Is there a way to remove the border of the legend in ggplot2?

Question

I'm using qplot to plot a function and I want to position the legend within the plot. I've used

opts( legend.position = c(0.7,0.7) )

to move the legend where I want it to be.

However there is a white border around the legend and that shows up on the gray background.

For example:

library(ggplot2)
x = c(1:20)
y = c(1:20)

p <- qplot(x,y, color = "blue")

p <- p + scale_colour_identity("Example", breaks=c("blue"), labels=c("dots"))

p <- p + opts(legend.position = c(0.6, 0.4))

print(p)

I would like to know how to remove this border from the legend. Thank you.

Answer 1

For newer version of ggplot, opts is replaced by theme & theme_rect is replaced by element_rect

p + theme(legend.background = element_rect(color = NA))

---

This will get rid of your border:

p + opts(legend.background = theme_rect(col = 0))

other options in addition to col (which applies to the border) are fill (background) and size (which is the border size).

Hope that helps!

All the best,

Jay