如何在R的showtext包中调用Google Fonts的Roboto粗体字重

方案1：通过fontface参数直接调用粗体 #

font_add_google默认已经为Roboto字体配置了400（常规）和700（粗体）的字重映射，你只需要在需要加粗的draw_text层添加fontface = "bold"参数即可，修改后代码如下：

library(showtext)
library(cowplot) # ggdraw、draw_text函数来自cowplot包，需提前加载
font_add_google(name = "roboto", family = "roboto") 
showtext_auto()

ggdraw() +
  draw_text("Text1", x = 0.82, y = 0.69, color = "black", size = 35, family = "roboto", fontface = "bold")+
  draw_text("Text1", x = 0.4, y = 0.69, color = "black", size = 35, family = "roboto")+
  draw_text("Text1", x = 0.1, y = 0.69, color = "black", size = 35)

方案2：单独注册Roboto粗体为独立字体族 #

如果方案1在你的环境中不生效，可以直接将Roboto粗体作为单独的字体族导入，调用时直接指定该字体族即可：

library(showtext)
library(cowplot)
# 注册Roboto粗体为独立字体族
font_add_google(name = "roboto", family = "roboto-bold", regular.wt = 700)
# 注册常规Roboto
font_add_google(name = "roboto", family = "roboto") 
showtext_auto()

ggdraw() +
  draw_text("Text1", x = 0.82, y = 0.69, color = "black", size = 35, family = "roboto-bold")+
  draw_text("Text1", x = 0.4, y = 0.69, color = "black", size = 35, family = "roboto")+
  draw_text("Text1", x = 0.1, y = 0.69, color = "black", size = 35)

注意事项 #

• 运行代码前确保设备可以正常连接Google Fonts服务，否则字体会下载失败无法生效
• 如果在RMarkdown/Quarto场景下使用，需要将showtext_auto()放在对应代码块的最开头

内容的提问来源于stack exchange，提问作者LePyka