Hi Paul,
You might want to try the gray colour scale - scale_fill_grey()
Unfortunately grid (the underlying graphics library that ggplot2 uses)
does not currently support patterns.
Hadley
On Wed, Nov 4, 2009 at 4:17 AM, Paul Chatfield p.s.chatfi...@rdg.ac.uk wrote:
Am trying to produce a graph which prints out well in black and white using
ggplot2. I have the following example set up nicely, but want to shade the
red bars in one pattern and the blue in another so they print out clearly.
I tried changing colours to 1 light, 1 dark, but then the overlapping colour
looks virtually identical to the darker one. I noted the option density in
barplot, but couldn't get this to work in ggplot. I could just replot this
as density plots using kernel smoothing, but quite like this format for the
data I have. Any help much appreciated.
library(ggplot2)
xy-data.frame(x=c(rnorm(1000), rnorm(1000,2,1)), grp=as.factor(rep(1:2,
each=1000)))
ggplot(xy, aes(x=x, fill=grp, group=grp)) +
geom_histogram(binwidth=0.5,colour=black,position = identity, alpha =
0.5) +
scale_fill_manual(values = c(red, blue))
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