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% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/scale-grey.R, R/zxx.R
\name{scale_colour_grey}
\alias{scale_colour_grey}
\alias{scale_fill_grey}
\alias{scale_color_grey}
\title{Sequential grey colour scales}
\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{
\item{name}{The name of the scale. Used as the axis or legend title. If
\code{waiver()}, the default, the name of the scale is taken from the first
mapping used for that aesthetic. If \code{NULL}, the legend title will be
omitted.}
\item{...}{
Arguments passed on to \code{\link[=discrete_scale]{discrete_scale}}
\describe{
\item{\code{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., \code{\link[scales:pal_hue]{scales::pal_hue()}}).}
\item{\code{breaks}}{One of:
\itemize{
\item \code{NULL} for no breaks
\item \code{waiver()} for the default breaks (the scale limits)
\item A character vector of breaks
\item A function that takes the limits as input and returns breaks
as output. Also accepts rlang \link[rlang:as_function]{lambda} function
notation.
}}
\item{\code{limits}}{One of:
\itemize{
\item \code{NULL} to use the default scale values
\item A character vector that defines possible values of the scale and their
order
\item A function that accepts the existing (automatic) values and returns
new ones. Also accepts rlang \link[rlang:as_function]{lambda} function
notation.
}}
\item{\code{drop}}{Should unused factor levels be omitted from the scale?
The default, \code{TRUE}, uses the levels that appear in the data;
\code{FALSE} includes the levels in the factor. Please note that to display
every level in a legend, the layer should use \code{show.legend = TRUE}.}
\item{\code{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 \code{na.translate = FALSE}.}
\item{\code{labels}}{One of:
\itemize{
\item \code{NULL} for no labels
\item \code{waiver()} for the default labels computed by the
transformation object
\item A character vector giving labels (must be same length as \code{breaks})
\item An expression vector (must be the same length as breaks). See ?plotmath for details.
\item A function that takes the breaks as input and returns labels
as output. Also accepts rlang \link[rlang:as_function]{lambda} function
notation.
}}
\item{\code{guide}}{A function used to create a guide or its name. See
\code{\link[=guides]{guides()}} for more information.}
\item{\code{call}}{The \code{call} used to construct the scale for reporting messages.}
\item{\code{super}}{The super class to use for the constructed scale}
}}
\item{start}{grey value at low end of palette}
\item{end}{grey value at high end of palette}
\item{na.value}{Colour to use for missing values}
\item{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 \code{colour} and \code{fill} aesthetics at the
same time, via \code{aesthetics = c("colour", "fill")}.}
}
\description{
Based on \code{\link[=gray.colors]{gray.colors()}}. This is black and white equivalent
of \code{\link[=scale_colour_gradient]{scale_colour_gradient()}}.
}
\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")
}
\seealso{
The documentation on \link[=aes_colour_fill_alpha]{colour aesthetics}.
The \href{https://ggplot2-book.org/scales-colour#hue-and-grey-scales}{hue and grey scales section} of the online ggplot2 book.
Other colour scales:
\code{\link{scale_alpha}()},
\code{\link{scale_colour_brewer}()},
\code{\link{scale_colour_continuous}()},
\code{\link{scale_colour_gradient}()},
\code{\link{scale_colour_hue}()},
\code{\link{scale_colour_identity}()},
\code{\link{scale_colour_manual}()},
\code{\link{scale_colour_steps}()},
\code{\link{scale_colour_viridis_d}()}
}
\concept{colour scales}
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