add angle attribute to plot_grid function

[rafapereirabr]

It would be super helpful if the attribute angle were added to the plot_grid function, so the user can set the angle of the label.

[billdenney]

As a generalization of this, is it possible to provide an element_text that defines the label formatting?

[clauswilke]

I’m happy to consider a pull request that does this in a reasonably clean and straightforward way, without breaking existing code.

Note that the upcoming ggplot2 2.3.0 will have native support for labels and those can be styled via element_text as usual.

[billdenney]

If it's coming soon, I don't feel a strong need for it sooner. (I don't know about @rafapereirabr.)

[rafapereirabr]

Thanks for the heads up @clauswilke . I agree with @billdenney . Let's wait for the ggplot2 2.3.0 update and see if it will solve the issue.

[clauswilke]

library(ggplot2)
ggplot(iris, aes(Sepal.Length, Sepal.Width, color = Species)) +
  geom_point() +
  labs(tag = "A") +
  theme(plot.tag = element_text(angle = 45))

Created on 2018-06-20 by the reprex package (v0.2.0).

[rafapereirabr]

Thanks, @clauswilke . That's very helpful.