Add multiple concentric circles to a ggplot object

This function creates a list of layers for concentric circles with specified radii that can be added to a ggplot object. The function takes optional arguments to customize the appearance of the circles.

Usage

add_multiple_circles(
  radii = c(0.25, 0.5, 0.75),
  circle_color = "grey20",
  circle_alpha = 1,
  circle_size = 0.5
)

Arguments

radii

A vector of radii for the concentric circles (default is c(0.25, 0.5, 0.75))

circle_color

The color of the circles (default is "grey40")

circle_alpha

The transparency of the circles (default is 1)

circle_size

The size of the circle lines (default is 1)

Value

A list of layers for concentric circles

Examples

library(ggplot2)
ggplot() + coord_fixed() + add_multiple_circles()