set some parameters to change the scale bar may be better

[zeqiandu]

it's a great work,but when I use this package to plot many pictures in one panel ,i want to change the legend's name "n_neighbors" to "density" . and different pictures in one panel will have different scale.i want to change the scale accoring point density to change bar scale.for example, ticks at different pictures in one panel will different

[jan-glx]

I have issues parsing your question but I think using current master (install with remotes::install_github("LKremer/ggpointdensity")) with aes(color=after_stat(ndensity)) will cover your needs:

library(ggplot2)

ggplot(iris[1:105,], aes(x = Sepal.Width, y = Sepal.Length)) +
  geom_point(data= function(dt) dt[, !(colnames(dt) %in% "Species")], aes(), color="gray", size=4) +
  ggpointdensity::geom_pointdensity(aes(color = after_stat(ndensity)), size=4) +
  scale_color_viridis_c(name = "scaled\ndensity") +
  facet_grid(rows = vars(Species)) +
  NULL  

^{Created on 2023-12-04 with reprex v2.0.2}