Draw a circular guide.

Creates a list of annotation layers that render a circle with the requested radius and appearance. The returned list can be added directly to a ggplot.

Usage

add_circ(
  radius = 1,
  circle_color = "grey60",
  circle_alpha = 1,
  circle_size = 1
)

Arguments

radius

Radius of the circle, expressed in the same units as the plot coordinates.

circle_color

Line colour for the circle.

circle_alpha

Alpha transparency for the circle.

circle_size

Line width for the circle.

Value

A list containing a single ggplot annotation layer.

Examples

library(ggplot2)
ggplot() +
  coord_fixed() +
  add_circ(radius = 1)