如何使用geom_bar在ggplot2中制作连接的条形图? [英] How to use geom_bar for making connected bar plot in ggplot2?

问题描述

我正在尝试使用geom_bar获取条形图

I'm trying to use geom_bar for getting a bar plot

用线连接.如何绘制样本之间的连接线?

connected with lines. How to draw connecting lines between samples?

ggplot()+
  geom_bar(data = data_bar,
           aes(x = Sample, y =Percentage, fill = Taxon),
           colour = 'white', width =0.3, stat="identity")+
  guides(fill= guide_legend(ncol = 1))

我同时使用geom_bar和geom_line进行了尝试，但看起来很奇怪

I tried it by using both geom_bar and geom_line, but it looks weird

.

似乎连接的线从A样本的中心开始到B样本的中心.

It looks like connected line starts from the center of A sample to the center of B sample.

ggplot()+
  geom_bar(data = data_bar,
           aes(x = Sample, y =Percentage, fill = Taxon),
           colour = 'white', width =0.3, stat="identity")+
  geom_line(data = rev(data),
            aes(x = Sample, y =Percentage, group = Taxon, color = Taxon),
            size = 0.3, stat = 'identity')+
  guides(fill= guide_legend(ncol = 1))

我想获得更好的图，例如连接的线从A样本的条的右边缘开始到B样本的条的左边缘开始.

I want to get a better plot like connected line starts from the right edge on the bar of A sample to the left edge on the bar of B sample.

我该怎么做?

推荐答案

我不知道执行此操作的内置方法，但是如果您知道，可以使用 geom_segment 完成相同的操作酒吧在哪里.

I'm not aware of a built-in way to do this, but you can accomplish the same using geom_segment if you know where the bars are.

首先提供一些虚假数据:

First some fake data:

set.seed(0)
data_bar <- data.frame(
  stringsAsFactors = F,
  Sample = rep(c("A", "B"), each = 10),
  Percentage = runif(20),
  Taxon = rep(1:10, by = 2)
)

为了简化连接，我将数据扩展为宽格式，以便每条连接线都获得一行，其中一列与第一个Sample相关，另一列与第二个Sample相关:

To make the connections simpler, I spread the data to wide format so each connecting line gets a row, with one column related to the first Sample and the other for the 2nd Sample:

library(tidyverse)
ggplot() +
  geom_bar(data = data_bar,
           aes(x = Sample, y =Percentage, fill = Taxon),
           colour = 'white', width = 0.3, stat="identity") +
  geom_segment(data = tidyr::spread(data_bar, Sample, Percentage)
               colour = "white",
               aes(x = 1 + 0.3/2,
                   xend = 2 - 0.3/2,
                   y = cumsum(A),
                   yend = cumsum(B))) +
  theme(panel.background = element_rect(fill = "black"), # to make connecting points          
        panel.grid = element_blank())                    # show up more clearly

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