Controlling graticule appearance with geom_sf

[GillesSanMartin]

The control of the appearance (color, linewidth, linetype...) of the graticule produced with geom_sf is quite counter-intuitive and something seems to be wrong.

For the examples below I used the latest ggplot2 version from github reinstalled today (2.2.1.9000) and sf 0.5-4 (with R version 3.4.3 - Ubuntu 16.04.3 LTS).
This issue was initially posted on the sf github repository

I expected to be able to control for example the color and linetype of the graticule with panel.grid but these commands seem to be ignored

library(ggplot)
library(sf)
nc = st_read(system.file("gpkg/nc.gpkg", package = "sf")) 

ggplot() + 
    geom_sf(data = nc) + 
    theme(panel.grid = element_line(color = "red", linetype = 2))

It works as expected with panel.grid.major (but I would expect that panel.grid.major will inherit from panel.grid)

ggplot() + 
    geom_sf(data = nc) + 
    theme(panel.grid.major = element_line(color = "red", linetype = 2))

If you want to change only -say- the x grid color with panel.grid.major.x both x and y are changed :

ggplot() + 
    geom_sf(data = nc) + 
    theme(panel.grid.major.x = element_line(color = "red", linetype = 2))

If you want to change both x and y in different ways nothing happens :

ggplot() + 
    geom_sf(data = nc) + 
    theme(panel.grid.major.x = element_line(color = "red", linetype = 2),
          panel.grid.major.y = element_line(color = "blue", linetype = 3))

Each example works as intended when I use another geom :

d <- data.frame(x = rnorm(10), y = rnorm(10))
p <- ggplot(d, aes(x,y)) + geom_point()
p + theme(panel.grid = element_line(color = "red",  linetype = 2))
p + theme(panel.grid.major = element_line(color = "red",  linetype = 2))
p + theme(panel.grid.major.x = element_line(color = "red",  linetype = 2))
p + theme(panel.grid.major.x = element_line(color = "red", linetype = 2),
          panel.grid.major.y = element_line(color = "blue", linetype = 3))

By the way, if I'm not wrong, a few weeks ago (30 november) the default color of the graticule was also much lighter and less conspicuous (better to my taste)

[cpsievert]

Looks like this regression was introduced in caca650.

There's a chance that it has other unintended consequences due to the fact that ggplot2:::plot_theme(qplot(1:10))$panel.grid.major is now NULL

[hadley]

Thanks - I must be accessing directly rather than using the theme inheritance system.

[lock]

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