向饼图添加自定义图例

Question

有没有办法添加自定义图例。现在，图例显示的是"a“列，我们可以显示"legend”列吗？因为"legend“列既有标签又有值。我们可以这样做吗？：)

library('ggplot2')
asd <- data.frame(a = c("fds","fdsf"), b = c(3,4))
asd$legend <- paste0(asd$a,"-",asd$b)
ggplot(asd, aes(x="", y=b, fill = a)) + geom_bar(stat = "identity", width = 1) + coord_polar(theta = "y")

Answer 1

可以，只需将填充映射到legend列：

ggplot(asd, aes(x = "", y = b, fill = legend)) + 
  geom_bar(stat = "identity", width = 1) + 
  coord_polar(theta = "y")

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