scale_colour_grey( ..., start = 0.2, end = 0.8, na.value = "red", aesthetics = "colour" ) scale_fill_grey( ..., start = 0.2, end = 0.8, na.value = "red", aesthetics = "fill" )
Arguments passed on to
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.,
NULLto 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.
Should unused factor levels be omitted from the scale? The default,
TRUE, uses the levels that appear in the data;
FALSEuses all the levels in the factor.
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.
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.
NULLfor no labels
waiver()for the default labels computed by the transformation object
A character vector giving labels (must be same length as
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.
A function used to create a guide or its name. See
guides()for more information.
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
expandargument. 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.
For position scales, The position of the axis.
rightfor y axes,
bottomfor x axes.
callused to construct the scale for reporting messages.
The super class to use for the constructed scale
grey value at low end of palette
grey value at high end of palette
Colour to use for missing values
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
fillaesthetics at the same time, via
aesthetics = c("colour", "fill").
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")