如何将标签添加到堆叠条形图

Question

我希望将数值添加到堆积条形图中每个堆栈的中间（代码如下）。我发现的大多数示例都针对一列中的信息，每当我尝试修改它时，都会遇到有关长度要求的错误。

DA <- data.frame(
  Imp=c("2015","2019"),
  "mismatch"=c(220,209),
  "match"=c(3465,3347),
  "NA"=c(501,630),
  check.names = FALSE)

DA %>%
  pivot_longer(-Imp) %>%
  ggplot(aes(x = Imp, y = value, fill = name)) + geom_col(position = "stack") + 
  scale_fill_manual(name=" ", values=c("aquamarine4", "orange", "coral")) +
  theme_light() +
  theme(legend.position = "bottom") +
  scale_y_continuous(expand = c(0,0)) +
  geom_text(aes(x=1, y=4300, label="Stretch it"), vjust=-1) +
  labs(y="Count", x="Imputed Genotypes") +
  geom_bar(stat = "identity", color="white", width = 1) 

Answer 1

像这样？

library(tidyverse)

DA <- data.frame(
  Imp=c("2015","2019"),
  "mismatch"=c(220,209),
  "match"=c(3465,3347),
  "NA"=c(501,630),
  check.names = FALSE)

DA %>%
  pivot_longer(-Imp) %>%
  ggplot(aes(x = Imp, y = value, fill = name)) +
  geom_col(color = "white", lwd = 1,
           position = "stack", width = 0.75) + 
  scale_fill_manual(name="", values=c("aquamarine4", "orange", "coral")) +
  scale_y_continuous(expand = c(0,0),
                     limits = c(0, 4200)) +
  labs(y="Imputed Genotypes (Count)") +
  geom_text(aes(label = value), color = "white", size = 5, 
            position = position_stack(vjust = 0.5), 
            show.legend = FALSE) +
  theme_light(base_size = 18) +
  theme(legend.position = "right",
        axis.title.x = element_blank())

^{由reprex package (v2.0.1) 于 2021 年 12 月 19 日创建}