如何在ggplot2中的图例中斜体显示一个类别 [英] How to italicize one category in a legend in ggplot2

问题描述

对于我在ggplot2中的图例，我有2个类别，我该如何仅将1个类别用斜体表示，而将其他类别用斜体表示呢?

For my legend in ggplot2 I have 2 categories, how do I italicize only 1 category and not the other?

作为示例，请考虑以下图表.如何设置斜体的手册"?

As an example, consider the following plot. How can I set "Manual" in italics?

library(ggplot2)

ggplot(data = mtcars, aes(x = as.factor(am), fill = as.factor(am))) + 
  geom_bar() + 
  scale_fill_discrete(
    "Transmission",
    breaks = c(0, 1),
    labels = c("Automatic", "Manual")
  )

^{由 reprex软件包(v0.3.0)创建于2020-01-01 sup>}

^{Created on 2020-01-01 by the reprex package (v0.3.0)}

推荐答案

您可以使用expression和italic在标签上创建斜体文本.

You can use expression and italic to create italicized text on labels.

library(ggplot2)

ggplot(data = mtcars, aes(x = as.factor(am), fill = as.factor(am))) + 
  geom_bar() + 
  scale_fill_discrete(
    "Transmission",
    breaks = c(0, 1),
    labels = c("Automatic", expression(italic("Manual")))
  )

^{由 reprex软件包(v0.3.0)创建于2020-01-01 sup>}

^{Created on 2020-01-01 by the reprex package (v0.3.0)}

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