get list of colors used in a ggplot2 plot? [duplicate]

Answer 1

For a discrete scale (with default setting scale_colour_hue) the function hue_pal in package scales is used. E.g., with three factor levels:

R> library(scales)
R> scales::hue_pal()(3)
[1] "#F8766D" "#00BA38" "#619CFF"