This article describes how to change ggplot legend size. You will learn how to modify the legend title and text size.
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GGPlot2 Essentials for Great Data Visualization in RPrerequisites
Load required packages and set the theme function theme_minimal() as the default theme:
library(ggplot2)
theme_set(theme_minimal())Basic plot
Start by creating a box plot using the ToothGrowth data set. Change the box plot fill color according to the grouping variable dose.
ToothGrowth$dose <- as.factor(ToothGrowth$dose)
p <- ggplot(ToothGrowth, aes(x = dose, y = len))+
geom_boxplot(aes(fill = dose)) +
scale_fill_viridis_d()
p
Chage legend size
The following R code modifies the size of the legend title and text:
p + theme(
legend.title = element_text(color = "blue", size = 14),
legend.text = element_text(color = "red", size = 10)
)
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