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Diverging palette

Source: R/a11y_palette_continuous.R
a11y_palette_div.Rd

Returns the low/mid/high anchor colors for a diverging gradient. Most palettes resolve at runtime from RColorBrewer. *_dual variants pick mid-saturation Brewer positions whose endpoints clear non-text 3:1 on both white and #1a1a1a dark backgrounds. coolwarm_aaa is a custom built-in whose endpoints both clear AAA on white only.

Usage

a11y_palette_div(name = "rdbu")

Arguments

name

One of "rdbu" (default), "puor", "brbg", "rdbu_dual", "puor_dual", "brbg_dual", "coolwarm_aaa".

Value

Named list with elements low, mid, high (hex codes for the diverging anchors). To materialize an N-step gradient, pass the list to a color interpolator (e.g., grDevices::colorRampPalette()).

Examples

a11y_palette_div("rdbu")
#> $low
#> [1] "#2166AC"
#> 
#> $mid
#> [1] "#F7F7F7"
#> 
#> $high
#> [1] "#B2182B"
#> 
a11y_palette_div("rdbu_dual")
#> $low
#> [1] "#4393C3"
#> 
#> $mid
#> [1] "#F7F7F7"
#> 
#> $high
#> [1] "#D6604D"
#>