Distinguish theme (background) color for negative and positive values in geom_boxplot
Solution 1:
One option would be to add different filled backgrounds using geom_rect:
library(ggplot2)
ggplot(df,
aes(x = Q, y = slope, color = Recipient)) +
geom_rect(data = data.frame(
xmin = c(-Inf, -Inf),
xmax = c(Inf, Inf),
ymin = c(-Inf, 0),
ymax = c(0, Inf),
fill = c("darkblue", "lightblue")
), aes(xmin = xmin, xmax = xmax, ymin = ymin, ymax = ymax, fill = fill), inherit.aes = FALSE, alpha = .5) +
scale_fill_manual(values = c("darkblue" = "darkblue", "lightblue" = "lightblue"), guide = "none") +
geom_boxplot(notch = TRUE)
