对齐单个ggrepel标签内的文本行

Question

我有一个图，其中用多行ggrepel标签标记元素。我想在其中一些中右对齐，在其他一些中左对齐。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"))

如果我使用ggplot2批注进行此操作，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)

如何使用ggrepel标签实现这一目标？

谢谢！

Answer 1

ggrepel（版本0.8.1.9000）的开发版本中已经解决了此问题。

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"))