Resolve a color palette for plot groups — resolve

Maps groups to colors using selected colors or a default palette. Handles named color vectors by matching to group names, fills in missing colors with fallback values, and ensures the output vector is named and matches group length.

Usage

resolve_palette(groups, selected_colors = NULL, default_palette = NULL)

Arguments

groups: A character vector of group names to assign colors to.
selected_colors: A named or unnamed character vector of colors to use. If named, colors are matched to groups by name. If NULL or empty, uses default_palette.
default_palette: A character vector of fallback colors to use when selected_colors is NULL/empty or when groups have missing colors. Defaults to "#000000" (black) if not provided.

Value

A named character vector of colors with names corresponding to groups, or NULL if groups is empty.

Author

Jared Andrews

Examples

groups <- c("A", "B", "C")
colors <- c(A = "#FF0000", B = "#00FF00", C = "#0000FF")
resolve_palette(groups, colors)
#>         A         B         C 
#> "#FF0000" "#00FF00" "#0000FF" 
# Returns: c(A = "#FF0000", B = "#00FF00", C = "#0000FF")

# Using default palette
resolve_palette(groups, NULL, c("#1B9E77", "#D95F02", "#7570B3"))
#>         A         B         C 
#> "#1B9E77" "#D95F02" "#7570B3" 
# Returns: c(A = "#1B9E77", B = "#D95F02", C = "#7570B3")