knitr::opts_chunk$set(fig.width = 8.83, message = FALSE, warning = FALSE)
Package leafem provides a few extra add*
functions for use with leaflet (and mapview).
addMouseCoordinates
- add a box with mouse position, projection information and zoom level informationaddLogo
- add images to mapsaddHomeButton
- add zoom-to button to a mapaddFeatures
- add features to a map, regardless of features type unresposniveHere are some examples:
let's us add mouse position information along with detailed information about the layer's projection and zoom level information. By default, only lon
, lat
and zoom
are shown. To also show info on the epsg code
and the proj4string
press and hold Ctrl and move the mouse. addMouseCoordinates
also allows us to copy the info about the current mouse position to the clipboard by holding the Ctrl and left-clicking on the map.
library(mapview) library(leaflet) library(leafem) leaflet() %>% addTiles() %>% leafem::addMouseCoordinates()
can be used to add logos (or any type of image really) to a map
library(leafem) img <- "https://www.r-project.org/logo/Rlogo.svg" leaflet() %>% addTiles() %>% leafem::addLogo(img, url = "https://www.r-project.org/logo/")
arguments offset.x
, offset.y
together with position
give control about image placement. See ?addLogo
for details
m <- mapview(breweries) library(leafem) leafem::addLogo(m, "https://jeroenooms.github.io/images/banana.gif", position = "bottomleft", offset.x = 5, offset.y = 40, width = 100, height = 100)
can be used to add 'zoom-to-layer' buttons to a map. By default located in the bottom-right corner of the map (can be changed using argument position
)
library(raster) library(leafem) leaflet() %>% addTiles() %>% addCircleMarkers(data = breweries91) %>% leafem::addHomeButton(ext = extent(breweries91), group = "Breweries")
is a type agnostic add*
function which will call the approprate leaflet::add*
function based on the provided feature type (points, lines, polygons). It is currently defined for handling objects from packages sf
and sp
. For sf
objects, in addition to the standard feature types POINT
, MULTIPOINT
, LINESTRING
, MULTILINESTRING
, POLYGON
and MULTIPOLYGON
it can also handle features of type sfc_GEOMETRY
which are a collection of mixed types.
library(leafem) leaflet() %>% addTiles() %>% leafem::addFeatures(breweries)
The standard styling arguments for leaflet::add*
functions can be used just like in the original add*
function
library(leafem) leaflet() %>% addTiles() %>% leafem::addFeatures(franconia, weight = 1, fillColor = "grey", color = "black", opacity = 1, fillOpacity = 0.6)
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