ggplot2: How to display data points in a circular 360 degree bar chart with an angle of 0 degrees?

username

I got a circular 360 degree bar chart where the angle (numeric x-axis) of each bar needs to be specified manually. In general the plot works fine except for data points where the angles are 0 respectively. 360 degrees. This line is removed and not drawn, not even with a bar width of 1.

Why did you do this? How can I draw a bar with a center value of 0 and a bar width of 20 (from -10 to 350 degrees to 10 degrees)?

Thanks!

MWE：

library(tidyverse)

# dummy data
data <- data.frame(
  variable = c(0, 90, 180, 270), 
  value = c(50, 100, 150, 200))

# plot
ggplot(data, aes(x = variable, y = value, fill = factor(variable))) +
  geom_col(width = 20)  + # Even with a widh of 1 the first datapoint is removed from the plot.
  scale_x_continuous(breaks = seq(from=0, to=359, by=10),  limits=c(0, 360)) +
  coord_polar(start = 0)
Alan Cameron

I don't see a simple general solution for drawing a bar that spans the wrapping points in polar coordinates, but it's easy to move the bounds and starting point to get the desired effect:

ggplot(data, aes(x = variable, y = value, fill = factor(variable))) +
  geom_col(width = 20)  + 
  scale_x_continuous(breaks = seq(0, 359, by = 10), limits = c(-10, 350)) +
  coord_polar(start = -pi/18, clip = "off")

enter image description here

Obviously if you try to draw the bars between 350 and 359 degrees instead of 0 and 9 degrees this will cause problems now, but assuming you don't want any of the bars to overlap, I guess that's not a problem.

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