SpatialLines with MultiLines are not all shown

[edzer]

Try:

library(trajectories)
data(storms)
x = as(storms, "SpatialLinesDataFrame")
plot(x)
library(mapview)
mapview(x)

it seems that only the first Line of a Lines object is plotted.

[fdetsch]

The problem is obviously related with addPolylines from leaflet that seemingly drops all but the first continuous sub-line in an otherwise discontinuous (i.e., segmented) line. For example,

leaflet(x) %>% addTiles() %>% addPolylines()

behaves similar to mapview(x). I implemented a temporary workaround to display all line segments regardless of whether or not the line is broken. Edzer, since I assume you are familiar with the storms dataset, could you please compile the latest version of the 'devel' branch (1.0.11) and evaluate if the output of mapview(x), particularly the pop-up assignment, now looks correct? Please note that this currently works with burst = FALSE only.

[edzer]

Thanks! For SpatialLinesDataFrame it now works, for SpatialLines it doesn't. Shall I write an issue for leaflet?

[fdetsch]

It shouldn't cost too much effort to transfer this approach to SpatialLines. Since the problem arises from addPolylines, however, I think that it would be desirable if this could be handled from the leaflet side in the long run (not least because there are far more leaflet users out there).

[edzer]

It's already there: rstudio/leaflet#213

[fdetsch]

Just for the record, mapview support for SpatialLines is now enabled as well.