Accessible discrete color and fill scales — scale_a11y • a11yviz

Categorical palettes that meet WCAG 1.4.1 (Use of Color) by being distinguishable to viewers with color vision differences.

Usage

scale_color_a11y(palette = NULL, level = "AA", ...)

scale_fill_a11y(palette = NULL, level = "AA", ...)

Arguments

palette: One of "dark2_8" (default), "set2_8", "paired_12", "aaa_5". See a11y_palette_list().
level: WCAG contrast level. "AAA" switches the default palette to "aaa_5" (deep, AAA-on-white set). Ignored if palette is set explicitly.
...: Passed to ggplot2::discrete_scale.

Value

A ggplot2 scale.

Examples

if (requireNamespace("ggplot2",        quietly = TRUE) &&
    requireNamespace("palmerpenguins", quietly = TRUE)) {
  library(ggplot2)
  pg <- na.omit(palmerpenguins::penguins)
  ggplot(pg, aes(flipper_length_mm, body_mass_g, color = species)) +
    geom_point() + scale_color_a11y()
  ggplot(pg, aes(species, fill = island)) +
    geom_bar() + scale_fill_a11y("set2_8")
}