r4ds/oreilly-colours.R

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2022-08-30 21:11:25 +08:00
library(farver)
library(dplyr, warn.conflicts = FALSE)
oreilly <- tribble(
~ name, ~r, ~g, ~b,
"blue", 0, 113, 188,
"orange", 247, 147, 30,
"red", 193, 39, 45,
"green", 0, 146, 68,
"yellow", 255, 222, 0,
"purple", 153, 0, 204
)
oreilly$col <- encode_colour(oreilly[c("r", "g", "b")])
tint <- function(col, tint) {
n <- length(tint)
col_Lab <- decode_colour(col, to = "Lab")
white_Lab <- decode_colour(white, to = "Lab")
encode_colour(
col_Lab[rep(1,n), ] * tint + white_Lab[rep(1,n), ] * (1 - tint),
from = "Lab"
)
}
tints <- seq(0.1, 1, length.out = 10)
oreilly |>
group_by(name) |>
summarise(
tint = paste0("t", tints * 100),
colour = tint(col, tints),
.groups = "drop"
) |>
tidyr::pivot_wider(names_from = tint, values_from = colour)
scales::show_col(tint(oreilly$col[5], tints))