Hi this simple code (and all my scripts from this morning) has started giving me a off center title in ggplot2
Ubuntu version: 16.04
R studio version: Versi
As stated in the answer by Henrik, titles are left-aligned by default starting with ggplot 2.2.0. Titles can be centered by adding this to the plot:
theme(plot.title = element_text(hjust = 0.5))
However, if you create many plots, it may be tedious to add this line everywhere. One could then also change the default behaviour of ggplot with
theme_update(plot.title = element_text(hjust = 0.5))
Once you have run this line, all plots created afterwards will use the theme setting plot.title = element_text(hjust = 0.5)
as their default:
theme_update(plot.title = element_text(hjust = 0.5))
ggplot() + ggtitle("Default is now set to centered")
To get back to the original ggplot2 default settings you can either restart the R session or choose the default theme with
theme_set(theme_gray())
If you are working a lot with graphs and ggplot, you might be tired to add the theme() each time. If you don't want to change the default theme as suggested earlier, you may find easier to create your own personal theme.
personal_theme = theme(plot.title =
element_text(hjust = 0.5))
Say you have multiple graphs, p1, p2 and p3, just add personal_theme to them.
p1 + personal_theme
p2 + personal_theme
p3 + personal_theme
dat <- data.frame(
time = factor(c("Lunch","Dinner"),
levels=c("Lunch","Dinner")),
total_bill = c(14.89, 17.23)
)
p1 = ggplot(data=dat, aes(x=time, y=total_bill,
fill=time)) +
geom_bar(colour="black", fill="#DD8888",
width=.8, stat="identity") +
guides(fill=FALSE) +
xlab("Time of day") + ylab("Total bill") +
ggtitle("Average bill for 2 people")
p1 + personal_theme
From the release news of ggplot 2.2.0
: "The main plot title is now left-aligned to better work better with a subtitle". See also the plot.title
argument in ?theme
: "left-aligned by default".
As pointed out by @J_F, you may add theme(plot.title = element_text(hjust = 0.5))
to center the title.
ggplot() +
ggtitle("Default in 2.2.0 is left-aligned")
ggplot() +
ggtitle("Use theme(plot.title = element_text(hjust = 0.5)) to center") +
theme(plot.title = element_text(hjust = 0.5))
The ggeasy
package has a function called easy_center_title()
to do just that. I find it much more appealing than theme(plot.title = element_text(hjust = 0.5))
and it's so much easier to remember.
ggplot(data = dat, aes(time, total_bill, fill = time)) +
geom_bar(colour = "black", fill = "#DD8888", width = .8, stat = "identity") +
guides(fill = FALSE) +
xlab("Time of day") +
ylab("Total bill") +
ggtitle("Average bill for 2 people") +
ggeasy::easy_center_title()
Note that as of writing this answer you will need to install the development version of ggeasy
from GitHub to use easy_center_title()
. You can do so by running remotes::install_github("jonocarroll/ggeasy")
.