Title: An R Interface to 'Mapbox GL JS'
Version: 0.4.0
Date: 2020-10-28
Maintainer: Stefan Kuethe <crazycapivara@gmail.com>
Description: Makes 'Mapbox GL JS' https://docs.mapbox.com/mapbox-gl-js/api/, an open source JavaScript library that uses WebGL to render interactive maps, available within R via the 'htmlwidgets' package. Visualizations can be used from the R console, in R Markdown documents and in Shiny apps.
License: MIT + file LICENSE
Depends: R (≥ 2.10)
Imports: magrittr, htmlwidgets, htmltools, yaml, purrr, geojsonsf, methods
Encoding: UTF-8
LazyData: true
RoxygenNote: 6.1.1
Suggests: knitr, rmarkdown, shiny
VignetteBuilder: knitr
URL: https://github.com/crazycapivara/mapboxer
BugReports: https://github.com/crazycapivara/mapboxer/issues
NeedsCompilation: no
Packaged: 2020-10-28 17:52:19 UTC; gabbo
Author: Stefan Kuethe [aut, cre]
Repository: CRAN
Date/Publication: 2020-11-04 16:10:02 UTC

Add a circle layer to the map

Description

Add a circle layer to the map

Usage

add_circle_layer(map, source = NULL, filter = NULL,
  circle_blur = NULL, circle_color = NULL, circle_opacity = NULL,
  circle_pitch_alignment = NULL, circle_pitch_scale = NULL,
  circle_radius = NULL, circle_sort_key = NULL,
  circle_stroke_color = NULL, circle_stroke_opacity = NULL,
  circle_stroke_width = NULL, circle_translate = NULL,
  circle_translate_anchor = NULL, visibility = TRUE, popup = NULL,
  id = "circle-layer")

Arguments

map

A mapboxer object.

source

A Mapbox source. Uses the source from the mapboxer object if no source is supplied.

filter

A filter expression that is applied to the source.

circle_blur

(paint) Amount to blur the circle. 1 blurs the circle such that only the centerpoint is full opacity.

circle_color

(paint) The fill color of the circle.

circle_opacity

(paint) The opacity at which the circle will be drawn.

circle_pitch_alignment

(paint) Orientation of circle when map is pitched. One of "map", "viewport".

circle_pitch_scale

(paint) Controls the scaling behavior of the circle when the map is pitched. One of "map", "viewport".

circle_radius

(paint) The radius of the circle.

circle_sort_key

(layout) Sorts features in ascending order based on this value. Features with a higher sort key will appear above features with a lower sort key.

circle_stroke_color

(paint) The stroke color of the circle.

circle_stroke_opacity

(paint) The opacity of the circle's stroke.

circle_stroke_width

(paint) The width of the circle's stroke. Strokes are placed outside of the circle_radius.

circle_translate

(paint) The geometry's offset. Values are [x, y] where negatives indicate left and up, respectively.

circle_translate_anchor

(paint) Controls the frame of reference for circle_translate. One of "map", "viewport".

visibility

(layout) Whether the layer should be displayed.

popup

A mustache template in which the tags refer to the properties of the layer's data object.

id

The unique id of the layer.

See Also

https://docs.mapbox.com/mapbox-gl-js/style-spec/layers/#circle

Examples

map <- as_mapbox_source(motor_vehicle_collisions_nyc) %>%
  mapboxer() %>%
  set_view_state(-73.9165, 40.7114, 11) %>%
  add_circle_layer(
    circle_color = "red",
    circle_radius = 5,
    popup = "{{date}} {{time}}"
  )

if (interactive()) map

Add a standard control to the map

Description

Add a standard control to the map

Usage

add_control(map, control_name, ..., pos = NULL)

add_navigation_control(map, ..., pos = NULL)

add_scale_control(map, ..., pos = NULL)

add_fullscreen_control(map, pos = NULL)

Arguments

map

A mapboxer object.

control_name

The (class) name of the control.

...

The options of the control.

pos

The position of the control. One of top-left, top-right, bottom-right or bottom-left.

See Also

https://docs.mapbox.com/mapbox-gl-js/api/markers/ for available options for the used control.

Examples

map <- mapboxer() %>%
  add_navigation_control(
    pos = "top-left",
    showCompass = FALSE
  ) %>%
  add_fullscreen_control() %>%
  add_scale_control(
    unit = "nautical"
  )

if (interactive()) map

Add a draw control to the map (experimental)

Description

Add a draw control to the map (experimental)

Usage

add_draw_control(map, ..., pos = NULL, data = NULL)

Arguments

map

A mapboxer object.

...

The options of the control.

pos

The position of the control. One of top-left, top-right, bottom-right or bottom-left.

data

A GeoJSON or sf object.

See Also

https://github.com/mapbox/mapbox-gl-draw/blob/main/docs/API.md for available options for the draw control.

Add a fill layer to the map

Description

Add a fill layer to the map

Usage

add_fill_layer(map, source = NULL, filter = NULL,
  fill_antialias = TRUE, fill_color = NULL, fill_opacity = NULL,
  fill_outline_color = NULL, fill_pattern = NULL,
  fill_sort_key = NULL, fill_translate = NULL,
  fill_translate_anchor = NULL, visibility = TRUE, popup = NULL,
  id = "fill-layer")

Arguments

map

A mapboxer object.

source

A Mapbox source. Uses the source from the mapboxer object if no source is supplied.

filter

A filter expression that is applied to the source.

fill_antialias

(paint) Whether or not the fill should be antialiased.

fill_color

(paint) The color of the filled part of this layer. This color can be specified as rgba with an alpha component and the color's opacity will not affect the opacity of the 1px stroke, if it is used.

fill_opacity

(paint) The opacity of the entire fill layer. In contrast to the fill_color, this value will also affect the 1px stroke around the fill, if the stroke is used.

fill_outline_color

(paint) The outline color of the fill. Matches the value of fill_color if unspecified.

fill_pattern

(paint) Name of image in sprite to use for drawing image fills.

fill_sort_key

(layout) Sorts features in ascending order based on this value. Features with a higher sort key will appear above features with a lower sort key.

fill_translate

(paint) The geometry's offset. Values are [x, y] where negatives indicate left and up, respectively.

fill_translate_anchor

(paint) Controls the frame of reference for fill_translate. One of "map", "viewport".

visibility

(layout) Whether the layer should be displayed.

popup

A mustache template in which the tags refer to the properties of the layer's data object.

id

The unique id of the layer.

See Also

https://docs.mapbox.com/mapbox-gl-js/style-spec/layers/#fill

Examples

 map <- as_mapbox_source(geojsonsf::geo_melbourne) %>%
  mapboxer() %>%
  set_view_state(
    lng =  144.9624,
    lat = -37.8105,
    zoom = 10,
    pitch = 35
  ) %>%
  add_fill_layer(
    fill_color = c("get", "fillColor"),
    fill_opacity = 0.6,
    popup = "Area: {{AREASQKM}} km<sup>2</sup>",
    # AREASQKM > 5
    filter = list(">", c("get", "AREASQKM"), 5)
  )

if (interactive()) map

Add a filter control to the map

Description

Add a filter control to the map

Usage

add_filter_control(map, layer_id, filter = NULL, pos = NULL,
  rows = 1, cols = 20)

Arguments

map

A mapboxer object.

layer_id

The ID of the layer to which the filter is attached.

filter

The initial filter expression.

pos

The position of the control. One of top-left, top-right, bottom-right or bottom-left.

rows

The number of rows of the textarea input.

cols

The number of columns of the textarea input.

Add a layer to the map

Description

Adds any kind of layer to the map. The type of the layer is specified by the type property of the layer definintion.

Usage

add_layer(map, style, popup = NULL)

Arguments

map

A mapboxer object.

style

A named list that defines the style of the layer. See https://docs.mapbox.com/mapbox-gl-js/style-spec/layers/ for available style options for the used layer type.

popup

A mustache template in which the tags refer to the properties of the layer's data object.

See Also

add_popups for an example of a mustache template used to generate the popup text.

Examples

image_src <- mapbox_source(
  type = "image",
  url = "https://docs.mapbox.com/mapbox-gl-js/assets/radar.gif",
  coordinates = list(
    c(-80.425, 46.437),
    c(-71.516, 46.437),
    c(-71.516, 37.936),
    c(-80.425, 37.936)
  )
)

raster_style <- list(
  id = "overlay",
  type = "raster",
  source = image_src,
  paint = list(
    "raster-opacity" = 0.85
  )
)

map <- mapboxer(
  center = c(-75.789, 41.874),
  zoom = 5
) %>%
  add_layer(raster_style)

if (interactive()) map

Add a line layer to the map

Description

Add a line layer to the map

Usage

add_line_layer(map, source = NULL, filter = NULL, line_blur = NULL,
  line_cap = NULL, line_color = NULL, line_dasharray = NULL,
  line_gap_width = NULL, line_gradient = NULL, line_join = NULL,
  line_miter_limit = NULL, line_offset = NULL, line_opacity = NULL,
  line_pattern = NULL, line_round_limit = NULL, line_sort_key = NULL,
  line_translate = NULL, line_translate_anchor = NULL,
  line_width = NULL, visibility = NULL, popup = NULL,
  id = "line-layer")

Arguments

map

A mapboxer object.

source

A Mapbox source. Uses the source from the mapboxer object if no source is supplied.

filter

A filter expression that is applied to the source.

line_blur

(paint) Blur applied to the line, in pixels.

line_cap

(layout) The display of line endings. One of "butt", "round", "square".

line_color

(paint) The color with which the line will be drawn.

line_dasharray

(paint) Specifies the lengths of the alternating dashes and gaps that form the dash pattern.

line_gap_width

(paint) Draws a line casing outside of a line's actual path. The value indicates the width of the inner gap.

line_gradient

(paint) Defines a gradient with which to color a line feature. Can only be used with GeoJSON sources that specify lineMetrics = TRUE.

line_join

(layout) The display of lines when joining. One of "bevel", "round", "miter".

line_miter_limit

(layout) Used to automatically convert miter joins to bevel joins for sharp angles. Requires line_join to be "miter".

line_offset

(paint) The line's offset. For linear features, a positive value offsets the line to the right, relative to the direction of the line, and a negative value to the left. For polygon features, a positive value results in an inset, and a negative value results in an outset.

line_opacity

(paint) The opacity at which the line will be drawn.

line_pattern

(paint) Name of image in sprite to use for drawing image lines.

line_round_limit

(layout) Used to automatically convert round joins to miter joins for shallow angles.

line_sort_key

(layout) Sorts features in ascending order based on this value. Features with a higher sort key will appear above features with a lower sort key.

line_translate

(paint) The geometry's offset. Values are [x, y] where negatives indicate left and up, respectively.

line_translate_anchor

(paint) Controls the frame of reference for line_translate.

line_width

(paint) Stroke thickness.

visibility

(layout) Whether the layer should be displayed.

popup

A mustache template in which the tags refer to the properties of the layer's data object.

id

The unique id of the layer.

See Also

https://docs.mapbox.com/mapbox-gl-js/style-spec/layers/#line

Examples

map <-  as_mapbox_source(geojsonsf::geo_melbourne) %>%
  mapboxer(
    center = c(144.9624, -37.8105),
    zoom = 11,
    pitch = 45
  ) %>%
  add_navigation_control() %>%
  add_line_layer(
    line_color = c("get", "strokeColor"),
    line_width = 2,
    popup = "{{SA2_NAME}}"
  )

if (interactive()) map

Add a single marker to the map

Description

Add a single marker to the map

Usage

add_marker(map, lng, lat, popup = NULL)

Arguments

map

A mapboxer object.

lng

The longitude of the marker.

lat

The latitude of the marker.

popup

The popup text (HTML) that is displayed when you click on the marker.

Examples

lng <- -0.09
lat <- 51.5

map <- mapboxer() %>%
  set_view_state(lng, lat) %>%
  add_marker(lng, lat, popup = "You are here!")

if (interactive()) map

Add a mouse position control to the map

Description

Add a mouse position control to the map

Usage

add_mouse_position_control(map, mustache_template = NULL, pos = NULL,
  css_text = NULL)

Arguments

map

A mapboxer object.

mustache_template

A mustache template that contains the mustache tags lng and lat.

pos

The position of the control. One of top-left, top-right, bottom-right or bottom-left.

css_text

A cssText string that will modify the style of the control element.

Examples

map <- mapboxer(zoom = 4) %>%
  add_mouse_position_control(
    mustache_template = "<b>Lng:</b>{{lng}}, <b>Lat:</b>{{lat}}",
    pos = "bottom-left"
  )

if (interactive()) map

Add popups to a layer

Description

Usually you will add the popups in the add_layer function by setting the popup parameter.

Usage

add_popups(map, layer_id, popup)

Arguments

map

A mapboxer object.

layer_id

The ID of the layer to which you want to add the popups.

popup

A mustache template in which the tags refer to the properties of the layer's data object.

Examples

LAYER_ID <- "crashes"

mustache_tpl <- "
  <b>Date:</b> {{date}}</br>
  <b>Time:</b> {{time}}</br>
  <b>Number of persons injured:</b> {{injured}}
"

map <- motor_vehicle_collisions_nyc %>%
  as_mapbox_source() %>%
  mapboxer(
    center = c(-73.9165, 40.7114),
    zoom = 9
  ) %>%
  add_circle_layer(
    circle_color = "red",
    circle_blur = 1,
    filter = list(">", "injured", 0),
    id = LAYER_ID
  ) %>%
  add_popups(
    LAYER_ID,
    popup = mustache_tpl
  )

if (interactive()) map

Add a Mapbox source to the map

Description

Add a Mapbox source to the map

Usage

add_source(map, source, id = "mapboxer")

Arguments

map

A mapboxer object.

source

A Mapbox source.

id

The unique id of the data source.

Add a text control to the map

Description

Add a text control to the map

Usage

add_text_control(map, text, pos = NULL, css_text = NULL)

Arguments

map

A mapboxer object.

text

The text (HTML) that is displayed.

pos

The position of the control. One of top-left, top-right, bottom-right or bottom-left.

css_text

A cssText string that will modify the style of the control element.

Add tooltips to a layer

Description

Add tooltips to a layer

Usage

add_tooltips(map, layer_id, tooltip)

Arguments

map

A mapboxer object.

layer_id

The ID of the layer to which you want to add the tooltips.

tooltip

A mustache template in which the tags refer to the properties of the layer's data object.

Convert a data object to a Mapbox GeoJSON source

Description

Convert a data object to a Mapbox GeoJSON source

Usage

as_mapbox_source(data, ...)

## S3 method for class 'json'
as_mapbox_source(data, ...)

## S3 method for class 'data.frame'
as_mapbox_source(data, lng = "lng", lat = "lat",
  ...)

## S3 method for class 'sf'
as_mapbox_source(data, ...)

Arguments

data

A data frame that contains longitudes and latitudes in separate columns or an sf-object.

...

The properties of the source. See https://docs.mapbox.com/mapbox-gl-js/style-spec/sources for available options for the given source type.

lng

The name of the column containing the longitudes.

lat

The name of the column containing the latitudes.

Create a background style

Description

Creates a background style that can be used as basemap.

Usage

basemap_background_style(color = "#111", opacity = 1)

Arguments

color

The color of the background.

opacity

The opacity of the background.

Create a raster style

Description

Creates a raster style that can be used as a basemap.

Usage

basemap_raster_style(tiles = stamen_raster_tiles("terrain"),
  attribution = NULL)

Arguments

tiles

A list of tile URLs.

attribution

The attribution text of the tile layer.

A list of basemap style URLs

Description

A list of basemap style URLs

Usage

basemaps

Format

An object of class list of length 2.

Fit the map to a bounding box

Description

Fit the map to a bounding box

Usage

fit_bounds(map, bounds, ...)

Arguments

map

A mapboxer object.

bounds

The bounding box as a vector in [west, south, east, north] order or a bbox object.

...

Optional arguments, see https://docs.mapbox.com/mapbox-gl-js/api/map/#map#fitbounds.

Create a Mapbox source

Description

Create a Mapbox source

Usage

mapbox_source(type, ...)

Arguments

type

The type of the source, e. g. geojson.

...

The properties of the source. See https://docs.mapbox.com/mapbox-gl-js/style-spec/sources for available options for the given source type.

Create a mapboxer widget

Description

Create a mapboxer widget

Usage

mapboxer(source = NULL, style = basemaps$Carto$dark_matter, ...,
  width = NULL, height = NULL, element_id = NULL,
  token = Sys.getenv("MAPBOX_API_TOKEN"))

Arguments

source

A mapbox_source that is added to the map with the ID MAPBOXER.

style

The map's Mapbox style.

...

The properties of the map, see https://docs.mapbox.com/mapbox-gl-js/api/map/.

width

The width of the widget.

height

The height of the widget.

element_id

The unique ID of the widget.

token

A Mapbox API access token. Only needed if you want to use styles from Mapbox.

Examples

map <- mapboxer(
  center = c(-73.9165, 40.7114),
  zoom = 10,
  minZoom = 6,
  pitch = 30,
  bearing = 45
)

if (interactive()) map

Shiny bindings for mapboxer

Description

Output and render functions for using mapboxer within Shiny applications and interactive Rmd documents.

Usage

mapboxerOutput(outputId, width = "100%", height = "400px")

renderMapboxer(expr, env = parent.frame(), quoted = FALSE)

Arguments

outputId

output variable to read from

width, height

Must be a valid CSS unit (like '100%', '400px', 'auto') or a number, which will be coerced to a string and have 'px' appended.

expr

An expression that generates a mapboxer

env

The environment in which to evaluate expr.

quoted

Is expr a quoted expression (with quote())? This is useful if you want to save an expression in a variable.

Examples

library(shiny)
library(mapboxer)

LAYER_ID <- "mvc"

view <- basicPage(
  h1("mapboxer"),
  sliderInput(
    "slider",
    "Number of persons injured",
    min = 0,
    max = max(motor_vehicle_collisions_nyc$injured),
    step = 1,
    value = 0
  ),
  checkboxInput("hide", "Hide layer"),
  mapboxerOutput("map"),
  htmlOutput("datetime")
)

server <- function(input, output) {
  output$map <- renderMapboxer({
      as_mapbox_source(motor_vehicle_collisions_nyc) %>%
      mapboxer(
        center = c(-73.9165, 40.7114),
        zoom = 10,
        style = basemap_raster_style(stamen_raster_tiles())
      ) %>%
      add_circle_layer(
        circle_color = "black",
        popup = "Number of persons injured {{injured}}",
        id = LAYER_ID
      ) %>%
      add_mouse_position_control(
        "Lng: {{lng}}</br>Lat: {{lat}}",
        css_text = "text-align: left; width: 180px;"
      ) %>%
      add_navigation_control(pos = "top-left")
  })

  observeEvent(input$slider, {
    mapboxer_proxy("map") %>%
      set_filter(LAYER_ID, list("==", "injured", input$slider)) %>%
      update_mapboxer()
  })

  observeEvent(input$hide, {
    mapboxer_proxy("map") %>%
      set_layout_property(LAYER_ID, "visibility", !input$hide) %>%
      update_mapboxer()
  })

  output$datetime <- renderText({
    props <- input$map_onclick$props
    sprintf("<p>%s %s</p>", props$date, props$time)
  })
}

if (interactive()) shinyApp(view, server)

Create a mapboxer proxy object

Description

Create a mapboxer-like object that can be used to update a mapboxer object that has already been rendered in a Shiny app.

Usage

mapboxer_proxy(shiny_id, session = shiny::getDefaultReactiveDomain())

Arguments

shiny_id

The output ID of the mapboxer object that should be updated.

session

The current Shiny session object. Usually the default value can be used.

See Also

update_mapboxer

Motor Vehicle Collisions in NYC

Description

Motor Vehicle Collisions in NYC

Usage

motor_vehicle_collisions_nyc

Format

A data frame with 1601 rows and 6 variables, where each row is a Motor Vehicle Collision:

date

occurrence date of collision

time

occurrence time of collision

lng

latitude coordinate for Global Coordinate System, WGS 1984, decimal degrees (EPSG 4326)

lat

longitude coordinate for Global Coordinate System, WGS 1984, decimal degrees (EPSG 4326)

injured

number of persons injured

killed

number of persons killed

Source

https://opendata.cityofnewyork.us/

Objects exported from other packages

Description

These objects are imported from other packages. Follow the links below to see their documentation.

magrittr

%>%, %<>%

Update the data of a Mapbox source

Description

Update the data of a Mapbox source

Usage

set_data(map, data, source_id = NULL, ...)

## S3 method for class 'character'
set_data(map, data, source_id = NULL, ...)

## S3 method for class 'json'
set_data(map, data, source_id = NULL, ...)

## S3 method for class 'data.frame'
set_data(map, data, source_id = NULL, lng = "lng",
  lat = "lat", ...)

## S3 method for class 'sf'
set_data(map, data, source_id, ...)

Arguments

map

A mapboxer_proxy object.

data

A GeoJSON object, an url pointing to an external GeoJSON document, a data frame that contains longitudes and latitudes in separate columns or an sf-object.

source_id

The ID of the source whose data should be updated.

...

unused

lng

The name of the column containing the longitudes.

lat

The name of the column containing the latitudes.

See Also

Set the filter of a layer

Description

Set the filter of a layer

Usage

set_filter(map, layer_id, filter)

Arguments

map

A mapboxer object.

layer_id

The ID of the layer whose property should be updated.

filter

A filter expression that is applied to the source.

Update layer properties

Description

Update layer properties

Usage

set_paint_property(map, layer_id, property, value)

set_layout_property(map, layer_id, property, value)

Arguments

map

A mapboxer object.

layer_id

The ID of the layer whose property should be updated.

property

The name of the property that should be updated.

value

The new value of the property.

Functions

Set the style of the map

Description

Set the style of the map

Usage

set_style(map, style)

Arguments

map

A mapboxer object.

style

The map's Mapbox style.

Set the view state of the map

Description

Set the view state of the map

Usage

set_view_state(map, lng, lat, zoom = 9, pitch = 0, bearing = 0)

Arguments

map

A mapboxer object.

lng

The longitude of the geographical center point of the map.

lat

The latitude of the geographical center point of the map.

zoom

The zoom level of the map.

pitch

The pitch (tilt) of the map.

bearing

The bearing (rotation) of the map.

Get Stamen raster tile URLs

Description

Get Stamen raster tile URLs

Usage

stamen_raster_tiles(theme = c("watercolor"))

Arguments

theme

The theme of the tiles.

Update a mapboxer proxy object in a Shiny app

Description

Update a mapboxer proxy object in a Shiny app

Usage

update_mapboxer(proxy_obj, ...)

Arguments

proxy_obj

A mapboxer_proxy object.

...

unused