Mapping specific colors to specific values of 'colorBy'

[processir]

Hello,

I'd like to be able to specify colors for specific values of the colorBy variable. Is this possible? I understand that you can specify the variable to color with colorBy = variable. But could you pass for e.g. a named vector where the name is the unique value in the variable and the value is the color? This is commonly done in other plotting packages to enforce colors for specific values.

[timelyportfolio]

@processir sorry I missed this. Good question, and I see how this can be difficult, since there are no good examples or documentation. Here is a quick example, but unfortunately this does not work as intended. I'll try to get a fix by this weekend.

library(parcoords)

parcoords(
  mtcars,
  color = list(
    colorBy = "cyl",
    colorScale = "scaleOrdinal",
    colorScheme = c("purple","blue","green"),
    colorDomain = c(4,6,8)
  ),
  withD3 = TRUE
)

[timelyportfolio]

@processir I made a change that I think will allow us to specify domain as you suggest. Please run same example from above and the cyl == 4 should show as purple.

[processir]

Hey @timelyportfolio , thanks for your help. Your example seems to work on my end. However, I noticed that the brushMode using 1d-axes-multi does not work with this example while 1d-axes does when the reorderable = TRUE parameter is set. Do you know if there is a quick fix to this?

# works
parcoords(
  mtcars,
  brushMode = "1D-axes",
  reorderable = TRUE,
  color = list(
    colorBy = "cyl",
    colorScale = "scaleOrdinal",
    colorScheme = c("purple","blue","green"),
    colorDomain = c(4,6,8)
  ),
  withD3 = TRUE
)

# does not work
parcoords(
  mtcars,
  brushMode = "1D-axes-multi",
  reorderable = TRUE,
  color = list(
    colorBy = "cyl",
    colorScale = "scaleOrdinal",
    colorScheme = c("purple","blue","green"),
    colorDomain = c(4,6,8)
  ),
  withD3 = TRUE
)

[timelyportfolio]

@processir Glad the color fix worked. 1d-multi-axes is same issue as #45. I tried to quickly patch last night when working on color but did not work. Unfortunately this is a more complicated issue requiring changes to underlying library. I hope to fix by year end.

[jtr13]

This is really helpful... thanks! Both examples (brushMode = "1D-axes" and brushMode = "1D-axes-multi") work with color for me.