r - 在单个 ggrepel 标签中对齐文本行

Question

我有一个情节，我用多行ggrepel标签标记元素。我想在其中一些中右对齐并在其他中左对齐。参见示例：

p <- ggplot() +
  coord_cartesian(xlim=c(0,1), ylim=c(0,1)) +
  theme_void()
p

labelInfo <- data.frame(x=c(0.45,0.55), y=c(0.5,0.5), 
                        g=c("I'd like very much to be\nright justified","And I'd like to be\nleft justified"))

p + geom_label_repel(data=labelInfo, aes(x,y,label=g), 
                     box.padding = 0.5, point.padding = 0.75, 
                     nudge_x = c(-0.05,0.05), nudge_y = 0, direction="x",
                     arrow=arrow(length=unit(2,"mm"), ends="last", type="closed"))

如果我用ggplot2注释来做这个，我会这样做，这会产生我想要的左/右对齐方式：

p + annotate("text", label="I'd like very much to be\nright justified", x=0.45, y=0.5, hjust=1) +
  annotate("text", label="And I'd like to be\nleft justified", x=0.55, y=0.5, hjust=0)

如何通过ggrepel标签实现这一目标？

谢谢！

Answer 1

现在已经在ggrepel（版本 0.8.1.9000）的开发版本中解决了这个问题。

library(ggplot2)
devtools::install_github("slowkow/ggrepel") 

p <- ggplot() +
  coord_cartesian(xlim=c(0,1), ylim=c(0,1)) +
  theme_void()
p

labelInfo <- data.frame(x=c(0.45,0.55), y=c(0.5,0.5), 
                        g=c("I'd like very much to be\nright justified","And I'd like to be\nleft justified"))

p + geom_label_repel(data=labelInfo, aes(x,y,label=g), hjust=c(1,0),
                     box.padding = 0.5, point.padding = 0.75, 
                     nudge_x = c(-0.05,0.05), nudge_y = 0, direction="x",
                     arrow=arrow(length=unit(2,"mm"), ends="last", type="closed"))