在特定的轴刻度上应用粗体 [英] Apply bold font on specific axis ticks

问题描述

这是情节:

library(ggplot2)
library(tibble)

ggplot(head(mtcars) %>% rownames_to_column("cars"),
       aes(x = reorder(cars, - drat), 
           y = drat)) +
  geom_col() +
  coord_flip()

如何在特定的汽车名称上(例如仅在"Hornet 4 Drive"和"Datsun 710"上)应用粗体?

How can I apply bold font on specific car names (for example just on "Hornet 4 Drive" and "Datsun 710")?

我希望使用一个相当通用"的答案，即可以轻松地应用特定颜色或其他字体系列而不是粗体字体的答案.

I would prefer a quite "general" answer, i.e an answer that makes it easy to apply a particular color or another font family instead of bold font.

推荐答案

ggtext允许您将markdown和html标签用于轴标签和其他文本.因此，我们可以创建一个函数传递给scale_y_discrete的labels参数(如@RomanLuštrik在其注释中建议的那样)，通过该函数我们可以选择要突出显示的标签，颜色和字体系列:

ggtext allows you to use markdown and html tags for axis labels and other text. So we can create a function to pass to the labels argument of scale_y_discrete (as @RomanLuštrik suggested in their comment), through which we can select the labels to highlight, the color, and the font family:

library(tidyverse)
library(ggtext)
library(glue)

highlight = function(x, pat, color="black", family="") {
  ifelse(grepl(pat, x), glue("<b style='font-family:{family}; color:{color}'>{x}</b>"), x)
}

head(mtcars) %>% rownames_to_column("cars") %>% 
  ggplot(aes(y = reorder(cars, - drat), 
             x = drat)) +
  geom_col() +
  scale_y_discrete(labels= function(x) highlight(x, "Datsun 710|Hornet 4", "red")) +
  theme(axis.text.y=element_markdown())

iris %>% 
  ggplot(aes(Species, Petal.Width)) +
  geom_point() + 
  scale_x_discrete(labels=function(x) highlight(x, "setosa", "purple", "Copperplate")) +
  theme(axis.text.x=element_markdown(size=15))

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