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::hue_pal()).
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
NULL to use the default scale values
A character vector that defines possible values of the scale and their
A function that accepts the existing (automatic) values and returns
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.
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.
If na.translate = TRUE, what aesthetic value should the
missing values be displayed as? Does not apply to position scales
where NA is always placed at the far right.
The names of the aesthetics that this scale works with.
The name of the scale that should be used for error messages
associated with this scale.
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
NULL for no labels
waiver() for the default labels computed by the
A character vector giving labels (must be same length as breaks)
A function that takes the breaks as input and returns labels