将数据添加到输入数据集中包含但不直接在vis中的ggvis工具提示

Question

这是我的输入数据集:

> names(breakingbad.episodes)
[1] "season"           "episode"          "epnum"            "epid"             "title"           
[6] "url.trakt"        "firstaired.utc"   "id.tvdb"          "rating"           "votes"           
[11] "loved"            "hated"            "overview"         "firstaired.posix" "year"            
[16] "zrating.season"   "src"     

对于我ggvis,我用下面的变量firstaired.posix和rating:

> str(breakingbad.episodes[c("firstaired.posix", "rating")])
'data.frame':   62 obs. of  2 variables:
$ firstaired.posix: POSIXct, format: "2008-01-21 02:00:00" "2008-01-28 02:00:00" "2008-02-  11 02:00:00" ...
$ rating          : num  87 85 84 84 83 90 87 85 88 83 ...

我ggvis使用包含以下rating信息的工具提示成功创建了我:

> breakingbad.episodes %>% 
ggvis(x = ~firstaired.posix, 
    y = ~rating, 
    fill = ~season) %>% 
layer_points() %>%
add_axis("x", title = "Airdate") %>%
add_axis("y", title = "Rating") %>%
add_legend("fill", title = "Season") %>%
add_tooltip(function(data){paste0("Rating: ", data$rating)}, "hover")

但我实际上希望工具提示包含更多数据,比如epid变量,所以我试过:

…
add_tooltip(function(data){paste0("Rating: ", data$rating, "\n", "Epid: ", as.character(data$epid))}, "hover")

...使用as.character()因果epid是有序因子 - 但工具提示的部分是空的.(我也注意到我打算\n插入的换行符丢失,但这是一个不同的问题).

看起来这个问题的原因是vis通过管道我的数据集创建的对象ggvis不包含我想要显示的信息,至少这是我通过查看str()第一个示例的输出收集的原因.

编辑:我解决了这个换行问题,所以没有必要指出我?add_tooltip- 完全忘了这一点.

编辑:接受的答案工作正常,即使它不允许我在工具提示中放置任意变量,它几乎是我的用例需要的,谢谢!这是我最后做的事情:

breakingbad.episodes <- transform(breakingbad.episodes, id = paste0(epid, " - ", title))

breakingbad.episodes %>% 
  ggvis(x = ~firstaired.posix, 
      y = ~rating, 
      fill = ~season, 
      key := ~id) %>% 
  layer_points() %>%
  add_axis("x", title = "Airdate") %>%
  add_axis("y", title = "Rating") %>%
  add_legend("fill", title = "Season") %>%
  add_tooltip(all_values, "click")

Answer 1

是的,这是可能的.通常,客户端仅发回实际在图中的数据列.要获取其他列,您应该使用键来索引原始数据:这是一个简单的可重现示例

library(ggvis)
mtc <- mtcars
mtc$id <- 1:nrow(mtc)

all_values <- function(x) {
  if(is.null(x)) return(NULL)
  row <- mtc[mtc$id == x$id, ]
  paste0(names(row), ": ", format(row), collapse = "<br />")
}

mtc %>% ggvis(x = ~wt, y = ~mpg, key := ~id) %>%
  layer_points() %>%
  add_tooltip(all_values, "hover")