对齐多面图和图例

Question

我正在尝试绘制各个方面，每个方面都有自己的图例。但是，我在正确对齐它们时遇到了一些麻烦。

dat <- structure(list(group1 = structure(c(1L, 1L, 2L, 2L, 2L), .Label = c("A", 
"B"), class = "factor"), group2 = structure(c(1L, 2L, 1L, 3L, 
2L), .Label = c("a", "b", "c"), class = "factor"), x = c("1", 
"2", "3", "4", "2"), y = c("1", "2", "3", "4", "3")), .Names = c("group1", 
"group2", "x", "y"), row.names = c(NA, 5L), class = "data.frame")

dat <- split(dat, f = dat$group1)

library(ggplot2)
p1 <- ggplot(dat$A) +
  geom_point(aes(x=x, y=y, colour=group2)) +
  facet_wrap(~group1) +
  guides(colour=guide_legend(nrow=2)) +
  scale_colour_manual(values=c(a = "green", b = "red", c = "blue"), 
                      labels=c(a = "green", b = "red", c = "blue"))

p2 <- p1 %+% dat$B

使用 gridExtra 问题是绘图不对齐：

library(gridExtra)
grid.arrange(p1, p2, p2, p1, ncol=2)

并且使用 cowplot 的图例有点居中：

library(cowplot)
plot_grid(p1, p2, p2, p1, ncol=2, align="hv")

我尝试添加 legend.justification and/or legend.position 但没有效果。

如何让 plots/legends 对齐？

Answer 1

你可以试试the experimental egg package.

grid.draw(ggarrange(plots=list(p1,p2,p2,p1)))

请注意，ggplot2 有在每次更新时破坏此类代码的习惯，因此请将其视为脆弱的解决方法。

对齐多面图和图例

Aligning facetted plots and legends

r

ggplot2

gridextra

cowplot