将两个图例添加到绘图中

Add Both Legends to a Plot

我有一个图表,我计算了一段时间内两个样本中的基因数量。我想在瀑布图中绘制两组数字。我能够得到图表,但我很难让两个图例都显示出来。我有下表:

    genotype   time degs
1         S  1 dpi   91
2         S  7 dpi  121
3         S 14 dpi  102
4         S 22 dpi  349
9         R  1 dpi  186
10        R  7 dpi  220
11        R 14 dpi  236
12        R 22 dpi  404

    genotype   time degs
5         S  1 dpi  -99
6         S  7 dpi -120
7         S 14 dpi -157
8         S 22 dpi -860
13        R  1 dpi -121
14        R  7 dpi -122
15        R 14 dpi -161
16        R 22 dpi -288

我正在使用以下代码来制作情节:

deg.dn$degs=deg.dn$degs*-1
deg.up$time=as.character(deg.up$time)
deg.dn$time=as.character(deg.dn$time)
deg.up$time = factor(deg.up$time, levels=unique(deg.up$time))
deg.dn$time = factor(deg.dn$time, levels=unique(deg.dn$time))
deg.up$genotype=as.character(deg.up$genotype)
deg.dn$genotype=as.character(deg.dn$genotype)
deg.dn$genotype = factor(deg.dn$genotype, levels=unique(deg.dn$genotype))
deg.up$genotype = factor(deg.up$genotype, levels=unique(deg.up$genotype))
breaksup = levels(deg.up$time)
breaksdn = levels(deg.dn$time)
brewup = c("#FEE5D9", "#FCAE91", "#FB6A4A", "#CB181D")
brewdn = c("#EFF3FF", "#BDD7E7", "#6BAED6", "#2171B5")

ggplot() +
  geom_bar(data = deg.up, aes(x=genotype, y=degs, fill=time), stat="identity", position="dodge") +
  scale_fill_manual(values=brewup, breaks=breaksup) +
  new_scale_fill() +
  geom_bar(data = deg.dn, aes(x=genotype, y=degs, fill=time), stat="identity", position="dodge") +
  scale_fill_manual(values=brewdn, breaks=breaksdn)

breaksupbreaksdn 是数据框中作为唯一字符的时间列。

谁能帮我在最后的情节中把两个传说放在一起?谢谢。

这里有两种将图例并排放置的方法。

第一个只是添加第一个图例并将它们水平排列。要包含两个图例,请在 scale_fill_manual 中指定每个图例的标题。如果两个图例的标题相同,您可以指定图例的顺序。至少要将图例彼此相邻,将 theme 中的 legend.box 设置为水平。


ggplot() +
  geom_bar(data = deg.up, aes(x=genotype, y=degs, fill=time), stat="identity", position="dodge") +
  scale_fill_manual(values=brewup, 
                    breaks=breaksup, 
                    name = "time",
                    guide = guide_legend(order = 1)) +
  new_scale_fill() +
  geom_bar(data = deg.dn, aes(x=genotype, y=degs, fill=time), stat="identity", position="dodge") +
  scale_fill_manual(values=brewdn, 
                    breaks=breaksdn, 
                    name ="time", 
                    guide = guide_legend(order = 2)) +
  theme(legend.box = "horizontal")

第二种方法更具实验性。在您的示例中,您的时间图例具有相同的因子(1、7、14、22),因此您可以将图例放在一起。我通过删除第一个图例标签、第二个图例标题并更改 theme.

中的页边距来实现此目的
ggplot() +
  geom_bar(data = deg.up, aes(x=genotype, y=degs, fill=time), stat="identity", position="dodge") +
  scale_fill_manual(values=brewup, breaks=breaksup, 
                    guide = guide_legend(label = FALSE, 
                                         title = "time", 
                                         order = 1)) +
  new_scale_fill() +
  geom_bar(data = deg.dn, aes(x=genotype, y=degs, fill=time), stat="identity", position="dodge") +
  scale_fill_manual(values=brewdn, 
                    breaks=breaksdn, 
                    guide = guide_legend(title = "",
                    order = 2)) +
  theme(legend.box =  "horizontal",
        legend.margin = margin(0,0,0,-.6, "cm"),
        legend.box.margin =  margin(0,1,0,1, "cm"))