scale_colour_brewer: Sequential, diverging and qualitative colour scales from ColorBrewer

Description

The brewer scales provide sequential, diverging and qualitative colour schemes from ColorBrewer. These are particularly well suited to display discrete values on a map. See https://colorbrewer2.org for more information.

Usage

scale_colour_brewer(
  name = waiver(),
  ...,
  type = "seq",
  palette = 1,
  direction = 1,
  aesthetics = "colour"
)
scale_fill_brewer(
  name = waiver(),
  ...,
  type = "seq",
  palette = 1,
  direction = 1,
  aesthetics = "fill"
)
scale_colour_distiller(
  name = waiver(),
  ...,
  type = "seq",
  palette = 1,
  direction = -1,
  values = NULL,
  space = "Lab",
  na.value = "grey50",
  guide = "colourbar",
  aesthetics = "colour"
)
scale_fill_distiller(
  name = waiver(),
  ...,
  type = "seq",
  palette = 1,
  direction = -1,
  values = NULL,
  space = "Lab",
  na.value = "grey50",
  guide = "colourbar",
  aesthetics = "fill"
)
scale_colour_fermenter(
  name = waiver(),
  ...,
  type = "seq",
  palette = 1,
  direction = -1,
  na.value = "grey50",
  guide = "coloursteps",
  aesthetics = "colour"
)
scale_fill_fermenter(
  name = waiver(),
  ...,
  type = "seq",
  palette = 1,
  direction = -1,
  na.value = "grey50",
  guide = "coloursteps",
  aesthetics = "fill"
)

Arguments

name: The name of the scale. Used as the axis or legend title. If waiver(), the default, the name of the scale is taken from the first mapping used for that aesthetic. If NULL, the legend title will be omitted.
...: Other arguments passed on to discrete_scale(), continuous_scale(), or binned_scale(), for brewer, distiller, and fermenter variants respectively, to control name, limits, breaks, labels and so forth.
type: One of "seq" (sequential), "div" (diverging) or "qual" (qualitative)
palette: If a string, will use that named palette. If a number, will index into the list of palettes of appropriate type. The list of available palettes can found in the Palettes section.
direction: Sets the order of colours in the scale. If 1, the default, colours are as output by RColorBrewer::brewer.pal(). If -1, the order of colours is reversed.
aesthetics: Character string or vector of character strings listing the name(s) of the aesthetic(s) that this scale works with. This can be useful, for example, to apply colour settings to the colour and fill aesthetics at the same time, via aesthetics = c("colour", "fill").
values: if colours should not be evenly positioned along the gradient this vector gives the position (between 0 and 1) for each colour in the colours vector. See rescale() for a convenience function to map an arbitrary range to between 0 and 1.
space: colour space in which to calculate gradient. Must be "Lab" - other values are deprecated.
na.value: Colour to use for missing values
guide: Type of legend. Use "colourbar" for continuous colour bar, or "legend" for discrete colour legend.

Palettes

The following palettes are available for use with these scales:

Diverging: BrBG, PiYG, PRGn, PuOr, RdBu, RdGy, RdYlBu, RdYlGn, Spectral
Qualitative: Accent, Dark2, Paired, Pastel1, Pastel2, Set1, Set2, Set3
Sequential: Blues, BuGn, BuPu, GnBu, Greens, Greys, Oranges, OrRd, PuBu, PuBuGn, PuRd, Purples, RdPu, Reds, YlGn, YlGnBu, YlOrBr, YlOrRd

Modify the palette through the palette argument.

Details

The brewer scales were carefully designed and tested on discrete data. They were not designed to be extended to continuous data, but results often look good. Your mileage may vary.

Examples

Run this code

set.seed(596)
dsamp <- diamonds[sample(nrow(diamonds), 1000), ]
(d <- ggplot(dsamp, aes(carat, price)) +
  geom_point(aes(colour = clarity)))
d + scale_colour_brewer()

# Change scale label
d + scale_colour_brewer("Diamond\nclarity")

# Select brewer palette to use, see ?scales::pal_brewer for more details
d + scale_colour_brewer(palette = "Greens")
d + scale_colour_brewer(palette = "Set1")

# \donttest{
# scale_fill_brewer works just the same as
# scale_colour_brewer but for fill colours
p <- ggplot(diamonds, aes(x = price, fill = cut)) +
  geom_histogram(position = "dodge", binwidth = 1000)
p + scale_fill_brewer()
# the order of colour can be reversed
p + scale_fill_brewer(direction = -1)
# the brewer scales look better on a darker background
p +
  scale_fill_brewer(direction = -1) +
  theme_dark()
# }

# Use distiller variant with continuous data
v <- ggplot(faithfuld) +
  geom_tile(aes(waiting, eruptions, fill = density))
v
v + scale_fill_distiller()
v + scale_fill_distiller(palette = "Spectral")
# the order of colour can be reversed, but with scale_*_distiller(),
# the default direction = -1, so to reverse, use direction = 1.
v + scale_fill_distiller(palette = "Spectral", direction = 1)

# or use blender variants to discretise continuous data
v + scale_fill_fermenter()

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