See

library(grid)

?grid.cap

and this page for background:
http://developer.r-project.org/Raster/raster-RFC.html



On Thu, May 19, 2011 at 2:19 PM, Beutel, Terry S <
Terry.Beutel@deedi.qld.gov.au> wrote:

> I'm wondering if anyone is aware of a way to take what is visible in the
> R graphics window, pixelate it, and express that pixellation in a
> numeric matrix. For example, I am using the following command to create
> a  black (present) and white (absent) spatial simulation of grass
> tussock distribution.
>
> >
> symbols(x=runif(100,-.5,1.5),y=runif(100,-.5,1.5),circles=runif(100)/30,
> inches=F,bg=1,xlim=c(0,1),ylim=c(0,1))
>
> What I would like to end up with is a 2 dimensional matrix that
> indicates presence/absence of grass in any given pixel as per the image
> generated from the above graphics plot.
>
> Thanks
>
> Terry Beutel
>
>
>
>
> ********************************DISCLAIMER**************...{{dropped:15}}
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Michael Sumner
Institute for Marine and Antarctic Studies, University of Tasmania
Hobart, Australia
e-mail: mdsumner@gmail.com

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