editing the legend on geom_text()

Question

i never have trouble editing the legend with ggplot, but with geom_text I seem to be having some trouble.

i <- ggplot(threedusg, aes(x=DxRAPM, y=X3PAr, label=threedusg$Player)) i + geom_text(aes(size=threedusg$CS3,hjust=0,vjust=0)) + scale_x_continuous(limits=c(0,6))

Here is what my legend looks http://imgur.com/H6vZN2b

The size of the text comes from data with percentages. I would prefer to have the text in the legend read as actual percentages. For instance it says .30 instead of 30%. Any help would be greatly appreciated!

Answer 1

Using the scales library (which you will need to explicitly load), you can use the percent labeller. (Note you shouldn't be referencing the columns of a data set using $ within a ggplot call.

library(scales)

ggplot(threedusg, aes(x = DxRAPM, y = X3PAr, label = Player)) +
  geom_text(aes(size = CS3), hjust = 0, vjust = 0) +
  scale_x_continuous(limits = c(0,6)) +
  scale_size(label = percent)

On a reproducible example

foo <- data.frame(x=1:5,y=1:5,player=letters[1:5],rate = c(0.2,0.5,0.7,0.1,0.8))
ggplot(foo, aes(x=x,y=y,label=player)) + 
  geom_text(aes(size=rate)) + 
  scale_size(label = percent)