The viridis
scales provide colour maps that are perceptually uniform in both
colour and black-and-white. They are also designed to be perceived by viewers
with common forms of colour blindness. See also
https://bids.github.io/colormap/.
scale_colour_viridis_d(..., alpha = 1, begin = 0, end = 1, direction = 1, option = "D", aesthetics = "colour") scale_fill_viridis_d(..., alpha = 1, begin = 0, end = 1, direction = 1, option = "D", aesthetics = "fill") scale_colour_viridis_c(..., alpha = 1, begin = 0, end = 1, direction = 1, option = "D", values = NULL, space = "Lab", na.value = "grey50", guide = "colourbar", aesthetics = "colour") scale_fill_viridis_c(..., alpha = 1, begin = 0, end = 1, direction = 1, option = "D", values = NULL, space = "Lab", na.value = "grey50", guide = "colourbar", aesthetics = "fill")
... | Other arguments passed on to |
---|---|
alpha | The alpha transparency, a number in [0,1], see argument alpha in
|
begin | The (corrected) hue in [0,1] at which the viridis colormap begins. |
end | The (corrected) hue in [0,1] at which the viridis colormap 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 colormap option to use. Four options are available: "magma" (or "A"), "inferno" (or "B"), "plasma" (or "C"), "viridis" (or "D", the default option) and "cividis" (or "E"). |
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 |
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
|
space | colour space in which to calculate gradient. Must be "Lab" - other values are deprecated. |
na.value | Missing values will be replaced with this value. |
guide | A function used to create a guide or its name. See
|
Other colour scales: scale_alpha
,
scale_colour_brewer
,
scale_colour_gradient
,
scale_colour_grey
,
scale_colour_hue
# viridis is the default colour/fill scale for ordered factors dsamp <- diamonds[sample(nrow(diamonds), 1000), ] ggplot(dsamp, aes(carat, price)) + geom_point(aes(colour = clarity))# Use viridis_d with discrete data txsamp <- subset(txhousing, city %in% c("Houston", "Fort Worth", "San Antonio", "Dallas", "Austin")) (d <- ggplot(data = txsamp, aes(x = sales, y = median)) + geom_point(aes(colour = city)))d + scale_colour_viridis_d()# Change scale label d + scale_colour_viridis_d("City\nCenter")# Select palette to use, see ?scales::viridis_pal for more details d + scale_colour_viridis_d(option = "plasma")d + scale_colour_viridis_d(option = "inferno")# scale_fill_viridis_d works just the same as # scale_colour_viridis_d but for fill colours p <- ggplot(txsamp, aes(x = median, fill = city)) + geom_histogram(position = "dodge", binwidth = 15000) p + scale_fill_viridis_d()# the order of colour can be reversed p + scale_fill_viridis_d(direction = -1)# Use viridis_c with continous data (v <- ggplot(faithfuld) + geom_tile(aes(waiting, eruptions, fill = density)))v + scale_fill_viridis_c()v + scale_fill_viridis_c(option = "plasma")