viridis {viridisLite}

Viridis Color Palettes

Description

This function creates a vector of n equally spaced colors along the selected color map.

Usage

viridis(n, alpha = 1, begin = 0, end = 1, direction = 1, option = "D")

viridisMap(n = 256, alpha = 1, begin = 0, end = 1, direction = 1, option = "D")

magma(n, alpha = 1, begin = 0, end = 1, direction = 1)

inferno(n, alpha = 1, begin = 0, end = 1, direction = 1)

plasma(n, alpha = 1, begin = 0, end = 1, direction = 1)

cividis(n, alpha = 1, begin = 0, end = 1, direction = 1)

rocket(n, alpha = 1, begin = 0, end = 1, direction = 1)

mako(n, alpha = 1, begin = 0, end = 1, direction = 1)

turbo(n, alpha = 1, begin = 0, end = 1, direction = 1)

Arguments

n

The number of colors (\ge 1) to be in the palette.

alpha

The alpha transparency, a number in [0,1], see argument alpha in hsv.

begin

The (corrected) hue in [0,1] at which the color map begins.

end

The (corrected) hue in [0,1] at which the color map ends.

direction

Sets the order of colors in the scale. If 1, the default, colors are ordered from darkest to lightest. If -1, the order of colors is reversed.

option

A character string indicating the color map option to use. Eight options are available:

• "magma" (or "A")

• "inferno" (or "B")

• "plasma" (or "C")

• "viridis" (or "D")

• "cividis" (or "E")

• "rocket" (or "F")

• "mako" (or "G")

• "turbo" (or "H")

Details

Here are the color scales:

magma(), plasma(), inferno(), cividis(), rocket(), mako(), and turbo() are convenience functions for the other color map options, which are useful when the scale must be passed as a function name.

Semi-transparent colors (0 < alpha < 1) are supported only on some devices: see rgb.

Value

viridis returns a character vector, cv, of color hex codes. This can be used either to create a user-defined color palette for subsequent graphics by palette(cv), a col = specification in graphics functions or in par.

viridisMap returns a n lines data frame containing the red (R), green (G), blue (B) and alpha (alpha) channels of n equally spaced colors along the selected color map. n = 256 by default.

Author(s)

Simon Garnier: [e-mail] / @sjmgarnier

Examples

library(ggplot2)
library(hexbin)

dat <- data.frame(x = rnorm(10000), y = rnorm(10000))

ggplot(dat, aes(x = x, y = y)) +
  geom_hex() + coord_fixed() +
  scale_fill_gradientn(colours = viridis(256, option = "D"))

# using code from RColorBrewer to demo the palette
n = 200
image(
  1:n, 1, as.matrix(1:n),
  col = viridis(n, option = "D"),
  xlab = "viridis n", ylab = "", xaxt = "n", yaxt = "n", bty = "n"
)