如何在ggplot2中更改图例的背景颜色? [英] How to change background colour of legend in ggplot2?

问题描述

有人知道如何更改ggplot2中图例的背景颜色.我在下面创建了剧情，想更改图例上的白色背景吗?有什么想法吗?

Does anybody know how to change the background colour for the points legend in ggplot2. I have created the plot below and would like to change the white background on the legend? Any ideas?

推荐答案

您可以使用theme的legend.key参数.来自?theme:

You can use the legend.key parameter of theme. From ?theme:

legend.key:图例键(element_rect()；从rect继承)下的背景

legend.key: background underneath legend keys (element_rect(); inherits from rect)

那是

theme(legend.key = element_rect(fill = "black"))

一个例子:

a <- seq(1:5)
b <- seq(1:5)
c <- seq(1:5)
d <- data.frame(a, b, c)
ggplot(data = d, aes(x = a, y = b, color = factor(c))) +
  geom_point() +
  theme(legend.key = element_rect(fill = "yellow"))

产生:

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