更改ggplot2中图例键中的符号

Question

此R代码生成ggplot2图形，其中图例键包含以红色，蓝色和绿色重复的字母“a”。

x <- rnorm(9); y <- rnorm(9); s <- rep(c("F","G","K"), each = 3)
df <- data.frame(x, y, s)

require(ggplot2)
ggplot(df, aes(x = x, y = y, col = s, label = s)) + 
geom_text() +
scale_colour_discrete(name = "My name", breaks = c("F","K","G"), labels = c("Fbig","Kbig","Gbig")) 

我想用“F”，“K”和“G”替换图例键中重复的“a”。

这可能吗？谢谢。

Answer 1

调整this answer的代码： 这个想法是禁止geom_text图例，但允许geom_point的图例，但是使点大小为零，这样点在图中不可见，然后设置点的大小和形状。 guides陈述中的图例

x <- rnorm(9); y <- rnorm(9); s <- rep(c("F","G","K"), each = 3)
df <- data.frame(x, y, s)
#
require(ggplot2)
#
ggplot(df, aes(x = x, y = y, colour = s, label = s)) +
   geom_point(size = 0, stroke = 0) +  # OR  geom_point(shape = "") +
   geom_text(show.legend = FALSE) +
   guides(colour = guide_legend(override.aes = list(size = 5, shape = c(utf8ToInt("F"), utf8ToInt("K"), utf8ToInt("G"))))) +
   scale_colour_discrete(name = "My name", breaks = c("F","K","G"), labels = c("Fbig","Kbig","Gbig")) 

Answer 2

手动重命名图例添加

+ scale_x_continuous(breaks=c(x1,x2,x3), labels=c("F", "K", "G"))

其中x1，x2，x3是点数