如何在使用facet_grid时更改构面边框的颜色 [英] How to change color of facet borders when using facet_grid

问题描述

当使用 facet_grid 时， ggplot2 会将构成方面变量的主要类别用大于 - 通常的白线。这非常适合大多数目的。有时我想更清楚地显示这些主要分类之间的分歧，并希望以另一种颜色遮蔽分面。有没有办法做到这一点？感谢。

When using facet_grid, ggplot2 divides the major categories that make up the facet variables with a broader-than-usual white line. This serves most purposes well. Sometimes I want to more clearly show the divisions between these major categorizations and would like to shade the facet division with another color. Is there a way to do that? Thanks.

推荐答案

尽管一年后，我发现这是一个简单的解决方案：

Although a year late, I found this to be an easy fix:

ggplot(mpg, aes(cty, hwy, color = factor(year)))+ 
  geom_point()+
  facet_grid(cyl ~ drv) +
  theme(panel.margin=unit(.05, "lines"),
        panel.border = element_rect(color = "black", fill = NA, size = 1), 
        strip.background = element_rect(color = "black", size = 1))

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