetextbackground";
>> plus: {\input ward}]
>> Hi list,
>> What would be the best, also the more up to date, way to put colored
>> background behind text, that could cross page boundaries.
>> I have found three ways of doing this: I would like to know which is
>> best practice, and also the more "lua context document" fashion.
>> 1- Using "\startbar[underbar] \input zapf \stopbar" as described p. 39
>> of "hybrid.pdf".
> Use this one, unless the underbars are indequate, as was the case for the OP
> of the TeX.SX question.

This one is very easy to use, but I liked the rounded corners of the example.
Also I want it to fill the whole background, as it is the case with
\definetextbackground: it starts where you tell it to start, then fill
the whole text area, not only where there actually are glyphs, so it
keeps going on even if you put a \pagebreak, and stop when you tell it
to stop.
Instead \startbar[underbar] put color only where there are glyphs,
which is not what I'm looking for, unless there is way to do other
wise, but it would contradict the name underbar, so it seems unlikely.

So I think I'll go to \definetextbackground. And try some experiments
with the "MPposition" stuffs.

>> 2- Using "\startMPpositionmethod{mpos:placeholder}", found in
>> http://tex.stackexchange.com/questions/125162/rounded-box-around-placeholder-text-that-supports-line-breaking/125323
>> (Thanks to Aditya).
>> A bit tricky, but perhaps the more versatile or universal?
>> 3- Start with: "\definetextbackground" (same ref. as previous).
>> %%%%%%%%%%%%%
>> % About the third one I have had some difficulties, that might be
>> thought of as a bug.
>> % You might want and try the following example: it doesn't work if you
>> have a MetaPost variable
>> % whose name is "text".
> (Untested). Normally this means that there is already a variable with the
> name text. You can use:

Yes it's what I gathered. It took me some time to do so, though.

I didn't know of the "nuewnumeric" which is a good shortcut.

Thanks for this quick answer,

> save text; numeric text;
> or
> newnumeric text;
> which is shortcut for the former.
> Aditya

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