How to change font size and colour directlabels in ggplot

Question

I have some trouble changing the format of my line labels (colour and size). Can somebody point me in the right direction?

colnames(dfm) = c("date", "portfolio", "return")
p1<- ggplot(dfm) +
  geom_line(aes(x = date, y = return, color = portfolio)) +
  geom_dl(aes(x = date, y = return, label = "portfolio"), method = "last.bumpup", size = 0.01, color = portfolio) +
  geom_hline(yintercept = 100, linetype = "dashed", color = "blue", size = 0.02) +
  theme_classic()
gt1 <- ggplotGrob(p1)
gt1$layout$clip[gt1$layout$name == "panel"] <- "off"
grid.draw(gt1)

Changing the size parameter does not seem to alter the size of the directlabels.

Answer 1

As mentioned here, formatting options go inside of a list given to the method argument.