man-roxygen/geom-aesthetics.r

In corybrunson/ggalluvial: Alluvial Plots in 'ggplot2'

#' @section Aesthetics:
#' `geom_alluvium`, `geom_flow`, `geom_lode`, and `geom_stratum` understand the
#' following aesthetics (required aesthetics are in bold):
#'
#' - **`x`**
#' - **`y`**
#' - **`ymin`**
#' - **`ymax`**
#' - `alpha`
#' - `colour`
#' - `fill`
#' - `linetype`
#' - `size`
#' - `group`
#'
#' `group` is used internally; arguments are ignored.
#' 
#' Alluvium, flow, and lode geoms default to `alpha = 0.5`. Learn more about
#' setting these aesthetics in `vignette("ggplot2-specs", package = "ggplot2")`.
#'