Generate Color Palettes

Source: R/get_palette.R

Generate a palette of k colors from ggsci palettes, RColorbrewer palettes and custom color palettes. Useful to extend RColorBrewer and ggsci to support more colors.

get_palette(palette = "default", k)

Arguments

palette

Color palette. Allowed values include:

  • Grey color palettes: "grey" or "gray";

  • RColorBrewer palettes, see brewer.pal and details section. Examples of palette names include: "RdBu", "Blues", "Dark2", "Set2", ...;

  • Custom color palettes. For example, palette = c("#00AFBB", "#E7B800", "#FC4E07");

  • ggsci scientific journal palettes, e.g.: "npg", "aaas", "lancet", "jco", "ucscgb", "uchicago", "simpsons" and "rickandmorty".

k

the number of colors to generate.

Value

Returns a vector of color palettes.

Details

RColorBrewer palettes: To display all available color palettes, type this in R:RColorBrewer::display.brewer.all(). Color palette names include:

  • Sequential palettes, suited to ordered data that progress from low to high. Palette names include: Blues BuGn BuPu GnBu Greens Greys Oranges OrRd PuBu PuBuGn PuRd Purples RdPu Reds YlGn YlGnBu YlOrBr YlOrRd.

  • Diverging palettes:Gradient colors. Names include: BrBG PiYG PRGn PuOr RdBu RdGy RdYlBu RdYlGn Spectral.

  • Qualitative palettes: Best suited to representing nominal or categorical data. Names include: Accent, Dark2, Paired, Pastel1, Pastel2, Set1, Set2, Set3.

Examples

data("iris")
iris$Species2 <- factor(rep(c(1:10), each = 15))

# Generate a gradient of 10 colors
ggscatter(iris, x = "Sepal.Length", y = "Petal.Length",
 color = "Species2",
 palette = get_palette(c("#00AFBB", "#E7B800", "#FC4E07"), 10))


# Scatter plot with default color palette
ggscatter(iris, x = "Sepal.Length", y = "Petal.Length",
 color = "Species")


# RColorBrewer color palettes
ggscatter(iris, x = "Sepal.Length", y = "Petal.Length",
 color = "Species", palette = get_palette("Dark2", 3))


# ggsci color palettes
ggscatter(iris, x = "Sepal.Length", y = "Petal.Length",
 color = "Species", palette = get_palette("npg", 3))


# Custom color palette
ggscatter(iris, x = "Sepal.Length", y = "Petal.Length",
 color = "Species",
 palette = c("#00AFBB", "#E7B800", "#FC4E07"))


# Or use this
ggscatter(iris, x = "Sepal.Length", y = "Petal.Length",
 color = "Species",
 palette = get_palette(c("#00AFBB", "#FC4E07"), 3))