Change colours of violins

[NicoBia90]

Is there a way to make the dots and lines to be presented in black and the violins to be coloured?

I've tried this code:
ggplot(mpg, aes(x = class, y = cty)) + geom_pirate(aes(colour = class),bars = FALSE, violins_params = list(fill = class, size = 0.5, alpha = 0, width = 0.7))

But I get the following error:
_

Error in rep(value[[k]], length.out = n) :
attempt to replicate an object of type 'builtin'

_

[Mika Braginsky]

There's no way for the violins to be coloured, sorry. The list passed to violins_params is only static parameters, not aesthetics. I would recommend calling geom_pirate() with violins = FALSE and then adding your own geom_violin().