Package 'viridis'

Viridis Color Scales for ggplot2

Description

Scale functions (fill and colour/color) for ggplot2.

For discrete == FALSE (the default) all other arguments are as to scale_fill_gradientn or scale_color_gradientn. Otherwise the function will return a discrete_scale with the plot-computed number of colors.

See viridis and viridis.map for more information on the color palettes.

Usage

scale_fill_viridis(
  ...,
  alpha = 1,
  begin = 0,
  end = 1,
  direction = 1,
  discrete = FALSE,
  option = "D",
  aesthetics = "fill"
)

scale_color_viridis(
  ...,
  alpha = 1,
  begin = 0,
  end = 1,
  direction = 1,
  discrete = FALSE,
  option = "D",
  aesthetics = "color"
)

scale_colour_viridis(
  ...,
  alpha = 1,
  begin = 0,
  end = 1,
  direction = 1,
  discrete = FALSE,
  option = "D",
  aesthetics = "color"
)

Arguments

...	Parameters to discrete_scale if discrete == TRUE, or scale_fill_gradientn/ scale_color_gradientn if discrete == FALSE.
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 as output by viridis_pal. If -1, the order of colors is reversed.
discrete	Generate a discrete palette? (default: FALSE - generate continuous palette).
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")
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").

Author(s)

Noam Ross [email protected]

Bob Rudis [email protected]

Simon Garnier: [email protected]

Examples

library(ggplot2)

# Ripped from the pages of ggplot2
p <- ggplot(mtcars, aes(wt, mpg))
p + geom_point(size = 4, aes(colour = factor(cyl))) +
    scale_color_viridis(discrete = TRUE) +
    theme_bw()

# Ripped from the pages of ggplot2
dsub <- subset(diamonds, x > 5 & x < 6 & y > 5 & y < 6)
dsub$diff <- with(dsub, sqrt(abs(x - y)) * sign(x - y))
d <- ggplot(dsub, aes(x, y, colour = diff)) + geom_point()
d + scale_color_viridis() + theme_bw()


# From the main viridis example
dat <- data.frame(x = rnorm(10000), y = rnorm(10000))

ggplot(dat, aes(x = x, y = y)) +
  geom_hex() + coord_fixed() +
  scale_fill_viridis() + theme_bw()

library(ggplot2)
library(MASS)
library(gridExtra)

data("geyser", package="MASS")

ggplot(geyser, aes(x = duration, y = waiting)) +
  xlim(0.5, 6) + ylim(40, 110) +
  stat_density2d(aes(fill = ..level..), geom = "polygon") +
  theme_bw() +
  theme(panel.grid = element_blank()) -> gg

grid.arrange(
  gg + scale_fill_viridis(option = "A") + labs(x = "Viridis A", y = NULL),
  gg + scale_fill_viridis(option = "B") + labs(x = "Viridis B", y = NULL),
  gg + scale_fill_viridis(option = "C") + labs(x = "Viridis C", y = NULL),
  gg + scale_fill_viridis(option = "D") + labs(x = "Viridis D", y = NULL),
  gg + scale_fill_viridis(option = "E") + labs(x = "Viridis E", y = NULL),
  gg + scale_fill_viridis(option = "F") + labs(x = "Viridis F", y = NULL),
  gg + scale_fill_viridis(option = "G") + labs(x = "Viridis G", y = NULL),
  gg + scale_fill_viridis(option = "H") + labs(x = "Viridis H", y = NULL),
  ncol = 4, nrow = 2
)

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USA Unemployment in 2009

Description

A data set containing the 2009 unemployment data in the USA by county.

Usage

unemp

Format

A data frame with 3218 rows and 8 variables:

id

the county ID number

state_fips

the state FIPS number

county_fips

the county FIPS number

name

the county name

year

the year

rate

the unemployment rate

county

the county abbreviated name

state

the state acronym

Source

http://datasets.flowingdata.com/unemployment09.csv

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Viridis Color Palettes

Description

A wrapper function around viridis to turn it into a palette function compatible with discrete_scale.

Usage

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

Arguments

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

See viridis and viridis.map for more information on the color palettes.

Author(s)

Bob Rudis: [email protected]

Simon Garnier: [email protected]

Examples

library(scales)
show_col(viridis_pal()(12))

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