[R] Graphics output device
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Oct 6 14:30:52 CEST 1999
> Date: Wed, 06 Oct 1999 19:58:49 +0800
> From: Li Dongfeng <mavip5 at inet.polyu.edu.hk>
> I use two steps to make PNG graphics from R code for
> dynamic web publishing:
> 1) Generate postscript file with R code,
> but use a patched R. I patched the R source
> (src/unix/devPS.c) to add a new paper size which
> is smaller(595x421) and is in landscape orientation
Surely all saved graphs should be portrait?: landscape implies
a 90% rotation.
> 2) Convert the postscript file to PNG format
> using ghostscript:
> gs -dQUIET -dBATCH -dNOPAUSE \
> -dDEVICEWIDTH=595 -dDEVICEHEIGHT=421 \
> -sDEVICE=png256 -sOutputFile=filename.png psfile.ps
> This solution requires newer version browsers because PNG
> format is not supported in old browsers,
> but only need R and ghostscript, no other tools needed.
There is a more general solution along these lines in the function
dev2bitmap in 0.65.1, which is due for release in a few hours time. In
particular, it allows other output sizes, resolutions and formats.
paper="special" in postscript() makes the paper size equal to the
device region, in that version.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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