clipping a MetaPost graphic

clipping a MetaPost graphic

[Severin Obertuefer]

hi all

I made a MetaPost graphic and I want to use this graphic for a background.
The graphic is too large and I want to clip it to the size of 84mm width and
54mm height. With
"clip currentpicture to unitsquare xyscaled (86mm,54mm)"

I get the size I wanted but the clipped field should be placed in the center
of the currenpicture. I tried:

"clip currentpicture to unitsquare xyscaled (86mm,54mm) shifted center
boundingbox currentpicture"

but that became not the effect I wanted.How can I shift the clipping area to
the center of the currenpicture?

thx for help

severin

Re: clipping a MetaPost graphic

[Patrick Gundlach]

Hello Severin,

I don't know if my solution is clever or even working for you, but
since I did not find any answer, this hack might be better then
nothing:

path clippath;
clippath:= unitsquare xyscaled (8cm,8cm) ; % your size here
clip currentpicture to clippath shifted - .5urcorner(clippath);

I hope that the MP-experts shout out loud and show (me) a nicer
solution.

Patrick

Re: Re: clipping a MetaPost graphic

[Severin Obertuefer]

Hi Patrick

thx for help, but something with your solutin is wrong.
the clipped picture is to small after clipping.
But I found out something that does the thing I wantet, it looks like this:

path c; c:= unitsquare xyscaled (86mm,54mm) ;

clip currentpicture to c shifted (center currentpicture-center c);



thanks anyway :), greez severin



----- Original Message ----- 
From: "Patrick Gundlach" <pg@levana.de>
To: <ntg-context@ntg.nl>
Sent: Sunday, April 13, 2003 5:45 PM
Subject: [NTG-context] Re: clipping a MetaPost graphic


> Hello Severin,
> 
> I don't know if my solution is clever or even working for you, but
> since I did not find any answer, this hack might be better then
> nothing:
> 
> path clippath;
> clippath:= unitsquare xyscaled (8cm,8cm) ; % your size here
> clip currentpicture to clippath shifted - .5urcorner(clippath);
> 
> I hope that the MP-experts shout out loud and show (me) a nicer
> solution.
> 
> Patrick
> _______________________________________________
> ntg-context mailing list
> ntg-context@ntg.nl
> http://www.ntg.nl/mailman/listinfo/ntg-context
> 

Re: clipping a MetaPost graphic

[Hans Hagen]

At 19:48 12/04/2003 +0200, Severin Obertuefer wrote:
>hi all
>
>I made a MetaPost graphic and I want to use this graphic for a background.
>The graphic is too large and I want to clip it to the size of 84mm width and
>54mm height. With
>"clip currentpicture to unitsquare xyscaled (86mm,54mm)"

   xysized(...,...)

since xyscaled depend to much on the curren dimensions

>I get the size I wanted but the clipped field should be placed in the center
>of the currenpicture. I tried:
>
>"clip currentpicture to unitsquare xyscaled (86mm,54mm) shifted center
>boundingbox currentpicture"

   currentpicture := currentpicture shifted -center currentpicture ;

or

   currentpicture := currentpicture shifted - llcorner currentpicture ;

may help, depending on where your ref point is located

first shift, them clip to fullsquare (instead of unitsquare)

Hans
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