饼图 - 如何在正确的位置获取百分比文本？

Question

我无法在饼图的正确位置显示百分比信息。有人可以非常友好地帮助我吗？非常感谢！

        #sample dataframe       
        d <- data.frame(facet=c('a','b','c', "d"), value=c('0.46','0.11','0.18', "0.25"))
        d$value <- as.numeric(as.character(d$value))


blank_theme <- theme_minimal()+
  theme(
    axis.title.x = element_blank(),
    axis.title.y = element_blank(),
    panel.border = element_blank(),
    panel.grid=element_blank(),
    axis.ticks = element_blank(),
    plot.title=element_text(size=14, face="bold")
  )

        d$perc <- round(d$value/sum(d$value) * 100,0)
        d$pos <-  cumsum(d$perc) - sapply(d$perc,function(x) cumsum(x)-0.5*x)

        bp <- ggplot(data=d, aes(x="", y=perc, fill=facet))+
          geom_bar(width = 1, stat = "identity") + 
          geom_text(aes(x="", y=pos, label=paste0(perc,"%"))) +
          #geom_text(aes(x="", y=value/4+ c(0, cumsum(value)[-length(value)]), label=percent(value/100))) 
          scale_fill_manual(values = c("a" = "#b2df8a", "b" = "#238b45", "c" = "#636363", "d"="orange"))
        bp

        pie <- bp +  coord_polar("y", start=0) + blank_theme +
          theme(axis.text.x=element_blank())  
        pie

Answer 1

这可以通过 ggpiestats 函数直接实现。它只需要对您的数据框进行轻微修改-

library(ggstatsplot)
set.seed(123)

# data
d <-
  data.frame(
    facet = c('a', 'b', 'c', "d"),
    value = c(46, 11, 18, 25)
  )

# plot with statistical details in the subtitle
ggstatsplot::ggpiestats(data = d,
                        main = facet,
                        counts = value)

如果你不想要统计测试细节，想进一步自定义剧情的美感，你也可以使用ggplot2函数-

# customizing it further
# change the slice label
ggstatsplot::ggpiestats(data = d,
                        main = facet,
                        counts = value,
                        slice.label = "both",
                        package = "wesanderson",
                        palette = "Royal2") +
  ggplot2::labs(subtitle = NULL)

^{由 reprex package (v0.2.1)}

创建于 2019-02-09

Answer 2

碰巧由于某种原因ggplot2在处理标签时走向了另一个方向。因此，而不是使用

d$pos <-  100 - (cumsum(d$perc) - sapply(d$perc, function(x) cumsum(x) - 0.5 * x))

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饼图 - 如何在正确的位置获取百分比文本？

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