ggplot饼图标签 [英] ggplot pie chart labeling

问题描述

我正在努力使饼图标签正确无误.环顾四周，以为我可以轻松实现 mathematicalCoffee 做到了.到目前为止，我有以下代码:

I am struggling with getting the pie chart labels correct. Looked around and thought that I could easily implement what mathematicalCoffee did. So far I have this code:

ltr = LETTERS[seq( from = 1, to = 26)]

wght = runif(length(ltr))
wght = wght/sum(wght)
wght = round(wght, digits = 2)

alloc = as.data.frame(cbind(ltr, wght))
alloc$wght = as.numeric(as.character(alloc$wght))

ggpie <- function (dat, by, totals) {
  ggplot(dat, aes_string(x=factor(1), y=totals, fill=by)) +
    geom_bar(stat='identity', color='black') +
    guides(fill=guide_legend(override.aes=list(colour=NA))) +
    coord_polar(theta='y') +
    theme(axis.ticks=element_blank(),
          axis.text.y=element_blank(),
          axis.text.x=element_text(colour='black'),
          axis.title=element_blank()) +
    ## scale_fill_brewer(palette = "GnBu") +
    scale_y_continuous(breaks=cumsum(dat[[totals]]) - dat[[totals]] / 2, labels=paste(dat[[by]], ":", dat[[totals]]))    
}

AA = ggpie(alloc, by = "ltr", totals = "wght") +
  ggtitle("Letter weights")

AA

结果饼图:

有什么方法可以生成这样的东西，例如:

Is there any way to generate something like this, for example:

建议的重复项更新-我认为该主题更多地是关于饼图的替代品，以及为什么饼图不好.我想坚持使用饼图，并想找到一种正确/方便用户使用标签的解决方案.

Update for suggested dup - I think that thread is more about alternatives to pie charts and why pie charts are bad. I would like to stick to pie charts and want to find a solution to handling labels correctly/user-friendly.

推荐答案

对于饼图，plot比ggplot容易得多.也许是这样的:

For pie charts plotly works a lot easier than ggplot. Perhaps something like this:

library(plotly)

p <- plot_ly(alloc, labels = ~ltr, values = ~wght, type = 'pie',textposition = 'outside',textinfo = 'label+percent') %>%
  layout(title = 'Letters',
         xaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE),
         yaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE))

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