leaflet-image

leaflet-image

Export images out of Leaflet maps without a server component, by using Canvas and CORS.

Requirements

• Any tile layer providers (OSM, MapBox, etc) must support CORS
• Any markers on the map must also support CORS. The default Leaflet-CDN markers don't, so they aren't supported.
• Your browser must support CORS and Canvas, so IE >= 10 with no exceptions.
• You must set L_PREFER_CANVAS = true; so that vector layers are drawn in Canvas rather than SVG or VML.

usage

browserify

npm install --save leaflet-image

web

curl https://raw.github.com/mapbox/leaflet-image/gh-pages/leaflet-image.js > leaflet-image.js

example

var map = L.mapbox.map('map', 'tmcw.map-u4ca5hnt').setView([38.9, -77.03], 14);
leafletImage(map, function(err, canvas) {
    // now you have canvas
    // example thing to do with that canvas:
    var img = document.createElement('img');
    var dimensions = map.getSize();
    img.width = dimensions.x;
    img.height = dimensions.y;
    img.src = canvas.toDataURL();
    document.getElementById('images').innerHTML = '';
    document.getElementById('images').appendChild(img);
});

Plugin CDN

leaflet-image is available through the Mapbox Plugin CDN so you don't need to download & copy it. Just include the following script tag:

<script src='//api.tiles.mapbox.com/mapbox.js/plugins/leaflet-image/v0.0.3/leaflet-image.js'></script>

api

leafletImage(map, callback)

map is a L.map or L.mapbox.map, callback takes (err, canvas).