This geom behaves much like ggplot2::geom_col() but provides the option to set a corner radius to turn sharp-edged bars into rounded rectangles; it also sets some sane defaults for making chicklet charts.

  mapping = NULL,
  data = NULL,
  position = ggplot2::position_stack(reverse = TRUE),
  radius = grid::unit(3, "pt"),
  width = NULL,
  na.rm = FALSE,
  show.legend = NA,
  inherit.aes = TRUE




Set of aesthetic mappings created by aes() or aes_(). If specified and inherit.aes = TRUE (the default), it is combined with the default mapping at the top level of the plot. You must supply mapping if there is no plot mapping.


The data to be displayed in this layer. There are three options:

If NULL, the default, the data is inherited from the plot data as specified in the call to ggplot().

A data.frame, or other object, will override the plot data. All objects will be fortified to produce a data frame. See fortify() for which variables will be created.

A function will be called with a single argument, the plot data. The return value must be a data.frame, and will be used as the layer data. A function can be created from a formula (e.g. ~ head(.x, 10)).


Position adjustment, either as a string, or the result of a call to a position adjustment function.


corner radius (default 3pt)


Other arguments passed on to layer(). These are often aesthetics, used to set an aesthetic to a fixed value, like colour = "red" or size = 3. They may also be parameters to the paired geom/stat.


Bar width. By default, set to 90% of the resolution of the data.


If FALSE, the default, missing values are removed with a warning. If TRUE, missing values are silently removed.


logical. Should this layer be included in the legends? NA, the default, includes if any aesthetics are mapped. FALSE never includes, and TRUE always includes. It can also be a named logical vector to finely select the aesthetics to display.


If FALSE, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. borders().


An object of class GeomChicklet (inherits from GeomRrect, Geom, ggproto, gg) of length 7.


c("\nA sample of the output from geom_chicklet():", "\"Figure:\n")



the chicklet/segment stack positions are default set to be reversed (i.e. left-to-right/bottom-to-top == earliest to latest order).


geom_chicklet() understands the following aesthetics:

  • x

  • y

  • alpha

  • colour

  • fill

  • group

  • linetype

  • size

Use both fill and group when you want a fill colour per-segment but want to order the segments by another column (as in the Examples).




# set the speaker order
spkr_ordr <- aggregate(elapsed ~ speaker, data = debates2019, sum)
spkr_ordr <- spkr_ordr[order(spkr_ordr[["elapsed"]]),]

debates2019$speaker <- factor(debates2019$speaker, spkr_ordr$speaker)

ggplot(debates2019) +
  # use 'group' to control left-to-right order
  geom_chicklet(aes(speaker, elapsed, group = timestamp, fill = topic)) +
  scale_y_continuous(expand = c(0, 0.01), position = "right") +
  coord_flip() +
  labs(x = NULL, y = "Minutes Spoken", fill = NULL) +
  theme_minimal() +
  theme(panel.grid.major.y = element_blank()) +
  theme(legend.position = "bottom")
# }