Boxplot, how to match outliers' color to fill aesthetics?

Question

I am trying to match boxplot\'s outliers color to the fill color which is set by aesthetic (scale_colour_discrete).

Here is an example.

m <- ggplo         


        

Answer 1

I found a way to do this, editing raw grid object.

library(ggplot2)

match.ol.col <- function(plt,aes.cp='fill') {
  # matches outliers' color to either fill or colour aesthetics
  #   plt: ggplot layer object having boxplot
  #   aes.cp: aetsthetic from which copy color.  must be either 'fill' or 'col'
  # returns grid objects, so print it wigh grid.draw(), not print()
  if (aes.cp %in% c('color', 'colour')) aes.cp <- 'col'
  grob <- ggplotGrob(plt)
  bps <- getGrob(grob, 'boxplots', grep=T)
  for (bp in bps$children) {
    p <- getGrob(bp, 'point', grep=T)
    if (is.null(p)) next
    r <- getGrob(bp, 'rect', grep=T)
    grob <- geditGrob(grob, p$name, gp=gpar(col=r$gp[[aes.cp]]))
  }
  return(grob)
}


m <- ggplot(movies, aes(y = votes, x = factor(round(rating)),
    colour=factor(Animation)))
p <- m + geom_boxplot() + scale_y_log10()

grob <- match.ol.col(p, aes.cp='colour')
grid.draw(grob)

results: