Changing Font Size and Direction of Axes Text in Ggplot2

Changing font size and direction of axes text in ggplot2

Use theme():

d <- data.frame(x=gl(10, 1, 10, labels=paste("long text label ", letters[1:10])), y=rnorm(10))
ggplot(d, aes(x=x, y=y)) + geom_point() +
    theme(text = element_text(size=20),
        axis.text.x = element_text(angle=90, hjust=1)) 
#vjust adjust the vertical justification of the labels, which is often useful

There's lots of good information about how to format your ggplots here. You can see a full list of parameters you can modify (basically, all of them) using ?theme.

Change size of axes title and labels in ggplot2

You can change axis text and label size with arguments axis.text= and axis.title= in function theme(). If you need, for example, change only x axis title size, then use axis.title.x=.

g+theme(axis.text=element_text(size=12),
        axis.title=element_text(size=14,face="bold"))

There is good examples about setting of different theme() parameters in ggplot2 page.

ggplot2: theme(axis.text=element_text(size=3) does not change font size on the y-axis

Because you haven't specified which axis you want to change in you code, the axis.text is interpreted as applying only to the x axis, as that is always the first axis to be dealt with.

Therefore code should be:

+ theme(axis.text.x = element_text(size = 3),
        axis.text.y = element_text(size = 3))

Multi-line ggplot Axis title with different font size and styles

One option would be the ggtext package which via the theme element element_markdown allows to style theme elements via markdown, HTML and CSS.

To achieve your desired result you have to wrap the parts of your text for which you want to have different font sizes in a <span> tag for which you could set the desired font-size via the style attribute. Also note, that as we are in the World of HTML we have to use a <br> tag for a line break.

Also keep in mind that not all possibilities of CSS are available. According to the docs only

The CSS properties color, font-size, and font-family are currently supported.

library(ggplot2)
library(ggtext)

ggplot(mtcars, aes(wt, mpg)) + 
  geom_point() +
  labs(
    x = paste0("<span style='font-size: 11pt'>This is the axis of</span><br><span style='font-size: 12pt'>wt</span>"),
    y = paste0("<span style='font-size: 11pt'>This is the axis of</span><br><span style='font-size: 12pt'>mpg</span>")) +
  theme(axis.title.x = ggtext::element_markdown(),
        axis.title.y = ggtext::element_markdown())

Rotating and spacing axis labels in ggplot2

Change the last line to

q + theme(axis.text.x = element_text(angle = 90, vjust = 0.5, hjust=1))

By default, the axes are aligned at the center of the text, even when rotated. When you rotate +/- 90 degrees, you usually want it to be aligned at the edge instead:

The image above is from this blog post.

Change Font of ggplot Title and Data Label

You can run in the theme command, text = element_text(family = "Comic Sans MS") to change the font. You can run this code:

 mydf %>%
   gather(Month, Total, -Category) %>%
   mutate(Month = reorder(Month, row_number())) %>%
   mutate(Category = reorder(Category, row_number())) %>%
   ggplot(aes(Month, Total, fill = Category, group = Category)) +
   geom_text(aes(label=Total), position=position_dodge(width=0.9), vjust=-0.25) +
   scale_fill_manual(values = c("dark green", "red")) +
   geom_bar(stat = "identity", position = "dodge") +
   labs(x = "", y = "", title = "Title of Plot", subtitle = "Subtitle of Plot") +
   theme_bw() +
   theme(legend.position = "bottom",
         legend.title = element_blank(),
         legend.key.size = unit(0.5, 'cm'),
         legend.text = element_text(size=7),
         panel.grid.major.x = element_blank(),
         panel.border = element_blank(),
         plot.title = element_text(hjust = 0),
         plot.subtitle = element_text(size=8, hjust=0, face="italic", color="black"),
         axis.text.x = element_text(size = 10, face = "bold", color="black")) +
   theme(text = element_text(family = "Comic Sans MS"))

Output:

Can you vary text size within the same ggplot2 axis?

You can create a vector of text sizes and add it using element_text()

library(ggplot2)
ggplot(mtcars, aes(x = mpg, y = hp)) + 
    geom_point() + 
    theme(
        axis.text.x = element_text(size = rep(c(12,24), 3))
    )

Change the font size of a ggplot chart

Size of texts are changed using function theme() and then choosing element you need to modify. To set font size for all texts in plots attribute text should be changed.

ggplot(mtcars,aes(cyl,mpg))+geom_point()+theme(text=element_text(size=21))

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