add polylines to a leaflet map using Leaflet.glify

Leaflet.glify is a web gl renderer plugin for leaflet. See https://github.com/robertleeplummerjr/Leaflet.glify for details and documentation.

Usage

addGlPolylines(
  map,
  data,
  color = cbind(0, 0.2, 1),
  opacity = 0.6,
  group = "glpolylines",
  popup = NULL,
  label = NULL,
  weight = 1,
  layerId = NULL,
  src = FALSE,
  pane = "overlayPane",
  ...
)

addGlPoints(
  map,
  data,
  fillColor = "#0033ff",
  fillOpacity = 0.8,
  radius = 10,
  group = "glpoints",
  popup = NULL,
  label = NULL,
  layerId = NULL,
  src = FALSE,
  pane = "overlayPane",
  ...
)

addGlPolygons(
  map,
  data,
  color = cbind(0, 0.2, 1),
  fillColor = color,
  fillOpacity = 0.8,
  group = "glpolygons",
  popup = NULL,
  label = NULL,
  layerId = NULL,
  src = FALSE,
  pane = "overlayPane",
  ...
)

Arguments

map

a leaflet map to add points/polygons to.

data

sf/sp point/polygon data to add to the map.

color

Object representing the color. Can be of class integer, character with color names, HEX codes or random characters, factor, matrix, data.frame, list, json or formula. See the examples or makeColorMatrix for more information.

opacity

feature opacity. Numeric between 0 and 1. Note: expect funny results if you set this to < 1.

group

a group name for the feature layer.

popup

Object representing the popup. Can be of type character with column names, formula, logical, data.frame or matrix, Spatial, list or JSON. If the length does not match the number of rows in the dataset, the popup vector is repeated to match the dimension.

label

either a column name (currently only supported for polygons and polylines) or a character vector to be used as label.

weight

line width/thicknes in pixels for addGlPolylines.

layerId

the layer id

src

whether to pass data to the widget via file attachments.

pane

A string which defines the pane of the layer. The default is "overlayPane".

...

Used to pass additional named arguments to to_json & to pass additional arguments to the underlying JavaScript functions. Typical use-cases include setting 'digits' to round the point coordinates or to pass a different 'fragmentShaderSource' to control the shape of the points. Use 'point' (default) to render circles with a thin black outline, 'simpleCircle' for circles without outline or 'sqaure' for squares (without outline).

fillColor

fill color.

fillOpacity

fill opacity.

radius

point size in pixels.

Details

MULTILINESTRINGs are currently not supported! Make sure you cast your data to LINETSRING first (e.g. using sf::st_cast(data, "LINESTRING").

MULTIPOLYGONs are currently not supported! Make sure you cast your data to POLYGON first (e.g. using sf::st_cast(data, "POLYGON").

Functions

• addGlPolylines(): add polylines to a leaflet map using Leaflet.glify

• addGlPoints(): add points to a leaflet map using Leaflet.glify

• addGlPolygons(): add polygons to a leaflet map using Leaflet.glify

Examples

if (interactive()) {
library(leaflet)
library(leafgl)
library(sf)

storms = st_as_sf(atlStorms2005)

cols = heat.colors(nrow(storms))

leaflet() %>%
  addProviderTiles(provider = providers$CartoDB.Positron) %>%
  addGlPolylines(data = storms, color = cols, popup = TRUE, opacity = 1)
}

if (interactive()) {
library(leaflet)
library(leafgl)
library(sf)

n = 1e5

df1 = data.frame(id = 1:n,
                 x = rnorm(n, 10, 1),
                 y = rnorm(n, 49, 0.8))
pts = st_as_sf(df1, coords = c("x", "y"), crs = 4326)

cols = topo.colors(nrow(pts))

leaflet() %>%
  addProviderTiles(provider = providers$CartoDB.DarkMatter) %>%
  addGlPoints(data = pts, fillColor = cols, popup = TRUE)

}

if (interactive()) {
library(leaflet)
library(leafgl)
library(sf)

gadm = st_as_sf(gadmCHE)
gadm = st_cast(gadm, "POLYGON")
cols = grey.colors(nrow(gadm))

leaflet() %>%
  addProviderTiles(provider = providers$CartoDB.DarkMatter) %>%
  addGlPolygons(data = gadm, color = cols, popup = TRUE)
}