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eliocamp avatar eliocamp commented on August 11, 2024

You can access those scales with p2$scales$scales[[1]] (or whatever number) but the issue is that ggnewscale renames the aes internally and the name depends on the number of scales so it's not super straightforward. However, for this example you can do

library(ggplot2)
library(ggnewscale)

topography <- expand.grid(x = 1:nrow(volcano),
                          y = 1:ncol(volcano))
topography$z <- c(volcano)
set.seed(42)
measurements <- data.frame(x = runif(30, 1, 80),
                           y = runif(30, 1, 60),
                           thing = rnorm(30))

p2 = ggplot(mapping = aes(x, y)) +
  geom_contour(data = topography, aes(z = z, color = stat(level))) +
  scale_color_viridis_c(option = "D") +
  new_scale_color() +
  geom_point(data = measurements, size = 3, aes(color = thing)) +
  scale_color_viridis_c(option = "A")


p2$scales$scales[[1]] <- scale_color_continuous(aesthetics = "colour_new", 
                                                guide = guide_colorbar(available_aes = "colour_new"))

p2
#> Warning: `stat(level)` was deprecated in ggplot2 3.4.0.
#> ℹ Please use `after_stat(level)` instead.
#> This warning is displayed once every 8 hours.
#> Call `lifecycle::last_lifecycle_warnings()` to see where this warning was
#> generated.

Created on 2023-04-10 with reprex v2.0.2

Notice that you need to rename both the aesthetics used by the scale and the available aesthetics used by the guide. If you add more scales, the name would be colour_new_new. However, this is relying on ggnewscale internals that are not guaranteed to work across releases.

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eliocamp avatar eliocamp commented on August 11, 2024

Sorry, I've just realised that you can get the names programmatically:

library(ggplot2)
library(ggnewscale)

topography <- expand.grid(x = 1:nrow(volcano),
                          y = 1:ncol(volcano))
topography$z <- c(volcano)
set.seed(42)
measurements <- data.frame(x = runif(30, 1, 80),
                           y = runif(30, 1, 60),
                           thing = rnorm(30))

p2 = ggplot(mapping = aes(x, y)) +
  geom_contour(data = topography, aes(z = z, color = stat(level))) +
  scale_color_viridis_c(option = "D") +
  new_scale_color() +
  geom_point(data = measurements, size = 3, aes(color = thing)) +
  scale_color_viridis_c(option = "A")


# Get the name of the aes and the guide
aes_name <- p2$scales$scales[[1]]$aesthetics
guide <- p2$scales$scales[[1]]$guide

guide$available_aes <- aes_name

p2$scales$scales[[1]] <- scale_color_continuous(aesthetics = aes_name, 
                                                guide = guide)

p2
#> Warning: `stat(level)` was deprecated in ggplot2 3.4.0.
#> ℹ Please use `after_stat(level)` instead.
#> This warning is displayed once every 8 hours.
#> Call `lifecycle::last_lifecycle_warnings()` to see where this warning was
#> generated.

Created on 2023-04-10 with reprex v2.0.2

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andrewGhazi avatar andrewGhazi commented on August 11, 2024

Perfect, thanks!

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