Color Mapping

Maps values to colors.

Usage

palette_color_picker(
  scheme,
  domain = NULL,
  midpoint = NULL,
  ordered = FALSE,
  missing = NULL,
  ...
)

palette_colour_picker(
  scheme,
  domain = NULL,
  midpoint = NULL,
  ordered = FALSE,
  missing = NULL,
  ...
)

Arguments

scheme

A character string giving the name of the scheme to be used (see color()).

domain

A numeric range or a vector of categorical data specifying the possible values that can be mapped.

midpoint

A length-one numeric vector specifying the mid-point of input range.

ordered

A logical scalar: should the levels be treated as already in the correct order?

missing

The color to return for NA values.

...

Further parameters to be passed to color().

Value

A palette function that when called with a single argument returns a character vector of colors.

Details

A wrapper around palette_color_continuous() and palette_color_discrete().

See also

Other palettes: palette_color_continuous(), palette_color_discrete(), palette_shape(), palette_size_range()

Examples

## Visualize a simple DEM model
## Distribution of elevation values
elevation <- hist(volcano)


## Where are breaks?
elevation$breaks
#>  [1]  90 100 110 120 130 140 150 160 170 180 190 200

## Build palette functions
ramp_BuRd <- palette_color_picker("BuRd")

(col <- ramp_BuRd(elevation$breaks))
#>  [1] "#2166AC" "#3986BC" "#66A9CF" "#9DCAE1" "#CBE2EE" "#E9F0F4" "#F9ECE5"
#>  [8] "#FCD6C0" "#F5AE8E" "#E37F65" "#CC4C43" "#B2182B"
image(volcano, col = col)
legend("topright", legend = elevation$breaks, fill = col)


## Rescale to midpoint
ramp_BuRd <- palette_color_picker("BuRd", midpoint = 160)

(col <- ramp_BuRd(elevation$breaks))
#>  [1] "#2166AC" "#347FB9" "#4E9AC6" "#7BB6D6" "#A3CEE3" "#C8E0ED" "#E1ECF3"
#>  [8] "#F7F7F7" "#FAE7DB" "#FBD3BD" "#F6B495" "#EB9172"
image(volcano, col = col)
legend("topright", legend = elevation$breaks, fill = col)