ggplot2优雅的绘制车轱辘图

2022-09-21 14:32:00 浏览数 (2)

❝之前在一篇论文里面看到一张特殊的组合饼图感觉很不错，下面来构建数据进行复现，来看具体案例❞

加载R包

代码语言：javascript复制
library(tidyverse)
library(scales)
library(ggtext)
library(patchwork)
library(cowplot)
library(RColorBrewer)

定义颜色

代码语言：javascript复制
mycolors <- colorRampPalette(brewer.pal(12,"Paired"))(21)

构建数据集

代码语言：javascript复制
df <- tribble(~group,~value,
        "A", 40,
        "B",60)

Figure-1

代码语言：javascript复制
p1 <- df %>% arrange(desc(value)) %>% 
  ggplot(.,aes(x="",y=value,fill=group)) 
  geom_bar(width=1,stat="identity") 
  coord_polar("y",start=0) 
  geom_text(aes(y = value/2   c(0, cumsum(value)[-length(value)]), 
                label = percent(value/100)), size=4) 
  scale_fill_manual(values = mycolors) 
  theme(axis.text.x=element_blank(),
        axis.title.x = element_blank(),
        axis.title.y = element_blank(),
        panel.border = element_blank(),
        panel.grid=element_blank(),
        axis.ticks = element_blank(),
        panel.background = element_blank(),
        legend.position = "none",
        legend.title = element_blank(),
        legend.text = element_text(color="black",size=9), 
        legend.spacing.x=unit(0.1,'cm'),
        legend.key.width=unit(0.5,'cm'),
        legend.key.height=unit(0.5,'cm'), 
        legend.background=element_blank())

数据清洗

代码语言：javascript复制
df2 <- read_tsv("otu_taxa_table.xls") %>% 
  select(OTU:C5,taxonomy) %>% 
  separate(taxonomy,
           into=c("domain","phylum","class","order","family","genus","species"),sep=";") %>% 
  mutate_at(vars(c(`domain`:`species`)),~str_split(.,"__",simplify=TRUE)[,2]) %>% 
  select(A1:C5,genus) %>% drop_na() %>% 
  group_by(genus) %>%  filter(genus !="") %>%  
  count() %>% ungroup() %>% mutate(value=n/sum(n)) %>% arrange(desc(value)) %>%
  mutate(group=case_when(value <  0.0088999644 ~ "others",
                         TRUE ~ as.character(genus))) %>% 
  group_by(group) %>% summarise(value=sum(value)) %>% arrange(desc(value))

df2$group <- factor(df2$group,levels = df2$group)

Figure-2

代码语言：javascript复制
p2 <- df2 %>% ggplot(.,aes(x="",y=value,fill=group)) 
  geom_bar(width=1,stat="identity") 
  coord_polar("y",start=0) 
  scale_fill_manual(values = mycolors) 
  theme(axis.text.x=element_blank(),
        axis.title.x = element_blank(),
        axis.title.y = element_blank(),
        panel.border = element_blank(),
        panel.grid=element_blank(),
        axis.ticks = element_blank(),
        panel.background = element_blank(),
        legend.position = "none",
        legend.title = element_blank(),
        plot.margin=unit(c(0,13,0,0),units="cm"),
        legend.text = element_text(color="black",size=9), 
        legend.spacing.x=unit(0.1,'cm'),
        legend.key.width=unit(0.5,'cm'),
        legend.key.height=unit(0.5,'cm'), 
        legend.background=element_blank())

拼图

代码语言：javascript复制
p2 %>% ggdraw() draw_plot(p1,scale=0.4,x=0.38,y=0)
figure 论文 数据

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