Suppose I have data like the following:
lab <- "A really really long string!"
dat <- data.frame(grp = paste(1:6,lab),x=1:6,y=runif(6))
When plotting a legend with strings this long, sometimes it can be a challenge to get the legend to fit nicely. If I have to I can always abbreviate the strings to shorten them, but I was wondering if it's possible (most likely using some grid magic) to 'wrap' a legend across multiple rows or columns. For instance, say I position the legend on the bottom, horizontally:
ggplot(dat,aes(x=x,y=y,colour=grp)) + geom_point() +
opts(legend.position="bottom",legend.direction="horizontal")
Is it possible to get this legend to display as two rows of three, rather than one row of six?