Tips for using shapes for ggplot2

Change ggplot point shape values. Use special point shapes, including pch 21 and pch 24. The interesting feature of these point symbols is that you can change their background fill color and, their border line type and color
r
ggplot2
shapes
Author

Guorui Zhong

Published

Sunday, May 28, 2023

In ggplot, point shapes can be specified in the function geom_point(). Key arguments include:

ggpubr::show_point_shapes()
## Scale for y is already present.
## Adding another scale for y, which will replace the existing scale.

library(ggplot2)
# Change shape, color and size
ggplot(iris, aes(Sepal.Length, Sepal.Width)) +
  geom_point(shape = 18, color = "#FC4E07", size = 3)+
  theme_minimal()


# Change background fill and line color
ggplot(iris, aes(Sepal.Length, Sepal.Width)) +
  geom_point(shape = 21, fill = "lightgray",
             color = "black", size = 3)+
  theme_minimal()


# Change point shapes and colors by groups
ggplot(iris, aes(Sepal.Length, Sepal.Width)) +
  geom_point(aes(shape = Species, color = Species), size = 3) +
  scale_shape_manual(values = c(5, 16, 17)) +
  scale_color_manual(values = c("#00AFBB", "#E7B800", "#FC4E07"))+
  theme_minimal() +
  theme(legend.position = "top")

Reference