Issue When Trying to Employ `guide_colourbar` ::::: v0.4.8

[g-pacheco]

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Hello @eliocamp,

Thanks a lot for the great tool.

I am running into a problem when I try to call guide_colourbar together with new_scale_fill(). I am not sure if the program is really designed to cover this possibility but it would be lovely if it were.

ggplot() +
 geom_raster(data = Salinity_df, aes(x = x, y = y, fill = Present.Surface.Salinity.Mean)) +
 scale_fill_gradient2(low = "#f0f0f0", mid = "#969696", high = "#252525", midpoint = 21, n.breaks = 5) +
 guides(fill = guide_colourbar(title = "Salinity", title.theme = element_text(size = 16, face = "bold"),
                               label.theme = element_text(size = 14, face = "bold"), label.position = "top",
                               barwidth = 10.7, barheight = 1, order = 1, frame.linetype = 1, frame.colour = "#000000",
                               ticks.colour = "#000000", direction = "horizontal")) +
 geom_sf(data = Global, fill = "#fff7f3", colour = "#000000") +
 new_scale_fill() +
 geom_star(data = Coors_Grouped, aes(x = Longitude, y = Latitude, starshape = Group, fill = BioState),
           colour = "#000000", size = 6)

Error in `guides_train()`:
! Guide 'colorbar' cannot be used for 'fill_new'.

May I ask if you would see any potential solution here?

Many thanks in advance, George.

[jan-glx]

I believe this will be fixed by #53 (can be used today by using remotes::install_github("teunbrand/ggnewscale", ref = "guide_fix")

[eliocamp]

Thanks. #53 is now merged. Please do confirm if this fixes the issue :)

[MartinBeal]

Still happens for me with v.0.4.9.

[eliocamp]

I don't know why I didn't see it, but I think the issue is that using guides() doesn't work with ggnewscale. You need to specify the guide in the guide argument of the scale.

This should work:

 scale_fill_gradient2(low = "#f0f0f0", mid = "#969696", high = "#252525", midpoint = 21, n.breaks = 5, 
                      guide = guide_colourbar(title = "Salinity", title.theme = element_text(size = 16, face = "bold"),
                                   label.theme = element_text(size = 14, face = "bold"), label.position = "top",
                                   barwidth = 10.7, barheight = 1, order = 1, frame.linetype = 1, frame.colour = "#000000",
                                   ticks.colour = "#000000", direction = "horizontal")))

If you're still having trouble, please send a minimal reproducible example so I can troubleshoot the issue.

[twest820]

Just hit this and can confirm the above workaround as moving guides(fill = guide_colorbar()) into scale_fill cleared the issue for me.