Annotate a Polar Plot with Axis Labels

This is a wrapper around ggplot2::annotate() which draws the y-axis labels directly on the plot, and optionally drops the labels at the side. Note that, owing to the way ggplot2::geom_col() interacts with ggplot2::coord_polar(), the .rose_angle argument should be used with rose_pollution() and rose_wind().

Usage

annotate_polar_axis(
  breaks,
  direction = "NW",
  labels = breaks,
  drop = TRUE,
  ...,
  .rose_angle = NULL
)

breaks: The axis breaks to label on the plot. It may be appropriate to use seq() to obtain equally spaced labels.
direction: The angles at which to write the labels. Can be expressed numerically, or using cardinal direction abbreviations ("N", "NNE", "NE", "ENE", etc.).
labels: The labels to use for each value of breaks. Defaults to breaks.
drop: Remove the y-axis labels to the side of the plot? Defaults to TRUE. Note that this option is overriden by complete themes such as ggplot2::theme_minimal() or theme_polar().
...: Arguments to pass to ggplot2::annotate().
.rose_angle: The number passed to the angle argument of rose_pollution()/rose_wind(). This is required to adjust wd when it is near to North/0 due to the way ggplot2::geom_col() interacts with ggplot2::coord_polar().

An annotation to be added to ggplot2::ggplot().

if (FALSE) {
polar_plot(mydata, "nox") + annotate_polar_axis(seq(5, 25, 5))
}