Why is ggradar polygon fill colour different to polygon colour?

Question

I have a dataframe, sampdf, which looks like this:

name	cat1	cat2	cat3	cat4	cat5
Any Name	0.6198695	0.8864993	0.6239897	0.9735296	0.9735149

I wish to plot this as a (filled) polygon using ggradar.

Here's my code:

ggradar(sampdf, 
        group.colours = "slateblue4", 
        fill="TRUE", 
        group.point.size = 2, 
        font.radar = "NeueHaasDisplay-Roman", 
        axis.label.size = 6) +
  theme_void() +
  theme(legend.position = "none")

Here's the resulting chart:

Why is the fill colour red rather than slateblue4? Apologies if there is something simple I'm missing but this is driving me crazy!

Tried the code above, expecting the fill colour to be slateblue4, in fact it was red

Answer 1

Your code is almost correct, you just need to unquote TRUE in the fill argument e.g. :

sampdf <- tibble::tribble(
  ~name,    ~cat1,  ~cat2,  ~cat3,  ~cat4,  ~cat5,
  "Any Name",   0.6198695,  0.8864993,  0.6239897,  0.9735296,  0.9735149
)

ggradar(sampdf, 
        group.colours = "slateblue4", 
        fill=TRUE, 
        group.point.size = 2, 
        font.radar = "NeueHaasDisplay-Roman", 
        axis.label.size = 6) +
theme_void() +
theme(legend.position = "none")

which gives: