viridis | R Documentation |
This function creates a vector of n
equally spaced colors
along the selected color map.
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)
n |
The number of colors ( |
alpha |
The alpha transparency, a number in [0,1], see argument alpha in
|
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:
|
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
.
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.
Simon Garnier: garnier@njit.edu / @sjmgarnier
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"
)
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