Thomas A. Schmitz schrieb:
> Hi all,
>
> probably an easy question: for a presentation, I would like to have an
> area of my slide highlighted by placing a transparent grey layer on
> top of the slide and having one area of this layer completely
> transparent, a bit like this screenshot:
> http://debaday.debian.net/wp-content/uploads/2007/05/key3.jpg
> Any suggestions for the easiest way to achieve this effect?
>
> Thanks
>
\startuniqueMPgraphic{dim:and:focus}{fw,fh,fx,fy,c}
begingroup
save q ;
path q;
q:= (unitsquare xyscaled(\MPvar{fw},\MPvar{fh})
smoothed 4px)
shifted (\MPvar{fx},\MPvar{fy});
fill OverlayBox--reverse q-- cycle withcolor \MPvar{c} ;
% draw q withpen pxcpen withcolor darkgray;
setbounds currentpicture to OverlayBox ; % just to be safe in case of
outside focus rectangle
endgroup;
\stopuniqueMPgraphic
no further explanations :D
best wishes, peter
> Thomas
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : https://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
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