ggplot2: how to remove slash from geom_density legend

Question

I\'m trying to plot some overlapping density plots in ggplot2. I\'m running into a problem where I cannot remove the diagonal slash from the legend. I have tried using scale

Answer 1

Try this:

+ guides(fill = guide_legend(override.aes = list(colour = NULL)))

although that removes the black outline as well...which can be added back in by change the theme to:

legend.key = element_rect(colour = "black")

I completely forgot to add this important note: do not specify aesthetics via x=iris$Sepal.Length using the $ operator! That is not the intended way to use aes() and it will lead to errors and unexpected problems down the road.