Re: MPgraphic with rounded corners

[Wolfgang Schuster <schuster.wolfgang@googlemail.com>]

Am 15.01.2009 um 18:26 schrieb Duncan Hothersall:

> Hello all.
>
> I have adapted a bit of MP code from Aditya from a mailing list  
> message dated 2006-05-19 (http://archive.contextgarden.net/message/20060519.214124.9174ac0e.en.html 
> ) to ensure that when a page break occurs in a textbackground there  
> is a forced vertical space inside the box at the top of the new page.
>
> This code works fine for me (although interestingly not in the  
> garden):
>
>
> \setupcolors[state=start]
>
> \startuseMPgraphic{mpos:par:myexample}
> path p;
> for i = 1 upto nofmultipars :
> p := multipars[1] topenlarged 8pt bottomenlarged 8pt;

p := multipars[1] topenlarged 8pt bottomenlarged 8pt smoothed 2mm ;

> fill p withcolor 0.9white ;
> draw p withcolor black
> withpen pencircle scaled \MPvar{linewidth};
> endfor;
> \stopuseMPgraphic
>
> \definetextbackground[ExampleBackground]
>        
> [mp 
> = 
> mpos:par:myexample 
> ,location=paragraph,leftoffset=1em,rightoffset=1em,rulethickness=1pt]
>
> \starttext
> \input knuth \endgraf
> \starttextbackground[ExampleBackground]
> \dorecurse{13}{\input knuth \endgraf}
> \stoptextbackground
> \input knuth \endgraf
> \stoptext
>
>
> But now I need to make this box have rounded corners, and I am very  
> confused when reading core-pgr.tex because that is a level of MP  
> code I just don't understand.
>
> Would somebody please be able to tell me what to change in the above  
> to make the corners of the box rounded (with a radius of 2mm)?

The smoothed function is explained in the MetaFun manual.

Wolfgang

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