格式化长文本标签的工具提示

Question

考虑下面的简单示例。有没有办法格式化绘图工具提示，使得长文本标签在框中可见，而不是这个切断值的荒谬矩形？

library(ggplot2); library(plotly)

df <- data.frame(x = 1:10, y = 1:10, z = rep("the longggggggggggggggggggggggggggggestttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt labelllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll you can imagineeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee", 10))

p <- ggplot(df, aes(x,y,label=z)) + geom_point()
ggplotly(p, tooltip = "label")

Answer 1

我很确定，某个地方存在更优雅的解决方案。我可以建议你像每个n角色一样休息。 https://stackoverflow.com/a/2352006/9300556有一个很好的解决方法：

gsub('(.{1,90})(\\s|$)', '\\1\n', s)

它会将字符串“s”分成最多90个字符的行（不包括换行符“\ n”，但包括字间空格），除非有一个字本身超过90个字符，那么该字本身将占用一个整体线。

所以我们只需要将gsub()添加到ggplot美学中：

p <- ggplot(df, aes(x,y,
            text = gsub('(.{1,20})(\\s|$)', '\\1\n', z))) +
  geom_point()

ggplotly(p, tooltip = "text")

UPDATE

这是@Rich Pauloo评论中更优雅的解决方案。在这种情况下，你的字符串也将大部分被填充（但实际上是自动对齐的）。但是，填充取决于绘图分辨率和标签位置。

library(stringr)

p <- ggplot(df,
            aes(x, y,
                text = stringr::str_wrap(
                  string = z,
                  width = 20,
                  indent = 1, # let's add extra space from the margins
                  exdent = 1  # let's add extra space from the margins
                ))) +
  geom_point()

ggplotly(p, tooltip = "text")