[NTG-context] colored box background

[Hans Hagen]

Hans van der Meer wrote:
> Say I have a box, e.g. \setbox\thebox=\vbox{....} with dimensions 
> \wd\thebox etc.
> What then is the most efficient and economic (in terms of complexity 
> and speed) way to generate a colored background for it?�
> I know I can use \framed, but this I wish to avoid because it seems 
> overly complex for this simple task and may have side effects in terms 
> of alignment issues.
> Is the best perhaps using a metapost graphic? and if so, what is best 
> MPgraphic, useMPgraphic, reuseMPgraphic, etc.?
\backgroundline[red]{...}

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