使用注释向ggplot2添加粗体女性符号

Question

我试图在我的情节中使用女性符号♀.它非常微弱(嗯,它在我的实际图形上看起来很微弱),所以我希望能让它变得大胆.

df <- data.frame(x = c(0, 1), y = c(0, 1))
ggplot(df, aes(x, y)) + geom_point() +
   theme_bw() +
   annotate("text", x = 0.5, y = 0.7, label = "2016 ?", 
   size = 7, hjust = 0, colour = "grey50")

我尝试了以下,但似乎没有工作:

ggplot(df, aes(x, y)) + geom_point() +
   annotate("text", x = 0.5, y = 0.7, label = "2016~bold(?)", 
   size = 7, hjust = 0, parse = TRUE) 

# error message: Error in parse(text = as.character(lab)) : <text>:1:11: unexpected '<'
#1: 2016~bold(<
              ^

ggplot(df, aes(x, y)) + geom_point() +
   annotate("text", x = 0.5, y = 0.7, label = "2016~bold(u2640)", 
   size = 7, hjust = 0, parse = TRUE) 

ggplot(df, aes(x, y)) + geom_point() +
   annotate("text", x = 0.5, y = 0.7, label = "2016~bold(\u2640)", 
   size = 7, hjust = 0, parse = TRUE) 

我也找到了这篇文章,但我不确定我是否可以修改以下代码在ggplot中工作？

plot(df)
text( locator(1), "\\VE", vfont=c("sans serif","bold"), xpd=TRUE)  # Venus 

Answer 1

@Axeman的评论帮助我找到了答案-我不知道您可以加载其他软件包来获取ggplot2的更多字体。谢谢！我使用以下代码：

install.packages("extrafont")
library(extrafont)
font_import() # Prepare for this to take several minutes
loadfonts(device = "win")

ggplot(df, aes(x, y)) + geom_point() +
   theme_bw() +
   annotate("text", x = 0.5, y = 0.7, label = "2016 ?", 
   size = 7, hjust = 0, colour = "grey50", family = "Calibri", fontface = "bold")