Keep colors of unhighlighted

[Jonathan Zadra]

Is there any way to keep all the colors of the unhighlighted data? I'd like to just reduce their alpha while keeping the colors. I've tried (given that the original aes for color was my_color_var:
unhighlighted_params = list(alpha = .5, color = aes(my_color_var))
and
unhighlighted_params = list(alpha = .5, color = my_color_var)

[Hiroaki Yutani]

Thanks, I'll consider if gghighlight can support unhighlighted_params = list(colour = NULL) as an intent NOT to unhighlight colour aes...

[Guo Lei]

I strongly agree. It is a very useful function to keep the original colors of unhighlighted data, and this would make gghighlight a more powerful tool.

[Hiroaki Yutani]

Now this is possible. Thanks for your suggestion!

set.seed(2)
d <- purrr::map_dfr(
  letters,
  ~ data.frame(
    idx = 1:400,
    value = cumsum(runif(400, -1, 1)),
    type = .,
    flag = sample(c(TRUE, FALSE), size = 400, replace = TRUE),
    stringsAsFactors = FALSE
  )
)

# Preserve the colour and modify alpha instead
ggplot(d) +
  geom_line(aes(idx, value, colour = type)) +
  gghighlight(max(value) > 19,
              unhighlighted_params = list(colour = NULL, alpha = 0.3))
#> label_key: type