1. 效果图

2. 代码

# 生成测试数据
dif=data.frame(
  labels=paste0("pathway", 1:3),
  up=c(30,15,1),
  down=c(10,20,40)
)
rownames(dif)=dif$labels
dif

#变形
dif=reshape2::melt(dif)
dif

# 绘图
ggplot(dif, aes(x=labels, y=ifelse(variable=="up", value, -value), fill=variable ) )+
  geom_bar(stat="identity")+
  geom_text(
    aes(label=value,
        vjust=ifelse(variable=="up", -0.4, 1.1),  #调整上下数字的位置坐标
    ),
    size=4 #number font size
  )+
  scale_fill_manual(name="Change", values = c("#ae3137", "#497aa2"),
                    breaks = c("up", "down"), #原始图例标签
                    labels = c("lengthen", "shorten"), #新图例标签
                    )+
  scale_y_continuous(
    labels=abs, #y轴 显示绝对值
    expand=expansion(mult=c(0.1, 0.1))
  )+
  labs(x="", y="Gene number", title="compare result")+
  theme_classic(base_size = 12)+
  theme(
    axis.text.x = element_text(angle = 60, hjust = 1, size=12),
    axis.text.y = element_text(size=12),
  )

3. todo

• 继续优化显示效果

• 整理到我的实例笔记 http://tool.dawneve.com/R_scripts/index.html

• https://zhuanlan.zhihu.com/p/445273345