Hi
Is this the same as "Bug 15462" ?
https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=15462
Paul
On 10/22/13 10:43, Yihui Xie wrote:
Hi,
It seems that anti-aliasing in png(type = 'cairo') is not well
supported for the point symbols without boarders, e.g. pch = 16. The
Cairo package works well, though. You can compare png() with
CairoPNG():
png(): http://i.imgur.com/8niB3jX.png
CairoPNG(): http://i.imgur.com/FZBJOxm.png
f = function(dev, ..., main = '') {
dev(...)
plot(c(1, 2, 1, 2), c(1, 1, 2, 2), pch=c(16, 19), cex=c(2, 2, 15, 15),
xlim=c(0.5, 2.5), ylim=c(0.5, 3), main = deparse(substitute(dev)))
dev.off()
}
f(grDevices::png, 'png-base.png', type = 'cairo')
f(Cairo::CairoPNG, 'png-Cairo.png')
If I remove the border for pch=19 (i.e. lwd=0), the point shows rough
edges as well.
I'm not sure if that is expected, or it is due to my misconfiguration
somewhere. I installed R via `apt-get install r-base-dev` under Ubuntu
using the CRAN repository.
sessionInfo()
R version 3.0.2 (2013-09-25)
Platform: x86_64-pc-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] Cairo_1.5-2 tools_3.0.2
capabilities()
jpeg png tiff tcltk X11 aqua http/ftp sockets
TRUE TRUE TRUE TRUE TRUE FALSE TRUE TRUE
libxml fifo cledit iconv NLS profmem cairo
TRUE TRUE TRUE TRUE TRUE TRUE TRUE
Regards,
Yihui
--
Yihui Xie <xieyi...@gmail.com>
Web: http://yihui.name
Department of Statistics, Iowa State University
2215 Snedecor Hall, Ames, IA
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--
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
p...@stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/
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