Hi,

Thanks a lot for creating ggbrick — geom_brick is a really cool visualization extension! However, I ran into an issue regarding the fill aesthetic.

Problem

When using a factor variable for fill, geom_brick fails with an error like:

Error in scale_fill_discrete():
! Continuous values supplied to discrete scale.
ℹ Example values: 5, 5, 5, 5, and 5

Even though I explicitly convert the column with factor(type), ggbrick still seems to treat it as continuous, or the scale detection does not work properly.

Minimal Reproducible Example

library(ggbrick)
library(ggplot2)

df <- data.frame(
  group = rep(c("A", "B"), each = 10),
  type = factor(rep(c("X", "Y"), each = 5, times = 2)),
  value = sample(1:100, 20)
)

ggplot(df, aes(x = group, y = value, fill = type)) +
  geom_brick(color = NA, size = 0.2)



Thanks again for the package and your time!

Best,