在ggplot2中的图例键中更改符号 [英] Change the symbol in a legend key in ggplot2

问题描述

此R代码产生一个ggplot2图，其中图例键包含以红色，蓝色和绿色重复的字母"a".

This R code produces a ggplot2 graph in which the legend key contains the letter "a" repeated in red, blue and green.

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")) 

我想将图例键中重复的"a"替换为"F"，"K"和"G".

I would like to replace the repeated "a" in the legend key with "F", "K" and "G".

这可能吗?谢谢.

推荐答案

Adapting code for this answer: The idea is to inhibit the geom_text legend, but to allow a legend for geom_point, but make the point size zero so the points are not visible in the plot, then set size and shape of the points in the legend in the guides statement

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")) 

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