n distinct colors, never recycled. The first 18 are
dagviz.style.colors.palette()'s colors (6 hues at 3 lightness levels,
in dagviz's order, minus the 3 duplicates that its 7th hue step produces
by wrapping around to the 1st). Further colors are generated
deterministically in HCL space, each kept only if it is perceptibly
different from all earlier ones. metro_palette(k) is always the first
k colors of metro_palette(n) for k <= n. Colors get harder to tell
apart as n grows large (beyond roughly 100).
Examples
metro_palette(5)
#> [1] "#c65353" "#c6c653" "#53c653" "#53c6c6" "#5353c6"
# as a row of color swatches
swatches <- data.frame(x = 1:24, color = metro_palette(24))
ggplot2::ggplot(swatches, ggplot2::aes(x, 1, fill = I(color))) +
ggplot2::geom_tile() +
ggplot2::theme_void()
