Question

I am using ggplot2 to chart bunch of items in one chart. Sincere there could be 1 to 60 or greater items, Iam using

ggplot(df, aes(Date, Value, colour=item, group=item)) + geom_point(size=0.4)    + guides(col = guide_legend(nrow = 30, byrow=TRUE))

to make sure I have 30 rows. If it is greater than 30 items, next legend item shows ups on the second column and so forth.

But If I have fewer items like 2 or 3, legends are overthrown from the chart window.

Is there an option to force the legend to justify vertically with ggplot?

Answer 1

+ opts(legend.justification=c(0,0.8)) 

did it for me. Since version 0.9.2, opts has been replaced by theme:

+ theme(legend.justification = c(0,0.8))