将Unicode字符保存到R中的.pdf

问题描述：

我想使用 ggsave 将特定的unicode字符保存到pdf文件中.

I would like to save specific unicode characters to a pdf file with ggsave.

示例代码

library(ggplot2)

ggplot() +
  geom_point(data = data.frame(x=1, y=1), aes(x,y), shape = "\u2191") +
  geom_point(data = data.frame(x=2, y=2), aes(x,y), shape = "\u2020")

ggsave("test.pdf", plot = last_plot()), width = 40, height = 40, units = "mm")

但是，当保存 .pdf 时，unicode字符将转换为三个点...

However, when saving the .pdf the unicode characters are transformed to three dots...

尝试对其进行修复

我尝试在 ggsave ->中使用 cairo_pdf 设备.没用.
使用此帖子绘制unicode字符，但不太理解它...

I tried to use the cairo_pdf device in ggsave -> didn't work.
Used this post to plot the unicode characters, but didn't quite understand it...

问题

如何在pdf中同时使用两个unicode字符?

How do I use both unicode characters in a pdf?

> sessionInfo()
R version 3.6.2
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Catalina 10.15.5

答

这似乎在我的Mac上有效:

This seems to work on my mac:

library(tidyverse)

quartz(type = 'pdf', file = 'test.pdf')

ggplot() +
    geom_point(data = data.frame(x=1, y=1), aes(x,y), shape = "\u2191") +
    geom_point(data = data.frame(x=2, y=2), aes(x,y), shape = "\u2020")

使用此处的建议: https://stackoverflow.com/a/44548861/1827

将Unicode字符保存到R中的.pdf

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