[Rd] "Too many raster images" in devPS.c

[Wolfgang Huber]

Hi Paul

from a user perspective, this sounds reasonable.

         Thank you very much, 
               Wolfgang


Il giorno Jan 28, 2010, alle ore 2:44 AM, Paul Murrell ha scritto:

Wolfgang Huber wrote:
> Hi,
> I am finding the recently added [1] functionality of embedding raster images into plots on R devices very useful! Thanks to Paul Murrell and others for providing that. I noted that in https://svn.r-project.org/R/trunk/src/library/grDevices/src/devPS.c
> a macro is defined: #define MAX_RASTERS 64, and consequently, I get
> Error in grid.Call.graphics("L_raster", x$raster, x$x, x$y, x$width, x$height,  :
>   Too many raster images
> even for relatively innocent graphics, such as extensions of [2] (which I made with Bioconductor's "splots" package). Besides that, I imagine that raster images could be useful as 'glyphs' in various types of plots.
> Besides the not so helpful option of patching that macro in my private copy of R, is there an intention to extend this functionality to accommodate for larger plots more generally?


A simple solution (given the current implementation) would be to allow the user to specify the max number of raster images when starting a PDF file, e.g., ...

pdf("plotwithlotsofimages.pdf", maxRaster=1024)

Would that suffice?

Paul


> [1] http://developer.r-project.org/Raster/raster-RFC.html
> [2] http://www.ebi.ac.uk/~huber/pub/Druggable_ratio_1_before.pdf
> Thank you and best wishes,
>      Wolfgang
> --
> Wolfgang Huber
> EMBL
> http://www.embl.de/research/units/genome_biology/huber/contact
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Dr Paul Murrell
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The University of Auckland
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