addPolarMarkers: Add polar markers to leaflet map

Description

This function is similar (but not identical to) the leaflet::addMarkers() and leaflet::addCircleMarkers() functions in leaflet, which allows users to add openair directional analysis plots to any leaflet map and have more control over groups and layerIds than in "all-in-one" functions like polarMap().

Usage

addPolarMarkers(
  map,
  pollutant,
  fun = openair::polarPlot,
  lng = NULL,
  lat = NULL,
  layerId = NULL,
  group = NULL,
  popup = NULL,
  popupOptions = NULL,
  label = NULL,
  labelOptions = NULL,
  options = leaflet::markerOptions(),
  clusterOptions = NULL,
  clusterId = NULL,
  key = FALSE,
  d.icon = 200,
  d.fig = 3.5,
  data = leaflet::getMapData(map),
  ...
)
addPolarDiffMarkers(
  map,
  pollutant,
  before = leaflet::getMapData(map),
  after = leaflet::getMapData(map),
  lng = NULL,
  lat = NULL,
  layerId = NULL,
  group = NULL,
  popup = NULL,
  popupOptions = NULL,
  label = NULL,
  labelOptions = NULL,
  options = leaflet::markerOptions(),
  clusterOptions = NULL,
  clusterId = NULL,
  key = FALSE,
  d.icon = 200,
  d.fig = 3.5,
  ...
)

Value

A leaflet object.

Arguments

map: a map widget object created from leaflet()
pollutant: The name of the pollutant to be plot. Note that, if fun = openair::windRose, you must set pollutant = "ws".
fun: An openair directional analysis plotting function. Supported functions include openair::polarPlot() (the default), openair::polarAnnulus(), openair::polarFreq(), openair::percentileRose(), openair::pollutionRose() and openair::windRose(). For openair::polarDiff(), use addPolarDiffMarkers().
lng: The decimal longitude.
lat: The decimal latitude.
layerId: the layer id
group: the name of the group the newly created layers should belong to (for clearGroup and addLayersControl purposes). Human-friendly group names are permitted--they need not be short, identifier-style names. Any number of layers and even different types of layers (e.g. markers and polygons) can share the same group name.
popup: A column of data to be used as a popup.
popupOptions: A Vector of popupOptions to provide popups
label: A column of data to be used as a label.
labelOptions: A Vector of labelOptions to provide label options for each label. Default NULL
options: a list of extra options for tile layers, popups, paths (circles, rectangles, polygons, ...), or other map elements
clusterOptions: if not NULL, markers will be clustered using Leaflet.markercluster; you can use markerClusterOptions() to specify marker cluster options
clusterId: the id for the marker cluster layer
key: Should a key for each marker be drawn? Default is FALSE.
d.icon: The diameter of the plot on the map in pixels. This will affect the size of the individual polar markers. Alternatively, a vector in the form c(width, height) can be provided if a non-circular marker is desired.
d.fig: The diameter of the plots to be produced using openair in inches. This will affect the resolution of the markers on the map. Alternatively, a vector in the form c(width, height) can be provided if a non-circular marker is desired.
data: A data frame. The data frame must contain the data to plot your choice of openair directional analysis plot, which includes wind speed (ws), wind direction (wd), and the column representing the concentration of a pollutant. In addition, data must include a decimal latitude and longitude. By default, it is the data object provided to leaflet::leaflet() initially, but can be overridden.
...: Other arguments for the plotting function (e.g. period for openair::polarAnnulus()).
before, after: A data frame that represents the before/after case. See openair::polarPlot() for details of different input requirements. By default, both before and after are the data object provided to leaflet::leaflet() initially, but at least one should be overridden.

Functions

addPolarMarkers(): Add any one-table polar marker (e.g., openair::polarPlot())
addPolarDiffMarkers(): Add the two-table openair::polarDiff() marker.

Examples

Run this code

if (FALSE) {
library(leaflet)
library(openair)

# different types of polar plot on one map
leaflet(data = polar_data) %>%
  addTiles() %>%
  addPolarMarkers("ws",
    fun = openair::windRose,
    group = "Wind Rose"
  ) %>%
  addPolarMarkers("nox",
    fun = openair::polarPlot,
    group = "Polar Plot"
  ) %>%
  addLayersControl(
    baseGroups = c("Wind Rose", "Polar Plot")
  )

# use of polar diff (NB: both 'before' and 'after' inherit from `leaflet()`,
# so at least one should be overridden - in this case 'after')
leaflet(data = polar_data) %>%
  addTiles() %>%
  addPolarDiffMarkers("nox",
    after = dplyr::mutate(polar_data, nox = jitter(nox, 5))
  )
}

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