R: Add additional panes to leaflet map to control layer order

addMapPane {leaflet} | R Documentation

## Add additional panes to leaflet map to control layer order

### Description

map panes can be created by supplying a name and a zIndex to control layer ordering. We recommend a `zIndex` value between 400 (the default overlay pane) and 500 (the default shadow pane). You can then use this pane to render overlays (points, lines, polygons) by setting the `pane` argument in `leafletOptions`. This will give you control over the order of the layers, e.g. points always on top of polygons. If two layers are provided to the same pane, overlay will be determined by order of adding. See examples below. See http://www.leafletjs.com/reference-1.3.0.html#map-pane for details.

If the error "Cannot read property 'appendChild' of undefined" occurs, make sure the pane being used for used for display has already been added to the map.

### Usage

    addMapPane(map, name, zIndex)

### Arguments

`map` | A `leaflet` or `mapview` object.
`name` | The name of the new pane (refer to this in `leafletOptions`.
`zIndex` | The zIndex of the pane. Panes with higher index are rendered above panes with lower indices.

### Examples

    rand_lng <- function(n = 10) rnorm(n, -93.65, .01)
    rand_lat <- function(n = 10) rnorm(n, 42.0285, .01)

    random_data <- data.frame(
      lng = rand_lng(50),
      lat = rand_lat(50),
      radius = runif(50, 50, 150),
      circleId = paste0("circle #", 1:50),
      lineId = paste0("circle #", 1:50)
    )

    # display circles (zIndex: 420) above the lines (zIndex: 410), even when added first
    leaflet() %>%
      addTiles() %>%
      # move the center to Snedecor Hall
      setView(-93.65, 42.0285, zoom = 14) %>%
      addMapPane("ames_lines", zIndex = 410) %>% # shown below ames_circles
      addMapPane("ames_circles", zIndex = 420) %>% # shown above ames_lines
      # points above polygons
      addCircles(
        data = random_data, ~lng, ~lat, radius = ~radius, popup = ~circleId,
        options = pathOptions(pane = "ames_circles")
      ) %>%
      # lines in 'ames_lines' pane
      addPolylines(
        data = random_data, ~lng, ~lat, color = "#F00", weight = 20,
        options = pathOptions(pane = "ames_lines")
      )

    # same example but circles (zIndex: 420) are below the lines (zIndex: 430)
    leaflet() %>%
      addTiles() %>%
      # move the center to Snedecor Hall
      setView(-93.65, 42.0285, zoom = 14) %>%
      addMapPane("ames_lines", zIndex = 430) %>% # shown below ames_circles
      addMapPane("ames_circles", zIndex = 420) %>% # shown above ames_lines
      # points above polygons
      addCircles(
        data = random_data, ~lng, ~lat, radius = ~radius, popup = ~circleId,
        options = pathOptions(pane = "ames_circles")
      ) %>%
      # lines in 'ames_lines' pane
      addPolylines(
        data = random_data, ~lng, ~lat, color = "#F00", weight = 20,
        options = pathOptions(pane = "ames_lines")
      )

[Package leaflet version 2.0.2 Index]