Radar coordinate system — coord

Add a radar coordinate system useful for radar charts.

coord_radar(theta = "x", start = 0, direction = 1, ...)

Arguments

theta	variable to map angle to (`x` or `y`)
start	Offset of starting point from 12 o'clock in radians. Offset is applied clockwise or anticlockwise depending on value of `direction`.
direction	1, clockwise; -1, anticlockwise
...	Other arguments to be passed to `ggproto`.

Examples

# Create a radar/spider chart with ggplot:
if (require("dplyr") && require("tidyr") && require("ggplot2")) {
  data <- iris %>%
    group_by(Species) %>%
    summarise_all(mean) %>%
    pivot_longer(-Species)

  data %>%
    ggplot(aes(x = name, y = value, color = Species, group = Species)) +
    geom_polygon(fill = NA, size = 2) +
    coord_radar(start = -pi / 4)
}
#> Loading required package: dplyr
#> 
#> Attaching package: ‘dplyr’
#> The following objects are masked from ‘package:stats’:
#> 
#>     filter, lag
#> The following objects are masked from ‘package:base’:
#> 
#>     intersect, setdiff, setequal, union
#> Loading required package: tidyr
#> Loading required package: ggplot2