[SOLVED] Apply color brewer to a single line in ggplot

Apply color brewer to a single line in ggplot

library(tidyverse)
library(RColorBrewer)
mtcars %>% 
  count(cyl) %>% 
  ungroup() %>% 
  ggplot(aes(cyl, n)) + 
  geom_line(size = 3) + 
  scale_color_brewer(palette = "Accent")

I'll often have a whole series of graphs with the color theme for each being scale_color_brewer(palette = "Accent"). I want to maintain this theme throughout my .Rmd file, on all graphs. However, this scale_color_brewer() only works if there's multiple lines on each plot.

For the case above (a single line), how do I apply scale_color_brewer(palette = "Accent"), short of specifying the unique color as an argument in geom_line()? I'm hoping there's a better solution than that manual process. Using different themes and having to look up all the different CMYK values gets tedious.

Solution

You could always set a color aesthetic and just turn off the legend

mtcars %>% 
  count(cyl) %>% 
  ungroup() %>% 
  ggplot(aes(cyl, n, color="A")) + 
  geom_line(size = 3) + 
  scale_color_brewer(palette = "Accent", guide="none")