scale_colour_grey {ggplot2} | R Documentation |
Sequential grey colour scales
Description
Based on gray.colors()
. This is black and white equivalent
of scale_colour_gradient()
.
Usage
scale_colour_grey(
name = waiver(),
...,
start = 0.2,
end = 0.8,
na.value = "red",
aesthetics = "colour"
)
scale_fill_grey(
name = waiver(),
...,
start = 0.2,
end = 0.8,
na.value = "red",
aesthetics = "fill"
)
Arguments
name |
The name of the scale. Used as the axis or legend title. If
waiver() , the default, the name of the scale is taken from the first
mapping used for that aesthetic. If NULL , the legend title will be
omitted.
|
... |
Arguments passed on to discrete_scale
palette A palette function that when called with a single integer
argument (the number of levels in the scale) returns the values that
they should take (e.g., scales::pal_hue() ).
breaks One of:
-
NULL for no breaks
-
waiver() for the default breaks (the scale limits)
A character vector of breaks
A function that takes the limits as input and returns breaks
as output. Also accepts rlang lambda function
notation.
limits One of:
-
NULL to use the default scale values
A character vector that defines possible values of the scale and their
order
A function that accepts the existing (automatic) values and returns
new ones. Also accepts rlang lambda function
notation.
drop Should unused factor levels be omitted from the scale?
The default, TRUE , uses the levels that appear in the data;
FALSE uses all the levels in the factor.
na.translate Unlike continuous scales, discrete scales can easily show
missing values, and do so by default. If you want to remove missing values
from a discrete scale, specify na.translate = FALSE .
scale_name The name of the scale
that should be used for error messages associated with this scale.
labels One of:
-
NULL for no labels
-
waiver() for the default labels computed by the
transformation object
A character vector giving labels (must be same length as breaks )
An expression vector (must be the same length as breaks). See ?plotmath for details.
A function that takes the breaks as input and returns labels
as output. Also accepts rlang lambda function
notation.
guide A function used to create a guide or its name. See
guides() for more information.
expand For position scales, a vector of range expansion constants used to add some
padding around the data to ensure that they are placed some distance
away from the axes. Use the convenience function expansion()
to generate the values for the expand argument. The defaults are to
expand the scale by 5% on each side for continuous variables, and by
0.6 units on each side for discrete variables.
position For position scales, The position of the axis.
left or right for y axes, top or bottom for x axes.
call The call used to construct the scale for reporting messages.
super The super class to use for the constructed scale
|
start |
grey value at low end of palette
|
end |
grey value at high end of palette
|
na.value |
Colour to use for missing values
|
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") .
|
See Also
The documentation on colour aesthetics.
Other colour scales:
scale_alpha()
,
scale_colour_brewer()
,
scale_colour_continuous()
,
scale_colour_gradient()
,
scale_colour_hue()
,
scale_colour_identity()
,
scale_colour_manual()
,
scale_colour_steps()
,
scale_colour_viridis_d()
Examples
p <- ggplot(mtcars, aes(mpg, wt)) + geom_point(aes(colour = factor(cyl)))
p + scale_colour_grey()
p + scale_colour_grey(end = 0)
# You may want to turn off the pale grey background with this scale
p + scale_colour_grey() + theme_bw()
# Colour of missing values is controlled with na.value:
miss <- factor(sample(c(NA, 1:5), nrow(mtcars), replace = TRUE))
ggplot(mtcars, aes(mpg, wt)) +
geom_point(aes(colour = miss)) +
scale_colour_grey()
ggplot(mtcars, aes(mpg, wt)) +
geom_point(aes(colour = miss)) +
scale_colour_grey(na.value = "green")
[Package
ggplot2 version 3.5.0
Index]