Position scales for discrete distributions — scale_discrete

These scales allow for discrete distributions to be passed to the x and y position by mapping distribution objects to discrete aesthetics. These scale can be used similarly to the scale_*_discrete functions. If you want to transform your scale, you should apply a transformation through the coord_* functions, as they are applied after the stat, so the existing ggplot infastructure can be used.

Usage

scale_x_discrete_distribution(
  name = waiver(),
  palette = seq_len,
  expand = waiver(),
  guide = waiver(),
  position = "bottom",
  sec.axis = waiver(),
  continuous.limits = NULL,
  drop = TRUE,
  ...
)

scale_y_discrete_distribution(
  name = waiver(),
  palette = seq_len,
  expand = waiver(),
  guide = waiver(),
  position = "left",
  sec.axis = waiver(),
  continuous.limits = NULL,
  drop = TRUE,
  ...
)

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.

palette

A palette function that when called with a single integer argument (the number of levels in the scale) returns the numerical values that they should take.

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.

guide

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

position

For position scales, The position of the axis. left or right for y axes, top or bottom for x axes.

sec.axis

dup_axis() is used to specify a secondary axis.

continuous.limits

One of:

NULL to use the default scale range
A numeric vector of length two providing a display range for the scale. Use NA to refer to the existing minimum or maximum.
A function that accepts the limits and returns a numeric vector of length two.

...

Arguments passed on to discrete_scale

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 includes the levels in the factor. Please note that to display every level in a legend, the layer should use show.legend = TRUE.

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.

na.value

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.

aesthetics

The names of the aesthetics that this scale works with.

minor_breaks

One of:

NULL for no minor breaks
waiver() for the default breaks (none for discrete, one minor break between each major break for continuous)
A numeric vector of positions
A function that given the limits returns a vector of minor breaks. Also accepts rlang lambda function notation. When the function has two arguments, it will be given the limits and major break positions.

labels

One of the options below. Please note that when labels is a vector, it is highly recommended to also set the breaks argument as a vector to protect against unintended mismatches.

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.

call

The call used to construct the scale for reporting messages.

super

The super class to use for the constructed scale

Examples

library(ggplot2)
# ggplot
ggplot(smaller_diamonds, aes(x = cut, y = clarity)) +
 geom_count(aes(size = after_stat(prop)))

# ggdibbler
ggplot(smaller_uncertain_diamonds, aes(x = cut, y = clarity)) + 
 geom_count_sample(aes(size = after_stat(prop)), times=10, alpha=0.1)