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

Elspeth McGullicuddy elspethmcgullicuddy at gmail.com
Fri Jan 17 17:33:48 CET 2014


[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".

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".

\starttext

\startMPcode

%  numeric text; %% Try and uncomment this line

  drawarrow (0,0)--(3cm,1cm);
\stopMPcode

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\definecolor [lightblue] [r=0.5, g=0.5, b=1]

\definetextbackground
    [placeholder]
    [
      location=text,
      background=color,
      backgroundcolor=lightblue,
      frame=on,
      corner=round,
      radius=0.8\lineheight,
    ]

\placeholder{\input ward }

% \placeholder{\input ward} %% Try and uncomment this line

\stoptext


% Local Variables:
% mode: context
% coding: utf-8
% End:

Regards,
Chris


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