These functions allow you to specify your own set of mappings from levels in the data to aesthetic values.

scale_fill_hcl(..., palette = "RdYlBu", reverse = FALSE)



Arguments passed on to ggplot2::discrete_scale


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 omitted.


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.


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)

  • A function that takes the breaks as input and returns labels as output. Also accepts rlang lambda function notation.


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.


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.


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.


A function used to create a guide or its name. See guides() for more information.


The super class to use for the constructed scale


the name of the palette to generate colors from. A list of all available palettes can be found by running colorspace::hcl_palettes() (default is "RdYlBu").


If TRUE, the order of the colors is reversed (default is FALSE)'


Scale layer for the fill aesthetic.


The functions `scale_colour_manual()`, `scale_fill_manual()`, `scale_size_manual()`, etc. work on the aesthetics specified in the scale name: `colour`, `fill`, `size`, etc. However, the functions `scale_colour_manual()` and `scale_fill_manual()` also have an optional `aesthetics` argument that can be used to define both `colour` and `fill` aesthetic mappings via a single function call (see examples). The function `scale_discrete_manual()` is a generic scale that can work with any aesthetic or set of aesthetics provided via the `aesthetics` argument.