如何在geom_text_repel或gomplot的geom_text标签中包含斜体文本？ [英] How do I include italic text in geom_text_repel or geom_text labels for ggplot?

问题描述

是否可以将部分斜体文本标签传递给ggplot？我试过使用表达式和斜体命令（表达式（paste（italic（some文本）））），但这些不能传递到数据框中，因为这些命令的结果不是原子的。设置参数 fontface =italic也不够，因为这会斜体化整个标签，而不仅仅是标签中的一组选定字符。例如，我希望一些必须用斜体表示的拉丁语短语在标签中加以斜体（例如in vivo point中的in vivo）。

Is it possible to pass partially italicized text labels into ggplot? I have tried using the expression and italic commands (expression(paste(italic("some text")))), but these cannot be passed into a data frame because the result of the commands is not atomic. Setting the parameter fontface = "italic" also doesn't suffice, since this italicizes the entire label, rather than just a select set of characters in the label. For instance, I would like some necessarily italicized Latin phrases to be italicized in a label (such as "in vivo" in "in vivo point").

library(ggplot)
library(ggrepel)

df <- data.frame(V1 = c(1,2), V2 = c(2,4), V3 = c("in vivo point","another point"))

ggplot(data = df, aes(x = V1, y = V2)) + geom_point() + geom_text_repel(aes(label = V3))

推荐答案

code> parse = TRUE 将？plotmath 表达式（作为字符串）传递给 geom_text 或 geom_text_repel 。您必须将这些字符串重写为plotmath，但如果它不是太多，那就不算太坏。

You can use parse = TRUE to pass ?plotmath expressions (as strings) to geom_text or geom_text_repel. You'll have to rewrite the strings as plotmath, but if it's not too many it's not too bad.

注意： CRAN版本的 ggrepel 有一个缺陷 parse = TRUE ，但它已在GitHub版本中修复。 ggplot2 :: geom_text 正常工作。
$ b

Note: The CRAN version of ggrepel has a bug that breaks parse = TRUE, but it has been fixed on the GitHub version. ggplot2::geom_text works fine.

# devtools::install_github('slowkow/ggrepel')

df <- data.frame(V1 = c(1,2), V2 = c(2,4), 
                 V3 = c("italic('in vivo')~point", "another~point"))

ggplot(data = df, aes(x = V1, y = V2, label = V3)) + 
    geom_point() + 
    geom_text_repel(parse = TRUE)

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