如何将我的方面标签 (strip.background) 的颜色更改为与其条形相同的颜色？

Question

我有一个 facet_grid 图总结了每个类别的基因分布，如下所示。我想更改刻面标签/strip.background（代码中带有红色框和“类别”的那个）的颜色，使其与其对应的图相似。

如何增加条形之间的间距（而不是面之间的间距）以使其更具可读性？正如您在 y 轴标签（被黑框覆盖）上看到的那样，由于有很多数据，它正在被压缩并且标签变得不可读。

ggplot(allVFs, aes(x=Dist,y=genes)) + 
  geom_bar(stat="identity", width = 0.75, size = 0.05 ) +
  facet_grid(Categories ~., scales = "free", space = "free") +
  labs( x = "Distribution (%)", y = "Genes", title = "VFs per category" ) +
  theme( strip.text = element_text( size = 8, color = "white", hjust = 0.5),
         strip.text.y = element_text(angle=0),
         strip.background = element_rect( fill = "#5675D6"), # I tried changing this but couldn't make it similar to the bar colors
         panel.background = element_rect( fill = "#efefef"),
         panel.grid.major.x = element_blank(),
         panel.grid.minor.x = element_blank(),
         panel.grid.minor.y = element_blank(),
         panel.grid.major.y = element_line( color = "#C0C0C0" ),
         panel.spacing.x = unit( 0.8, "cm" ),
         panel.spacing.y = unit( 0.5, "cm" ),
         legend.position = "none" ) +
  geom_text(aes( label = paste0( Dist, "%" ), y = genes),
            vjust = 0, size = 2, color = "black" ) +
  aes(fill = as.factor(Categories)) #This gives the color to each facet that I want to replicate with the facet labels

如有任何改进此情节的建议，我们将不胜感激！

Answer 1

这在 ggplot2 中是不可能的，但我们可以深入研究 gtable 对象来实现结果。

我将使用示例图和数据。但这也适用于您的示例：

library(ggplot2)
g <- ggplot(iris, aes(x = Sepal.Length, fill = Species)) +
  geom_bar() +
  facet_grid(Species ~ .)

# Find the colors used
fill_colors <- unique(ggplot_build(g)$data[[1]]$fill)

# Find strips glob
gt<-ggplot_gtable(ggplot_build(g))
strips <- which(startsWith(gt$layout$name,'strip'))

# Change the fill color of each strip
for (s in seq_along(strips)) {
  gt$grobs[[strips[s]]]$grobs[[1]]$children[[1]]$gp$fill <- fill_colors[s]
}

plot(gt)

^{由 reprex package (v0.3.0)}

于 2020-11-26 创建

我们正在做的是找到包含每个条带的网格对象，并使用从绘图中提取的颜色手动更改其填充属性。

如何将我的方面标签 (strip.background) 的颜色更改为与其条形相同的颜色？

How can I change the color of my facet label (strip.background) to be the same as its bars?

r

ggplot2

geom-bar

facet-grid