Package {DonutMap}

Title: Donut Maps with 'sf', 'ggplot2', and 'leaflet'
Version: 0.1.0
Description: Create donut charts positioned on maps from tidy data. The package provides helpers to compute donut polygon geometries, optional origin-destination flow lines, ready-to-use 'ggplot2' map layers, and interactive 'leaflet' widgets.
License: MIT + file LICENSE
Encoding: UTF-8
Language: en-US
RoxygenNote: 7.3.3
Depends: R (≥ 4.1.0)
Imports: dplyr, ggplot2, htmltools, leaflet, rlang, scales, sf, tibble
Suggests: ragg, knitr, rmarkdown, rnaturalearth, rnaturalearthdata, testthat (≥ 3.0.0)
Config/testthat/edition: 3
VignetteBuilder: knitr
URL: https://aureliennicosiaulaval.github.io/DonutMap/, https://github.com/AurelienNicosiaULaval/DonutMap
BugReports: https://github.com/AurelienNicosiaULaval/DonutMap/issues
Config/Needs/website: pkgdown
NeedsCompilation: no
Packaged: 2026-06-01 18:11:05 UTC; aureliennicosia
Author: Aurélien Nicosia [aut, cre]
Maintainer: Aurélien Nicosia <aurelien.nicosia@mat.ulaval.ca>
Repository: CRAN
Date/Publication: 2026-06-08 14:40:02 UTC

DonutMap: donut maps with sf and ggplot2

Description

DonutMap creates donut charts positioned on a map from tidy data. The main static entry point is donut_map(). The main interactive entry point is donut_leaflet(). Use donut_polygons() when you need the sf polygon layer directly, and flow_lines() when you need origin-destination line or trajectory geometries.

Author(s)

Maintainer: Aurélien Nicosia aurelien.nicosia@mat.ulaval.ca

See Also

Useful links:

Draw an interactive donut map

Description

donut_leaflet() returns a leaflet htmlwidget with clickable donut segments, optional origin-destination links or curved trajectories, popups, labels, a legend, and layer controls.

Usage

donut_leaflet(
  data,
  id,
  category,
  value,
  map = NULL,
  lon = NULL,
  lat = NULL,
  input_crs = 4326,
  crs = 3857,
  radius_range = NULL,
  inner_radius = 0.55,
  n = 96,
  colours = NULL,
  flows = NULL,
  from = NULL,
  to = NULL,
  flow_value = NULL,
  flow_group = NULL,
  flow_min = NULL,
  flow_weight_range = c(1, 8),
  flow_curvature = 0.18,
  flow_n = 30,
  flow_arrow = TRUE,
  flow_arrow_size = NULL,
  flow_colour = "grey35",
  flow_colours = NULL,
  flow_legend = TRUE,
  flow_legend_position = "topright",
  flow_opacity = 0.55,
  provider_tiles = "CartoDB.Positron",
  popup = TRUE,
  label = TRUE,
  prefer_canvas = FALSE,
  map_fill = "#f3f4f6",
  map_colour = "#ffffff",
  map_weight = 1,
  map_opacity = 0.9,
  donut_colour = "#ffffff",
  donut_weight = 1,
  donut_opacity = 0.9,
  donut_smooth_factor = 0
)

Arguments

data

A data frame or sf object. Each row is one category for one donut location.

id

Unquoted column identifying each donut location.

category

Unquoted column identifying donut categories.

value

Unquoted numeric column giving non-negative category values.

map

Optional sf object used as a background layer.

lon, lat

Unquoted longitude and latitude columns. Required when data is not an sf object.

input_crs

Coordinate reference system for lon and lat, or for an sf object with missing CRS. Defaults to EPSG:4326.

crs

Target projected CRS used to build interactive donut and trajectory geometries. Defaults to EPSG:3857, Leaflet's default display projection, so donut circles and sector separators remain visually regular on screen.

radius_range

Numeric vector of length 2 giving minimum and maximum donut radii in map units. If NULL, a range is derived from the map extent.

inner_radius

Numeric value in ⁠(0, 1)⁠ giving the inner radius as a proportion of the outer radius.

n

Number of points used to approximate a complete outer circle.

colours

Optional category colours. Use a named vector for stable category-colour matching.

flows

Optional data frame of origin-destination flows.

from, to

Unquoted columns in flows identifying origin and destination ids. Required when flows is supplied.

flow_value

Optional unquoted numeric column in flows used to scale line widths. If omitted, each flow receives value 1.

flow_group

Optional unquoted column in flows used to colour flow lines and arrowheads by group.

flow_min

Optional minimum flow value to draw.

flow_weight_range

Numeric vector of length 2 controlling interactive flow line weights.

flow_curvature

Numeric curvature for trajectory lines. Use 0 for straight lines, positive values for one bend direction, and negative values for the opposite direction.

flow_n

Number of points used to approximate each curved trajectory.

flow_arrow

Should interactive flow trajectories include arrowheads?

flow_arrow_size

Arrowhead length in projected map units. If NULL, a size is derived from the donut radii.

flow_colour

Flow line colour used when flow_group is not supplied.

flow_colours

Optional colours for flow_group. Use a named vector for stable group-colour matching. If omitted and flow groups match donut categories, colours is reused.

flow_legend

Should a separate flow colour legend be shown when flow_group is supplied?

flow_legend_position

Position of the flow colour legend.

flow_opacity

Flow line opacity.

provider_tiles

Leaflet provider tiles. Use NULL to skip tile layers.

popup

Should popups be attached to donut segments and flow lines?

label

Should hover labels be attached to donut segments and flow lines?

prefer_canvas

Should Leaflet prefer Canvas over SVG for vector rendering? The default FALSE gives crisper small donut separators.

map_fill, map_colour

Background map fill and outline colours.

map_weight

Background map border weight.

map_opacity

Background map opacity.

donut_colour

Donut segment border colour.

donut_weight

Donut segment border weight.

donut_opacity

Donut segment fill opacity.

donut_smooth_factor

Leaflet path simplification factor for donut polygons. The default 0 preserves the donut vertices so arcs and sector separators are not simplified by Leaflet.

Value

A leaflet htmlwidget.

Examples

demo <- data.frame(
  place = rep(c("A", "B", "C"), each = 3),
  lon = rep(c(-71.35, -71.2, -71.05), each = 3),
  lat = rep(c(46.75, 46.82, 46.73), each = 3),
  category = rep(c("x", "y", "z"), times = 3),
  value = c(10, 20, 5, 5, 15, 10, 12, 4, 9)
)

donut_leaflet(demo, place, category, value, lon = lon, lat = lat)

Draw a donut map

Description

donut_map() returns a ggplot2 map with donut charts located on top of an optional sf background map. It can also add origin-destination links or curved trajectories between donut locations.

Usage

donut_map(
  data,
  id,
  category,
  value,
  map = NULL,
  lon = NULL,
  lat = NULL,
  input_crs = 4326,
  crs = NULL,
  radius_range = NULL,
  inner_radius = 0.55,
  n = 96,
  colours = NULL,
  flows = NULL,
  from = NULL,
  to = NULL,
  flow_value = NULL,
  flow_group = NULL,
  flow_colours = NULL,
  flow_min = NULL,
  flow_linewidth_range = c(0.2, 2.5),
  flow_curvature = 0.18,
  flow_n = 30,
  flow_arrow = TRUE,
  flow_arrow_length = 0.12,
  flow_colour = "grey35",
  flow_alpha = 0.45,
  map_fill = "grey96",
  map_colour = "white",
  donut_colour = "white",
  donut_linewidth = 0.15
)

Arguments

data

A data frame or sf object. Each row is one category for one donut location.

id

Unquoted column identifying each donut location.

category

Unquoted column identifying donut categories.

value

Unquoted numeric column giving non-negative category values.

map

Optional sf object used as a background layer.

lon, lat

Unquoted longitude and latitude columns. Required when data is not an sf object.

input_crs

Coordinate reference system for lon and lat, or for an sf object with missing CRS. Defaults to EPSG:4326.

crs

Target projected CRS used to build the map.

radius_range

Numeric vector of length 2 giving minimum and maximum donut radii in map units. If NULL, a range is derived from the map extent.

inner_radius

Numeric value in ⁠(0, 1)⁠ giving the inner radius as a proportion of the outer radius.

n

Number of points used to approximate a complete outer circle.

colours

Optional category colours. Use a named vector for stable category-colour matching.

flows

Optional data frame of origin-destination flows.

from, to

Unquoted columns in flows identifying origin and destination ids. Required when flows is supplied.

flow_value

Optional unquoted numeric column in flows used to scale line widths. If omitted, each flow receives value 1.

flow_group

Optional unquoted column in flows used to colour flow lines and arrowheads by group.

flow_colours

Optional colours for flow_group. Use a named vector for stable group-colour matching. If omitted and flow groups match donut categories, colours is reused.

flow_min

Optional minimum flow value to draw.

flow_linewidth_range

Numeric vector of length 2 controlling flow line widths.

flow_curvature

Numeric curvature for trajectory lines. Use 0 for straight lines, positive values for one bend direction, and negative values for the opposite direction.

flow_n

Number of points used to approximate each curved trajectory.

flow_arrow

Should static flow trajectories include arrows?

flow_arrow_length

Arrow length in inches when flow_arrow = TRUE.

flow_colour, flow_alpha

Flow line colour and alpha. flow_colour is used when flow_group is not supplied.

map_fill, map_colour

Background map fill and outline colours.

donut_colour, donut_linewidth

Donut segment border colour and linewidth.

Value

A ggplot object.

Examples

demo <- data.frame(
  place = rep(c("A", "B", "C"), each = 3),
  lon = rep(c(-71.35, -71.2, -71.05), each = 3),
  lat = rep(c(46.75, 46.82, 46.73), each = 3),
  category = rep(c("x", "y", "z"), times = 3),
  value = c(10, 20, 5, 5, 15, 10, 12, 4, 9)
)

flows <- data.frame(
  from = c("A", "B"),
  to = c("B", "C"),
  trips = c(30, 10)
)

donut_map(
  demo,
  place,
  category,
  value,
  lon = lon,
  lat = lat,
  flows = flows,
  from = from,
  to = to,
  flow_value = trips
)

Compute donut polygons

Description

donut_polygons() turns tidy category values at spatial locations into an sf polygon layer. Each row of data represents one category for one location.

Usage

donut_polygons(
  data,
  id,
  category,
  value,
  lon = NULL,
  lat = NULL,
  input_crs = 4326,
  crs = NULL,
  map = NULL,
  radius_range = NULL,
  inner_radius = 0.55,
  n = 96,
  start_angle = pi/2
)

Arguments

data

A data frame or sf object. If data is not an sf object, lon and lat must be supplied.

id

Unquoted column identifying each donut location.

category

Unquoted column identifying donut categories.

value

Unquoted numeric column giving non-negative category values.

lon, lat

Unquoted longitude and latitude columns. Required when data is not an sf object.

input_crs

Coordinate reference system for lon and lat, or for an sf object with missing CRS. Defaults to EPSG:4326.

crs

Target projected CRS used to build the donut polygons. If NULL, a projected CRS is chosen from map, data, or an estimated UTM zone.

map

Optional sf object used only to choose the working CRS and default donut radius range.

radius_range

Numeric vector of length 2 giving minimum and maximum donut radii in map units. If NULL, a range is derived from the map extent.

inner_radius

Numeric value in ⁠(0, 1)⁠ giving the inner radius as a proportion of the outer radius.

n

Number of points used to approximate a complete outer circle.

start_angle

Start angle in radians. The default starts at 12 o'clock.

Value

An sf object with one polygon per non-zero location-category pair.

Examples

demo <- data.frame(
  place = rep(c("A", "B"), each = 3),
  lon = rep(c(-71.3, -71.1), each = 3),
  lat = rep(c(46.75, 46.85), each = 3),
  category = rep(c("x", "y", "z"), times = 2),
  value = c(10, 20, 5, 5, 15, 10)
)

donuts <- donut_polygons(demo, place, category, value, lon = lon, lat = lat)
plot(donuts["category"])

Compute origin-destination flow lines

Description

flow_lines() creates sf line geometries joining origin and destination locations. Lines can be straight or curved trajectories.

Usage

flow_lines(
  flows,
  locations,
  from,
  to,
  value = NULL,
  id,
  group = NULL,
  lon = NULL,
  lat = NULL,
  input_crs = 4326,
  crs = NULL,
  drop_self = TRUE,
  flow_curvature = 0,
  flow_n = 30
)

Arguments

flows

A data frame containing origin-destination pairs.

locations

A data frame or sf object containing one or more rows per location. Repeated locations are reduced to the first geometry per id.

from, to

Unquoted columns in flows identifying origin and destination ids.

value

Optional unquoted numeric column in flows used as flow value. If omitted, each flow receives value 1.

id

Unquoted location id column in locations.

group

Optional unquoted column in flows used to group or colour flow lines.

lon, lat

Unquoted longitude and latitude columns in locations. Required when locations is not an sf object.

input_crs

Coordinate reference system for lon and lat, or for an sf object with missing CRS. Defaults to EPSG:4326.

crs

Target projected CRS. If NULL, a projected CRS is selected from locations or an estimated UTM zone.

drop_self

Should self-flows be removed?

flow_curvature

Numeric curvature for trajectory lines. Use 0 for straight lines, positive values for one bend direction, and negative values for the opposite direction.

flow_n

Number of points used to approximate each curved trajectory.

Value

An sf object with one line per retained flow.

Examples

locations <- data.frame(
  place = c("A", "B"),
  lon = c(-71.3, -71.1),
  lat = c(46.75, 46.85)
)
flows <- data.frame(from = "A", to = "B", trips = 15)

lines <- flow_lines(
  flows,
  locations,
  from,
  to,
  trips,
  place,
  lon = lon,
  lat = lat
)
plot(lines["value"])

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