ggplot：对齐多个多面图 - 所有不同大小的面

Question

我正在尝试将多个图与小平面对齐。我的问题有点小但很烦人：我可以绘制一个绘图，使绘图区域对齐并且小平面本身对齐，但小平面条的宽度并不完全相同。如果分面的标签长度不同，则分面条的大小将调整为文本可以适合分面。到目前为止，我无法找到一种方法在对齐多个图时使所有小平面条具有相同的宽度。

这是我想要对齐的图类型的示例以及我为对齐它们所做的努力：

library(data.table)
library(ggplot2)
library(foreach)
library(stringr)
library(cowplot)

# example data to show how aligning faceted plots is not quite right
plotvars = c(paste0("plot1_var", 1:7), paste0("plot2_var",1:5), paste0("plot3_var",1:10))
data = 
  foreach(p=plotvars,.combine = "rbind") %do% {
    d = data.table(plot = rep(str_extract(p,pattern = "plot[[:digit:]]"),2),
               plot_variables = rep(p,2),
               fill_categories = c("fill1","fill2"),
               number = sample(1:1000, size = 2))
    d[, facet_variables := ifelse(plot=="plot1", 
                                  rep(sample(paste0("facet",1:3),size=1),2),
                                  ifelse(plot=="plot2",
                                         rep(sample(paste0("facet_title",1:3),size=1),2),
                                         ifelse(plot=="plot3",
                                                rep(sample(paste0("facet_title_longer",1:3),size=1),2),
                                                NA)))]
    d
  }

# function to make stacked barplots with facets + coord_flip
make_plot = function(data, plot_var) {
  ggplot(data[plot==plot_var],
         aes(x=plot_variables,
             y=number,
             fill=fill_categories))+
    geom_bar(stat="identity")+
    coord_flip()+
    facet_grid(facet_variables ~ ., 
               space="free",
               scales="free")+
    theme(strip.text.y = element_text(angle=0),
          legend.position = "none")
}
p1 = make_plot(data=data,plot_var="plot1")
p1

p2 = make_plot(data=data,plot_var="plot2")
p2

p3 = make_plot(data=data,plot_var = "plot3")
p3

# using 'cowplot::plot_grid' gives strange re-sizing of individual bars
cowplot::plot_grid(p1,p2,p3, ncol=1,nrow=3,align = "hv")

# try gtable_rbind version
g1=ggplotGrob(p1)
g2=ggplotGrob(p2)
g3=ggplotGrob(p3)

# this plot keeps the bar widths the correct size, but the facets are still incorrectly different widths.
ggdraw(gridExtra::gtable_rbind(g1,g2,g3))

如何使小平面条带在绘图中具有相同的宽度？

Answer 1

更改此部分

facet_grid(facet_variables ~ ., 
           space="free",
           scales="free")+

至

facet_grid(facet_variables ~ ., 
           space="fixed",    # This is the difference
           scales="free")+

Answer 2

您可以使用标签功能实现类似的功能，该功能可以插入第二行任意长度的空格。使用 mtcars...

#define a function to add a second line of spaces after a given label 
#and a blank line before to maintain the centre vertical alignment
#you might need to play with the appropriate value to get the width right
widen <- function(x) paste(" \n", x, "\n", paste0(rep(" ", 20), collapse=""))

mtcars %>% ggplot(aes(x = mpg)) +
  geom_histogram() +
  facet_grid(cyl ~ ., labeller = labeller(cyl = widen)) +
  coord_flip() +
  theme(strip.text.y = element_text(angle = 0))

Answer 3

刻面条被另一个 table 包裹着，您需要调整那里的宽度。以下似乎有效。

g1 <- ggplotGrob(p1)
g2 <- ggplotGrob(p2)
g3 <- ggplotGrob(p3)

# g3 has the widest strips, so get the width from there and copy over
# to the other plots
stripwidth <- g3$grobs[[13]]$widths 
g1$grobs[[13]]$widths <- stripwidth
g1$grobs[[14]]$widths <- stripwidth
g1$grobs[[15]]$widths <- stripwidth

g2$grobs[[13]]$widths <- stripwidth
g2$grobs[[14]]$widths <- stripwidth
g2$grobs[[15]]$widths <- stripwidth

ggdraw(gridExtra::gtable_rbind(g1,g2,g3))

ggplot：对齐多个多面图 - 所有不同大小的面

ggplot: align multiple faceted plots - facets all different sizes

r

data-visualization

ggplot2

gridextra

cowplot