How to add a second group legend in ggplot (R)?-CodePudding

As you can see from the graph below, ggplot automatically change the graphs color based on a second group division (literally group2). Now, what I am not able to do is to print a legend for it. I would like under gender with their respective color to be added group2 legend with their respective color or maybe just to manually label them as such.

set.seed(34)
data <- data.frame(gender = rep(c("female", "male"), length.out=10),
    group2 = sample(letters[1:2], 10, replace = T),
    group = rep(letters[11:13], length.out=10),
    nums = as.integer(runif(10, min=10, max=500)))

xc <- data %>%
    group_by(group) %>%
    mutate(sum=sum(nums)) %>%
    group_by(gender, group2, group) %>%
    mutate(prop = nums/sum*100)

ggplot(xc, aes(x=group, fill = gender, color = group2, y = prop))  
    geom_col(position="dodge", color = "white", alpha = 0.85)  
    scale_fill_manual(values = c("#466760","#845574"))  
    theme_minimal()  
    theme()  
    ggtitle("")  
    xlab("")  
    ylab("Percentage %")

My plot:

Example Plot

CodePudding user response：

Hard to tell what you are trying to achieve, maybe this approach could be useful:

library(dplyr)
library(ggplot2)

ggplot(xc, aes(x = gender, y = prop, fill = group2))  
  geom_col(position = position_dodge2(preserve = "single", padding = 0.01), alpha = 0.85)  
  scale_fill_manual(values = c("#466760", "#845574"))  
  facet_wrap(~group, nrow = 1) 
  theme_bw()  
  theme(panel.border = element_blank())  
  ggtitle("")  
  xlab("")  
  ylab("Percentage %")

^{Created on 2022-02-07 by the reprex package (v2.0.1)}