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(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD
define(['leaflet', 'mapbox-gl'], factory);
} else if (typeof exports === 'object') {
// Node, CommonJS-like
module.exports = factory(require('leaflet'), require('mapbox-gl'));
} else {
// Browser globals (root is window)
root.returnExports = factory(window.L, window.mapboxgl);
}
}(this, function (L, mapboxgl) {
L.MapboxGL = L.Layer.extend({
options: {
updateInterval: 32
},
initialize: function (options) {
L.setOptions(this, options);
if (options.accessToken) {
mapboxgl.accessToken = options.accessToken;
} else {
throw new Error('You should provide a Mapbox GL access token as a token option.');
}
/**
* Create a version of `fn` that only fires once every `time` millseconds.
*
* @param {Function} fn the function to be throttled
* @param {number} time millseconds required between function calls
* @param {*} context the value of `this` with which the function is called
* @returns {Function} debounced function
* @private
*/
var throttle = function (fn, time, context) {
var lock, args, wrapperFn, later;
later = function () {
// reset lock and call if queued
lock = false;
if (args) {
wrapperFn.apply(context, args);
args = false;
}
};
wrapperFn = function () {
if (lock) {
// called too soon, queue to call later
args = arguments;
} else {
// call and lock until later
fn.apply(context, arguments);
setTimeout(later, time);
lock = true;
}
};
return wrapperFn;
};
// setup throttling the update event when panning
this._throttledUpdate = throttle(L.Util.bind(this._update, this), this.options.updateInterval);
},
onAdd: function (map) {
if (!this._glContainer) {
this._initContainer();
}
this.getPane().appendChild(this._glContainer);
this._initGL();
this._offset = this._map.containerPointToLayerPoint([0, 0]);
// work around https://github.com/mapbox/mapbox-gl-leaflet/issues/47
if (map.options.zoomAnimation) {
L.DomEvent.on(map._proxy, L.DomUtil.TRANSITION_END, this._transitionEnd, this);
}
},
onRemove: function (map) {
if (this._map._proxy && this._map.options.zoomAnimation) {
L.DomEvent.off(this._map._proxy, L.DomUtil.TRANSITION_END, this._transitionEnd, this);
}
this.getPane().removeChild(this._glContainer);
this._glMap.remove();
this._glMap = null;
},
getEvents: function () {
return {
move: this._throttledUpdate, // sensibly throttle updating while panning
zoomanim: this._animateZoom, // applys the zoom animation to the <canvas>
zoom: this._pinchZoom, // animate every zoom event for smoother pinch-zooming
zoomstart: this._zoomStart, // flag starting a zoom to disable panning
zoomend: this._zoomEnd
};
},
_initContainer: function () {
var container = this._glContainer = L.DomUtil.create('div', 'leaflet-gl-layer');
var size = this._map.getSize();
container.style.width = size.x + 'px';
container.style.height = size.y + 'px';
},
_initGL: function () {
var center = this._map.getCenter();
var options = L.extend({}, this.options, {
container: this._glContainer,
interactive: false,
center: [center.lng, center.lat],
zoom: this._map.getZoom() - 1,
attributionControl: false
});
this._glMap = new mapboxgl.Map(options);
// allow GL base map to pan beyond min/max latitudes
this._glMap.transform.latRange = null;
if (this._glMap._canvas.canvas) {
// older versions of mapbox-gl surfaced the canvas differently
this._glMap._actualCanvas = this._glMap._canvas.canvas;
} else {
this._glMap._actualCanvas = this._glMap._canvas;
}
// treat child <canvas> element like L.ImageOverlay
L.DomUtil.addClass(this._glMap._actualCanvas, 'leaflet-image-layer');
L.DomUtil.addClass(this._glMap._actualCanvas, 'leaflet-zoom-animated');
},
_update: function (e) {
// update the offset so we can correct for it later when we zoom
this._offset = this._map.containerPointToLayerPoint([0, 0]);
if (this._zooming) {
return;
}
var size = this._map.getSize(),
container = this._glContainer,
gl = this._glMap,
topLeft = this._map.containerPointToLayerPoint([0, 0]);
L.DomUtil.setPosition(container, topLeft);
var center = this._map.getCenter();
// gl.setView([center.lat, center.lng], this._map.getZoom() - 1, 0);
// calling setView directly causes sync issues because it uses requestAnimFrame
var tr = gl.transform;
tr.center = mapboxgl.LngLat.convert([center.lng, center.lat]);
tr.zoom = this._map.getZoom() - 1;
if (gl.transform.width !== size.x || gl.transform.height !== size.y) {
container.style.width = size.x + 'px';
container.style.height = size.y + 'px';
if (gl._resize !== null && gl._resize !== undefined){
gl._resize();
} else {
gl.resize();
}
} else {
// older versions of mapbox-gl surfaced update publicly
if (gl._update !== null && gl._update !== undefined){
gl._update();
} else {
gl.update();
}
}
},
// update the map constantly during a pinch zoom
_pinchZoom: function (e) {
this._glMap.jumpTo({
zoom: this._map.getZoom() - 1,
center: this._map.getCenter()
});
},
// borrowed from L.ImageOverlay https://github.com/Leaflet/Leaflet/blob/master/src/layer/ImageOverlay.js#L139-L144
_animateZoom: function (e) {
var scale = this._map.getZoomScale(e.zoom),
offset = this._map._latLngToNewLayerPoint(this._map.getBounds().getNorthWest(), e.zoom, e.center);
L.DomUtil.setTransform(this._glMap._actualCanvas, offset.subtract(this._offset), scale);
},
_zoomStart: function (e) {
this._zooming = true;
},
_zoomEnd: function () {
var scale = this._map.getZoomScale(this._map.getZoom()),
offset = this._map._latLngToNewLayerPoint(this._map.getBounds().getNorthWest(), this._map.getZoom(), this._map.getCenter());
L.DomUtil.setTransform(this._glMap._actualCanvas, offset.subtract(this._offset), scale);
this._zooming = false;
},
_transitionEnd: function (e) {
L.Util.requestAnimFrame(function () {
var zoom = this._map.getZoom(),
center = this._map.getCenter(),
offset = this._map.latLngToContainerPoint(this._map.getBounds().getNorthWest());
// reset the scale and offset
L.DomUtil.setTransform(this._glMap._actualCanvas, offset, 1);
// enable panning once the gl map is ready again
this._glMap.once('moveend', L.Util.bind(function () {
this._zoomEnd();
}, this));
// update the map position
this._glMap.jumpTo({
center: center,
zoom: zoom - 1
});
}, this);
}
});
L.mapboxGL = function (options) {
return new L.MapboxGL(options);
};
}));