geom_line_interactive wrong labels with few data points

[tvroylandt]

Hi,

Thanks for this package @davidgohel !

Trying to do some slopecharts between two dates, I noticed that geom_line_interactive produce some issue when your line is only made of 2 or 3 points.

Reproducible example below:

library(tidyverse)
library(ggiraph)

# this one is fine
iris_plot_ok <- ggplot(
  iris,
  aes(
    x = Sepal.Length,
    y = Sepal.Width,
    color = Species,
    tooltip = Species,
    data_id = Species
  )
) +
  geom_line_interactive(linewidth = 1)

girafe(ggobj = iris_plot_ok)

# this one is not
iris_plot_not_ok <- ggplot(
  iris |>
    group_by(Species) |>
    slice(1:2) |>
    ungroup(),
  aes(
    x = Sepal.Length,
    y = Sepal.Width,
    color = Species,
    tooltip = Species,
    data_id = Species
  )
) +
  geom_line_interactive(linewidth = 1)

girafe(ggobj = iris_plot_not_ok)

In the first case, everything is fine.
In the second one, the tooltip is wrong. It's mixed or produced NA. Adding group = Species doesn't change anything

My current solution is to produce all points behind this one with y = ax+b and use geom_point_interactive with transparent settings. Not really optimal

[sstein93]

Thanks for this awesome package @davidgohel! It's overall been really useful!

I was wondering if there is an update on this issue? I am experiencing the same thing. What's interesting is this bug seems to depend on the number of points on the x-axis.

In the example below with only 2 points on the x-axis:

test <- data.frame(x = c(rep(1, 8), rep(2, 8), rep(3,8), rep(4, 8)), 
                   y = rep(1:8, 4), 
                   id = rep(str_split("abcdefgh","") %>% unlist(),4)) 
ptest <- ggplot2::ggplot(test %>% dplyr::filter(x <=2), 
                     aes(x = x, y = y, color = id, group = id)) +
  ggiraph::geom_point_interactive(aes(data_id = id, tooltip = id)) +
  ggiraph::geom_line_interactive(aes(data_id = id, tooltip = id)) 

• The first line (red) is mapped correctly to data_id = "a"
• The second line (yellow) is mapped incorrectly to data_id = "c" instead of "b". I.e., data_id index + 1
• The third line (light green) is mapped to incorrectly to data_id "e" instead of "c", i.e., data_id index + 2
• The fourth line (dark green) is mapped to data id "g" instead of "d", i.e. data_id index + 3
• Line 5-8 are being mapped to data id "NA" since I think they would be mapped to idx +4, +5, +6, +7 if they existed.

If I instead have 3 points on the x-axis, the bug changes a little where:

• the first two line (a and b) are mapped correctly
• The 3rd and 4th lines are each mapped to idx + 1 (i.e. c -> d, and d -> e)
• The 5th and 6th lines are each mapped to idx + 2 (i.e. e -> g, and f -> h)

test <- data.frame(x = c(rep(1, 8), rep(2, 8), rep(3,8), rep(4, 8)), 
                   y = rep(1:8, 4), 
                   id = rep(str_split("abcdefgh","") %>% unlist(),4)) 
ptest <- ggplot2::ggplot(test %>% dplyr::filter(x <=3), 
                     aes(x = x, y = y, color = id, group = id)) +
  ggiraph::geom_point_interactive(aes(data_id = id, tooltip = id)) +
  ggiraph::geom_line_interactive(aes(data_id = id, tooltip = id))

If I instead have 4 points on the x-axis, the bug changes to:

• First 3 lines are mapped correctly (a ,b ,c)
• Lines 4-6 are mapped to data id index + 1 (d->e, e->f, f->g)
• Lines 7 and 8 are mapped to NA but would likely be data id index + 2 if they existed in the data

test <- data.frame(x = c(rep(1, 8), rep(2, 8), rep(3,8), rep(4, 8)), 
                   y = rep(1:8, 4), 
                   id = rep(str_split("abcdefgh","") %>% unlist(),4)) 
ptest <- ggplot2::ggplot(test %>% dplyr::filter(x <=4), 
                     aes(x = x, y = y, color = id, group = id)) +
  ggiraph::geom_point_interactive(aes(data_id = id, tooltip = id)) +
  ggiraph::geom_line_interactive(aes(data_id = id, tooltip = id)) 

Thanks again for all of the work you have put into this package!
Shayna

[crystalluckett-sanofi]

@davidgohel is there any update on this? I am also having this issue.