Continuous color scale specification — color

Creates a numeric color scale spec that is resolved during widget compilation. Use in color/fill_color aesthetics (e.g. fill_color = color_numeric(~x)).

Usage

color_numeric(
  expr,
  palette = NULL,
  domain = NULL,
  steps = 256L,
  na_color = "#00000000",
  reverse = FALSE,
  clamp = TRUE
)

Arguments

expr: A formula selecting a numeric column (e.g. ~value).
palette: NULL, a palette name (passed to grDevices::hcl.colors()), or a vector of colors.
domain: Optional numeric range c(min, max); defaults to data range.
steps: Number of palette steps for interpolation.
na_color: Color used for missing values.
reverse: Logical; reverse the palette.
clamp: Logical; if TRUE, clamp values outside domain to the ends.

Value

A color scale specification object.

Examples

if (requireNamespace("sf", quietly = TRUE)) {
  nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)
  maplamina(nc) |>
    add_polygons(fill_color = color_numeric(~BIR74))
}