如何在ggarrange中编辑常见图例标题？

Question

如何使用ggarrange编辑常见的图例标题（将其变为粗体并放大字体大小）？

根据我拥有的六个图（从p1到p6），我认为以下方法会起作用：

p6 <-  p6 + theme(legend.title = element_text(size = 15, face = "bold")

下面的ggarrange用于合并六个图：

p <- ggarrange(p1, p2, p3, p4, p5, p6,
          common.legend = TRUE, 
          legend = "bottom", 
          labels = c("1", "2", "3", "4", "5", "6"),
          # font.label = list(size = 10, color = "green"),
          nrow = 2, ncol = 4
          )

但是，这不会改变通用图例。

Answer 1

您可以从感兴趣的地块中提取图例，然后将该图例与地块并排放置。

#libraries:

library(ggplot2)
library(ggpubr)
library(gridExtra)
library(grid)

#example plots:

p1 <- ggplot(mtcars) + 
        geom_point(aes(x=mpg, y=qsec, color = factor(cyl)))

p2 <- ggplot(mtcars) + 
        geom_point(aes(x=mpg, y=4*drat, color = factor(cyl))) + 
        theme(legend.title = element_text(size = 15, face = "bold"),
              legend.position="bottom")

#function to extract the legend of a ggplot; source:
#https://github.com/hadley/ggplot2/wiki/Share-a-legend-between-two-ggplot2-graphs

get_legend<-function(a.gplot){
  tmp <- ggplot_gtable(ggplot_build(a.gplot))
  leg <- which(sapply(tmp$grobs, function(x) x$name) == "guide-box")
  legend <- tmp$grobs[[leg]]
  return(legend)}

#arranging the legend and plots in a grid:

p2_legend <- get_legend(p2)

grid.arrange(arrangeGrob(p1 + theme(legend.position="none"), 
                         p2 + theme(legend.position="none"), nrow=2), 
             p2_legend, 
             nrow=2,heights=c(10, 1))