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Create a Continuous Color Function from a Palette

Source: R/generate_colors.R
continuous_colors.Rd

Wraps generate_colors into a function that accepts a value between 0 and 1 and returns the corresponding color. Useful for mapping continuous variables to colors.

Usage

continuous_colors(palette = "viridis", n = 256, ...)

Arguments

palette

Passed directly to generate_colors(). Either a palette name string or a function.

n

integer. Resolution of the underlying color ramp — higher values give smoother gradients. Defaults to 256.

...

Additional arguments passed to generate_colors().

Value

A function that takes a numeric vector of values in [0, 1] and returns a character vector of hex colors.

See also

generate_colors()

Examples

pal <- continuous_colors("viridis")
pal(0)    # first color
#> [1] "#440154"
pal(1)    # last color
#> [1] "#FDE725"
pal(0.5)  # midpoint
#> [1] "#21908C"

# Map a continuous variable to colors
values <- seq(0, 1, length.out = 10)
pal(values)
#>  [1] "#440154" "#482878" "#3E4989" "#31688E" "#25828E" "#1E9D89" "#35B779"
#>  [8] "#6CCD59" "#B4DD2B" "#FDE725"

# Works with any palette generate_colors() accepts
pal <- continuous_colors("plasma", direction = -1)
pal <- continuous_colors(\(n) hcl.colors(n, palette = "Blue-Red"))