parcoord PKG: double-click an axis name does not reorder tick values (mtcars cyl axis)

[sfd99]

Hi Kenton!

Your Intro to ‘parcoords’
article (and the pkg itself),
is great!.

I noticed the following bug(?)
in the mtcars display:

If I select (for ex.),
the Porsche 914-2 model,
it correctly displays: 4 in the cyl axis.

But if the user wants to reorder that cyl axis
and double-clicks
on the axis name:
cyl ,
the line will now show (incorrectly)
the value: 8 in the cyl axis!.
But the Porsche has 4 cylinders,
not 8...

In other words:
the Porsche orange line has moved
but the axis tick values (4,6,8),
have not been reordered!.

The value 4
is still at the bottom of the cyl axis
and 8 is still at the top,
after reordering the cyl axis.

This will happen for either:
reorderable = FALSE or TRUE...

Here's the Code to reproduce:

start of R code

library(shiny)
library(parcoords)
library(d3r)

ui <- fluidPage(
    sidebarLayout(
        sidebarPanel(
           
        ),
       
        mainPanel(
            parcoordsOutput("par_plot")
        )
    )
)

server <- function(input, output) {
   
    output$par_plot<- renderParcoords({
        data(mtcars)
        parcoords(mtcars, rownames = TRUE, brushMode = "1d-axes-multi",   reorderable = FALSE,
                  alphaOnBrushed = 0.15,
                  color = list(
                      colorBy = "cyl",
                      colorScale = "scaleOrdinal",
                      colorScheme = "schemeCategory10"
                  ),
                  withD3 = TRUE)
    })
}

shinyApp(ui = ui, server = server)

** end of R code **

Help, Kenton!

RAY
San Francisco
Rstudio, R - latest versions
Ubuntu Linux 20.04
parcoords PKG 1.0.0

[timelyportfolio]

Thanks @sfd99 for the kind words and well-explained issue. So sorry for the slow response. I will start to research. Can you confirm whether the below outside of Shiny works or not?

        data(mtcars)
        parcoords(mtcars, rownames = TRUE, brushMode = "1d-axes-multi",   reorderable = FALSE,
                  alphaOnBrushed = 0.15,
                  color = list(
                      colorBy = "cyl",
                      colorScale = "scaleOrdinal",
                      colorScheme = "schemeCategory10"
                  ),
                  withD3 = TRUE)

I believe non-Shiny works on my machine, but I might be overlooking something.

I see an error in the JavaScript console, but the error seems to only prevent correct reversal of the axis when in Shiny context.

[sfd99]

Hi Kenton -

Great to interact with you again!.

Ok,

• the Shiny version (my code, above),
  shows the old problem.
• the NON-Shiny version (your code, above),
  shows NO problem!.
  Works perfectly!.
  ie:
  the 4,6,8 vertical axis tick values
  get rearranged if you double-click on CYL (as expected).

So,
seems to be a SHINY problem...

btw:
the reason I prefer to use the SHINY version (my code above),
is that sometimes any non-SHINY version,
will not show in my Rstudio [Viewer] tab.

The Viewer will sometimes only show
an empty, white display.
That blank, empty Viewer problem also happens
with plots of some other PKGS,
so it's not exclusive to parcoord. :-)
It's a different Rstudio-bound problem.

Anyhoo,
that's why I prefer to use
the SHINY version of parcoord always.

Hope this helps, Kenton...
RAY
San Francisco
Rstudio, R - latest versions
Ubuntu Linux 20.04
parcoords PKG 1.0.0