Radar coordinate system — coord

Add a radar coordinate system useful for radar charts.

Usage

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("poorman") && require("ggplot2")) {
  data <- iris[-5] %>%
    aggregate(list(Species = iris$Species), mean) %>%
    datawizard::reshape_longer(2:5)

  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: poorman
#> 
#>   I'd seen my father. He was a poor man, and I watched him do astonishing things.
#>     - Sidney Poitier
#> 
#> Attaching package: ‘poorman’
#> The following objects are masked from ‘package:stats’:
#> 
#>     filter, lag
#> Loading required package: ggplot2