I read in a thread in r-help today that the windows device in 2.6 supports
transparency, so I tried an example and had some issues. The density plots
should be filled with transparent color in the following example (similar to
the points), however the color is "fully" transparent. This works in the
Cairo device, but not in the windows device.
Thanks,
--Matt
Matt Austin
Statistician, Amgen Inc.
Example of problem derived from example(layout) code.
##Start
windows()
x <- pmin(3, pmax(-3, rbeta(5000,1,5)))
y <- pmin(3, pmax(-3, c(rnorm(2500, .25, 1), rnorm(2500))) )
trtp.f <- factor(rep(c("Placebo", "Not Placebo"), each=2500),
levels=c("Placebo", "Not Placebo"))
xdens <- tapply(x, trtp.f, density, na.rm=TRUE)
ydens <- tapply(y, trtp.f, density, na.rm=TRUE)
topx <- max(unlist(lapply(xdens, function(x) max(x$y))))
topy <- max(unlist(lapply(ydens, function(x) max(x$y))))
xrange <- range(x, na.rm=TRUE)
yrange <- range(y, na.rm=TRUE)
nf <- layout(matrix(c(2,0,1,3),2,2,byrow=TRUE), c(3,1), c(1,3), TRUE)
par(mar=c(4,4,0,0), oma=c(0,0,0,0))
getcolors <- rainbow(length(levels(trtp.f)), alpha=.5)
plot(x, y, xlim=xrange, ylim=yrange,xlab="X value", ylab="Y value", pch=21,
bg=getcolors[as.numeric(trtp.f)])
par(mar=c(0,4,1,1))
plot(x=xrange, axes=FALSE, xlim=xrange, ylim=c(0, topx), xlab="", ylab="")
#lapply(xdens, lines)
for(i in 1:length(xdens)){
dat <- xdens[[i]]
polygon(x=c(min(dat$x), dat$x, max(dat$x)) , y=c(0, dat$y, 0), col=
rainbow(length(xdens), alpha=.5)[i])
}
par(mar=c(4,0,1,1))
plot(x=yrange, axes=FALSE, ylim=yrange, xlim=c(0, topy), xlab="", ylab="")
for(i in 1:length(ydens)){
dat <- ydens[[i]]
polygon(y=c(min(dat$x), dat$x, max(dat$x)) , x=c(0, dat$y, 0),
col=rainbow(length(ydens), alpha=.5)[i])
}
##End
Other Info:
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status RC
major 2
minor 6.0
year 2007
month 09
day 26
svn rev 42991
language R
version.string R version 2.6.0 RC (2007-09-26 r42991)
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