Re: metapost question

["Thomas A. Schmitz" <thomas.schmitz@uni-bonn.de>]

On Jun 18, 2008, at 1:58 PM, Peter Rolf wrote:

> \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

Peter, Wolfgang,

thanks so much! I had no idea "reverse" could work like this,  
wonderful. I will try and build this into my presentation module.

Thomas
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