Create an interactive flow map

Creates an interactive flow map visualizing flows between various locations and outputs it as an HTML widget. This function utilizes the FlowmapBlue library to create maps with customizable options such as clustering, animation, and dark mode. The widget can be rendered in R Markdown, Shiny, or viewed in a browser. It can also be saved to html file with htmlwidgets:saveWidget(). See examples for more details.

Usage

flowmapblue(
  locations,
  flows,
  mapboxAccessToken = NULL,
  clustering = TRUE,
  animation = FALSE,
  darkMode = FALSE
)

Arguments

locations

A data.frame containing the location data. The data.frame should have the following columns:

id

A character vector representing the unique identifier for each location (e.g., "JU", "LU").

name

(Optional) A character vector representing the name of each location (e.g., "Jura", "Luzern").

lat

A numeric vector representing the latitude of each location in WGS84 (EPSG: 4326) coordinate reference system.

lon

A numeric vector representing the longitude of each location in WGS84 (EPSG: 4326) coordinate reference system.

flows

A data.frame containing the flow data between locations. The data.frame should have the following columns:

origin

A character vector representing the origin location identifier (must match the id in locations).

dest

A character vector representing the destination location identifier (must match the id in locations).

count

An integer vector representing the flow count between the origin and destination locations.

time

(Optional) A vector of POSIXct or Date objects representing the date or date and time of the flow.

mapboxAccessToken

A character string representing the Mapbox access token. This is required to render the map using Mapbox tiles. You can obtain a free token at https://account.mapbox.com/.

clustering

A logical value indicating whether to enable clustering of locations on the map. Defaults to TRUE.

animation

A logical value indicating whether to enable animation of flows on the map. Defaults to FALSE.

darkMode

A logical value indicating whether to enable dark mode for the map. Defaults to FALSE.

Value

An HTML widget of class flowmapblue and htmlwidget that can be rendered in R Markdown, Shiny, or viewed in a browser. It can also be saved to html file with htmlwidgets:saveWidget(). See examples for more details.

Examples

if (FALSE) { # \dontrun{
# example 1, normal flows
# set your Mapbox access token
Sys.setenv(MAPBOX_API_TOKEN = "YOUR_MAPBOX_ACCESS_TOKEN")

# load locations and flows for Switzerland
locations <- data(ch_locations)
flows <- data(ch_flows)

flowmap <- flowmapblue(
 locations,
 flows,
 mapboxAccessToken = Sys.getenv('MAPBOX_API_TOKEN'),
 clustering = TRUE,
 darkMode = TRUE,
 animation = FALSE
)

# view the map
flowmap

# or save it as an HTML file
htmlwidgets::saveWidget(flowmap, file = "flowmap.html")

# example 2, flows with date in time column
# set your Mapbox access token
Sys.setenv(MAPBOX_API_TOKEN = "YOUR_MAPBOX_ACCESS_TOKEN")

# load locations and flows for Switzerland
data(ch_locations)
data(ch_flows)

# generate fake datetime
flows$time <- seq(from =as.POSIXct("2020-01-01"),
  to = as.POSIXct("2020-01-05"), length.out = nrow(flows))

flowmap <- flowmapblue(
 ch_locations,
 ch_flows,
 mapboxAccessToken = Sys.getenv('MAPBOX_API_TOKEN'),
 clustering = TRUE,
 darkMode = TRUE,
 animation = FALSE
)

# view the map
flowmap

# example 3, flows with date in time column
# set your Mapbox access token
Sys.setenv(MAPBOX_API_TOKEN = "YOUR_MAPBOX_ACCESS_TOKEN")

# load locations and flows for Switzerland
data(ch_locations)
data(ch_flows)
# generate fake dates
flows$time <- seq(from = as.Date("2020-01-01"),
  to = as.Date("2020-06-01"), length.out = nrow(flows))

flowmap <- flowmapblue(
 ch_locations,
 ch_flows,
 mapboxAccessToken = Sys.getenv('MAPBOX_API_TOKEN'),
 clustering = TRUE,
 darkMode = TRUE,
 animation = FALSE
)

# view the map
flowmap
} # }