悬停时突出显示组中的所有值

Question

假设数据

library(ggplot2)
library(plotly)

set.seed(357)
xy <- data.frame(letters = rep(c("a", "b", "c"), times = 3),
                 values = runif(9),
                 groups = rep(c("group1", "group2", "group3"), each = 3))

  letters    values groups
1       a 0.9913409 group1
2       b 0.6245529 group1
3       c 0.5245744 group1
4       a 0.4601817 group2
5       b 0.2254525 group2
6       c 0.5898001 group2
7       a 0.1716801 group3
8       b 0.3195294 group3
9       c 0.8953055 group3

ggplotly(
  ggplot(xy, aes(x = letters, y = values, group = groups)) +
  theme_bw() +
  geom_point()
)

我的目标是在悬停时突出显示属于同一组的所有点。例如。将鼠标悬停在右上角的点上时，该组（圆圈）中的所有点都会变成红色。使用layout(hovermode = "x") 可以实现类似的效果，但前提是您有兴趣突出显示其中一个轴上的所有点。除了x、y 或closest（hovermode 的模式）之外，我希望自定义变量具有相同的行为。

Answer 1

这可能会满足您的需求

样本数据

set.seed(357)
xy <- data.frame(letters = rep(c("a", "b", "c"), times = 3),
                 values = runif(9),
                 groups = rep(c("group1", "group2", "group3"), each = 3))

绘图

#create a SharedData object for use in the ggplot below, group by 'groups' 
d <- highlight_key(xy, ~groups )

#create a normal ggplot to fit your needs, but use the SharedData object as data for the chart
p <- ggplot( d, aes(x = letters, y = values, group = groups)) + theme_bw() + geom_point()

#now ggplotly the newly created ggplot, and add text for the tooltips as needed
gg <- ggplotly( p, tooltip = "groups" )

#set the highlight-options to your liking, and plot...
highlight( gg, on = "plotly_hover", off = "plotly_deselect", color = "red" )

绘制结果