Re: offset for background overlay

[mf <massifr@fastwebnet.it>]

>> Or maybe a method in MP to set the bounding box of the resulting overlay?
> 
> setbounds in combination with leftenlarged, topenlarged etc.
> 
Thanks Wolfgang, this is the kind of solution I was looking for:

\startuseMPgraphic{cell:triangle}
   path p ; p := unittriangle rotated 90 xscaled 2.5 OverlayWidth 
yscaled 2.5 OverlayHeight ;
   draw p withcolor red ;
   setbounds currentpicture to p topenlarged 6mm ;
\stopuseMPgraphic
\defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
\starttext
\bTABLE[frame=off]
   \bTR
     \bTD[nx=2,align=middle,background=triangle] \dontleavehmode a\crlf 
text \eTD
   \eTR
   \bTR[toffset=1mm]
     \bTD left \eTD
     \bTD right \eTD
   \eTR
   \bTR
     \bTD another \eTD
     \bTD row \eTD
   \eTR
\eTABLE
\stoptext

Thanks also for the explanation of backgroundoffset: it's an offset 
relative only to the background, and it moves in the opposite direction 
of the content offset of \framed.

Looks like \framed[...,offset=VALUE,backgroundoffset=frame,...] is 
equivalent to \framed[...,offset=VALUE,backgroundoffset=-VALUE,...].

I tried to add something to the WIKI to show how it works, but the 
previews I got were not consistent with what I'm obtaining on my PC 
(with LMTX and "context --luatex"), so I gave up.

Massi
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