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ggplot2 multiline title, different indentations

I am generating graphs for a publication and I'd like to be able to label the panels of a figure in ggplot itself (as opposed to exporting to publisher, etc) so that they just fit neatly together in the final document. I was going to try to do this by adding a letter ("A") into the title, but I'd like my titles centered and I'd like the letter in the upper lefthand corner.

# base graph:

ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, color = Species, shape = Species))+
  geom_jitter(size = 6.5)+
  ggtitle("A \n \n The Actual Long, Normal Title of Titliness")+
  theme(plot.title = element_text(hjust = 0.5, face = "bold", size = 30),
        axis.ticks = element_blank(),
        legend.text = element_text(size = 25),
        axis.title = element_text(size = 25, face = "bold"),
        axis.text = element_text(size = 25, vjust = 0.05),
        legend.position = "bottom")

oh noes! both of them are centered over the graph

Now, if I'm willing to just "fake it" by hand-spacing each title, I can sort of get it to work, but this seems time intensive and crude.

# sloppy solution
ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, color = Species, shape = Species))+
  geom_jitter(size = 6.5)+
  ggtitle("A \n \n             The Actual Long, Normal Title of Titliness")+
  theme(plot.title = element_text(hjust = 0,face = "bold", size = 30),
        axis.ticks = element_blank(),
        legend.text = element_text(size = 25),
        axis.title = element_text(size = 25, face = "bold"),
        axis.text = element_text(size = 25, vjust = 0.05),
        legend.position = "bottom")

better spacing but sloppy code

Is there a way to call each 'line' of the title individually for an hjust value of its own?

Any other creative solutions?

Also, I saw potential in mtext (Splitting axis labels with expressions), but couldn't figure out how to implement it with ggplot2 (vs base plot function.. it seems like they're not compatible). This post was all sorts of interesting (Multi-line ggplot Title With Different Font Size, Face, etc), but I am still new to R and I couldn't figure out how to edit this clever stuff to change indentation.

Thanks!

like image 800
CatsCauseTypos Avatar asked Nov 28 '17 03:11

CatsCauseTypos


2 Answers

Update: Since ggplot2 3.0.0 there is now native support for plot labels, see this answer.

Here is how I would do it, using the cowplot package that I wrote specifically for this purpose. Note that you get a clean theme as a bonus.

library(cowplot)

p <- ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, color = Species, shape = Species)) +
  geom_jitter(size = 3.5) +
  ggtitle("The Actual Long, Normal Title of Titliness")

# add one label to one plot
ggdraw(p) + draw_plot_label("A")

enter image description here

# place multiple plots into a grid, with labels
plot_grid(p, p, p, p, labels = "AUTO")

enter image description here

You then want to use the save_plot function to save plots instead of ggsave, because save_plot has defaults and parameters that help you get the scaling right relative to the theme, in particular for plots in a grid.

like image 54
Claus Wilke Avatar answered Oct 26 '22 12:10

Claus Wilke


Since ggplot2 3.0.0, there is a native way to do this, using the tag label:

ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, color = Species, shape = Species)) +
  geom_point() +
  labs(title = "The Actual Long, Normal Title of Titliness",
       tag = "A")

ggplot_tag

like image 34
Droplet Avatar answered Oct 26 '22 14:10

Droplet