Rotated axis labels are not properly aligned

[clauswilke]

In the following figure, the axis tick labels along the top x axis are not properly aligned. They all sit completely to the left of the axis tick rather than centered:

mtcars2 <- mtcars[1:15, ]
mtcars2$name <- row.names(mtcars2)
ggplot(mtcars2, aes(x = name, y = mpg, fill = name)) + 
  geom_bar(stat = 'identity', position = "identity") + 
  scale_y_reverse() +
  guides(fill = FALSE) +
  theme(axis.text.x = element_text(angle = 90, hjust=0)) +
  scale_x_discrete(position = "top")

No setting of vjust that I can add changes this, as far as I can tell. E.g., the following code creates the exact same output:

ggplot(mtcars2, aes(x = name, y = mpg, fill = name)) + 
  geom_bar(stat = 'identity', position = "identity") + 
  scale_y_reverse() +
  guides(fill = FALSE) +
  theme(axis.text.x = element_text(angle = 90, vjust=0.5, hjust=0)) +
  scale_x_discrete(position = "top")

As does any other vjust setting, including completely crazy ones such as -10 or 10.

[hadley]

Is this new in 2.2.0?

[clauswilke]

I think it's new to 2.2.0, because vjust=0.5 works fine if I keep the x axis at the bottom of the plot (and different vjust settings move the text left and right in this case):

ggplot(mtcars2, aes(x = name, y = mpg, fill = name)) + 
     geom_bar(stat = 'identity', position = "identity") + 
     scale_y_reverse() +
     guides(fill = FALSE) +
     theme(axis.text.x = element_text(angle = 90, vjust=0.5, hjust=1))

ggplot(mtcars2, aes(x = name, y = mpg, fill = name)) + 
     geom_bar(stat = 'identity', position = "identity") + 
     scale_y_reverse() +
     guides(fill = FALSE) +
     theme(axis.text.x = element_text(angle = 90, vjust=0, hjust=1))

[hadley]

Thanks, makes sense. This one's for you @thomasp85

[thomasp85]

This is not a bug per se, but rather an inconvenience fostered by a wish for both theme inheritance and nice defaults...

axis.text.x.top inherits from axis.text.x, but in order to look good by default it sets margin and just explicitly deferent from axis.text.x and these are thus not inherited when axis.text.x is set in a call to theme(). Setting it directly (theme(axis.text.x.top = element_text(vjust = 0.5))) solves your problem...

[clauswilke]

Perfect, thanks. Is this explained somewhere in the documentation?

[apuhegde]

That works for labels on the top. However, I'm facing this exact issue when I have labels on the bottom x-axis. Is there a solution to that? My R version is 3.4.3., RStudio 1.1.423
Thanks!

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