Re: MPgraphic with rounded corners

Re: MPgraphic with rounded corners

[Duncan Hothersall]

Thank you to both Aditya and Wolfgang; I think I need to get a better 
grounding in the basic principles of MetaFun before trying to dabble 
again...

Duncan

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Re: MPgraphic with rounded corners

[Wolfgang Schuster]

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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Re: MPgraphic with rounded corners

[Aditya Mahajan]

On Thu, 15 Jan 2009, Duncan Hothersall wrote:

> 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;

Change this to

   p := multipars[1] topenlarged 8pt bottomenlarged 8pt cornered 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.

Look at the metafun manual. The path p is basically a box (whose 
dimentions are equal to the text on the page, but for metapost this is 
immaterial) and you wnat to make it have round corners. So you the 
appropriate metafun transformation (cornered in this case).

Aditya
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___________________________________________________________________________________

MPgraphic with rounded corners

[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;
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)?

Thank you very much!

Duncan

___________________________________________________________________________________
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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
___________________________________________________________________________________