1406 lines
40 KiB
JavaScript
1406 lines
40 KiB
JavaScript
/*
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* L.MarkerClusterGroup extends L.FeatureGroup by clustering the markers contained within
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*/
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export var MarkerClusterGroup = L.MarkerClusterGroup = L.FeatureGroup.extend({
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options: {
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maxClusterRadius: 80, //A cluster will cover at most this many pixels from its center
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iconCreateFunction: null,
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clusterPane: L.Marker.prototype.options.pane,
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spiderfyOnEveryZoom: false,
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spiderfyOnMaxZoom: true,
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showCoverageOnHover: true,
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zoomToBoundsOnClick: true,
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singleMarkerMode: false,
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disableClusteringAtZoom: null,
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// Setting this to false prevents the removal of any clusters outside of the viewpoint, which
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// is the default behaviour for performance reasons.
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removeOutsideVisibleBounds: true,
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// Set to false to disable all animations (zoom and spiderfy).
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// If false, option animateAddingMarkers below has no effect.
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// If L.DomUtil.TRANSITION is falsy, this option has no effect.
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animate: true,
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//Whether to animate adding markers after adding the MarkerClusterGroup to the map
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// If you are adding individual markers set to true, if adding bulk markers leave false for massive performance gains.
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animateAddingMarkers: false,
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// Make it possible to provide custom function to calculate spiderfy shape positions
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spiderfyShapePositions: null,
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//Increase to increase the distance away that spiderfied markers appear from the center
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spiderfyDistanceMultiplier: 1,
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// Make it possible to specify a polyline options on a spider leg
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spiderLegPolylineOptions: { weight: 1.5, color: '#222', opacity: 0.5 },
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// When bulk adding layers, adds markers in chunks. Means addLayers may not add all the layers in the call, others will be loaded during setTimeouts
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chunkedLoading: false,
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chunkInterval: 200, // process markers for a maximum of ~ n milliseconds (then trigger the chunkProgress callback)
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chunkDelay: 50, // at the end of each interval, give n milliseconds back to system/browser
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chunkProgress: null, // progress callback: function(processed, total, elapsed) (e.g. for a progress indicator)
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//Options to pass to the L.Polygon constructor
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polygonOptions: {}
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},
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initialize: function (options) {
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L.Util.setOptions(this, options);
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if (!this.options.iconCreateFunction) {
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this.options.iconCreateFunction = this._defaultIconCreateFunction;
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}
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this._featureGroup = L.featureGroup();
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this._featureGroup.addEventParent(this);
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this._nonPointGroup = L.featureGroup();
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this._nonPointGroup.addEventParent(this);
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this._inZoomAnimation = 0;
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this._needsClustering = [];
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this._needsRemoving = []; //Markers removed while we aren't on the map need to be kept track of
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//The bounds of the currently shown area (from _getExpandedVisibleBounds) Updated on zoom/move
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this._currentShownBounds = null;
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this._queue = [];
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this._childMarkerEventHandlers = {
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'dragstart': this._childMarkerDragStart,
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'move': this._childMarkerMoved,
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'dragend': this._childMarkerDragEnd,
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};
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// Hook the appropriate animation methods.
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var animate = L.DomUtil.TRANSITION && this.options.animate;
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L.extend(this, animate ? this._withAnimation : this._noAnimation);
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// Remember which MarkerCluster class to instantiate (animated or not).
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this._markerCluster = animate ? L.MarkerCluster : L.MarkerClusterNonAnimated;
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},
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addLayer: function (layer) {
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if (layer instanceof L.LayerGroup) {
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return this.addLayers([layer]);
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}
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//Don't cluster non point data
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if (!layer.getLatLng) {
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this._nonPointGroup.addLayer(layer);
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this.fire('layeradd', { layer: layer });
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return this;
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}
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if (!this._map) {
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this._needsClustering.push(layer);
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this.fire('layeradd', { layer: layer });
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return this;
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}
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if (this.hasLayer(layer)) {
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return this;
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}
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//If we have already clustered we'll need to add this one to a cluster
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if (this._unspiderfy) {
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this._unspiderfy();
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}
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this._addLayer(layer, this._maxZoom);
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this.fire('layeradd', { layer: layer });
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// Refresh bounds and weighted positions.
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this._topClusterLevel._recalculateBounds();
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this._refreshClustersIcons();
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//Work out what is visible
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var visibleLayer = layer,
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currentZoom = this._zoom;
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if (layer.__parent) {
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while (visibleLayer.__parent._zoom >= currentZoom) {
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visibleLayer = visibleLayer.__parent;
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}
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}
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if (this._currentShownBounds.contains(visibleLayer.getLatLng())) {
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if (this.options.animateAddingMarkers) {
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this._animationAddLayer(layer, visibleLayer);
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} else {
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this._animationAddLayerNonAnimated(layer, visibleLayer);
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}
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}
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return this;
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},
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removeLayer: function (layer) {
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if (layer instanceof L.LayerGroup) {
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return this.removeLayers([layer]);
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}
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//Non point layers
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if (!layer.getLatLng) {
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this._nonPointGroup.removeLayer(layer);
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this.fire('layerremove', { layer: layer });
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return this;
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}
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if (!this._map) {
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if (!this._arraySplice(this._needsClustering, layer) && this.hasLayer(layer)) {
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this._needsRemoving.push({ layer: layer, latlng: layer._latlng });
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}
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this.fire('layerremove', { layer: layer });
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return this;
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}
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if (!layer.__parent) {
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return this;
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}
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if (this._unspiderfy) {
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this._unspiderfy();
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this._unspiderfyLayer(layer);
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}
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//Remove the marker from clusters
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this._removeLayer(layer, true);
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this.fire('layerremove', { layer: layer });
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// Refresh bounds and weighted positions.
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this._topClusterLevel._recalculateBounds();
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this._refreshClustersIcons();
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layer.off(this._childMarkerEventHandlers, this);
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if (this._featureGroup.hasLayer(layer)) {
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this._featureGroup.removeLayer(layer);
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if (layer.clusterShow) {
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layer.clusterShow();
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}
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}
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return this;
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},
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//Takes an array of markers and adds them in bulk
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addLayers: function (layersArray, skipLayerAddEvent) {
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if (!L.Util.isArray(layersArray)) {
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return this.addLayer(layersArray);
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}
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var fg = this._featureGroup,
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npg = this._nonPointGroup,
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chunked = this.options.chunkedLoading,
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chunkInterval = this.options.chunkInterval,
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chunkProgress = this.options.chunkProgress,
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l = layersArray.length,
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offset = 0,
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originalArray = true,
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m;
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if (this._map) {
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var started = (new Date()).getTime();
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var process = L.bind(function () {
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var start = (new Date()).getTime();
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// Make sure to unspiderfy before starting to add some layers
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if (this._map && this._unspiderfy) {
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this._unspiderfy();
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}
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for (; offset < l; offset++) {
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if (chunked && offset % 200 === 0) {
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// every couple hundred markers, instrument the time elapsed since processing started:
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var elapsed = (new Date()).getTime() - start;
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if (elapsed > chunkInterval) {
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break; // been working too hard, time to take a break :-)
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}
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}
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m = layersArray[offset];
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// Group of layers, append children to layersArray and skip.
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// Side effects:
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// - Total increases, so chunkProgress ratio jumps backward.
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// - Groups are not included in this group, only their non-group child layers (hasLayer).
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// Changing array length while looping does not affect performance in current browsers:
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// http://jsperf.com/for-loop-changing-length/6
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if (m instanceof L.LayerGroup) {
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if (originalArray) {
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layersArray = layersArray.slice();
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originalArray = false;
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}
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this._extractNonGroupLayers(m, layersArray);
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l = layersArray.length;
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continue;
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}
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//Not point data, can't be clustered
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if (!m.getLatLng) {
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npg.addLayer(m);
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if (!skipLayerAddEvent) {
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this.fire('layeradd', { layer: m });
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}
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continue;
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}
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if (this.hasLayer(m)) {
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continue;
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}
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this._addLayer(m, this._maxZoom);
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if (!skipLayerAddEvent) {
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this.fire('layeradd', { layer: m });
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}
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//If we just made a cluster of size 2 then we need to remove the other marker from the map (if it is) or we never will
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if (m.__parent) {
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if (m.__parent.getChildCount() === 2) {
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var markers = m.__parent.getAllChildMarkers(),
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otherMarker = markers[0] === m ? markers[1] : markers[0];
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fg.removeLayer(otherMarker);
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}
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}
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}
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if (chunkProgress) {
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// report progress and time elapsed:
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chunkProgress(offset, l, (new Date()).getTime() - started);
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}
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// Completed processing all markers.
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if (offset === l) {
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// Refresh bounds and weighted positions.
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this._topClusterLevel._recalculateBounds();
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this._refreshClustersIcons();
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this._topClusterLevel._recursivelyAddChildrenToMap(null, this._zoom, this._currentShownBounds);
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} else {
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setTimeout(process, this.options.chunkDelay);
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}
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}, this);
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process();
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} else {
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var needsClustering = this._needsClustering;
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for (; offset < l; offset++) {
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m = layersArray[offset];
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// Group of layers, append children to layersArray and skip.
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if (m instanceof L.LayerGroup) {
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if (originalArray) {
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layersArray = layersArray.slice();
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originalArray = false;
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}
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this._extractNonGroupLayers(m, layersArray);
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l = layersArray.length;
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continue;
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}
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//Not point data, can't be clustered
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if (!m.getLatLng) {
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npg.addLayer(m);
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continue;
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}
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if (this.hasLayer(m)) {
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continue;
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}
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needsClustering.push(m);
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}
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}
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return this;
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},
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//Takes an array of markers and removes them in bulk
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removeLayers: function (layersArray) {
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var i, m,
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l = layersArray.length,
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fg = this._featureGroup,
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npg = this._nonPointGroup,
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originalArray = true;
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if (!this._map) {
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for (i = 0; i < l; i++) {
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m = layersArray[i];
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// Group of layers, append children to layersArray and skip.
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if (m instanceof L.LayerGroup) {
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if (originalArray) {
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layersArray = layersArray.slice();
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originalArray = false;
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}
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this._extractNonGroupLayers(m, layersArray);
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l = layersArray.length;
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continue;
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}
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this._arraySplice(this._needsClustering, m);
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npg.removeLayer(m);
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if (this.hasLayer(m)) {
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this._needsRemoving.push({ layer: m, latlng: m._latlng });
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}
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this.fire('layerremove', { layer: m });
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}
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return this;
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}
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if (this._unspiderfy) {
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this._unspiderfy();
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// Work on a copy of the array, so that next loop is not affected.
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var layersArray2 = layersArray.slice(),
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l2 = l;
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for (i = 0; i < l2; i++) {
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m = layersArray2[i];
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// Group of layers, append children to layersArray and skip.
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if (m instanceof L.LayerGroup) {
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this._extractNonGroupLayers(m, layersArray2);
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l2 = layersArray2.length;
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continue;
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}
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this._unspiderfyLayer(m);
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}
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}
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for (i = 0; i < l; i++) {
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m = layersArray[i];
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// Group of layers, append children to layersArray and skip.
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if (m instanceof L.LayerGroup) {
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if (originalArray) {
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layersArray = layersArray.slice();
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originalArray = false;
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}
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this._extractNonGroupLayers(m, layersArray);
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l = layersArray.length;
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continue;
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}
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if (!m.__parent) {
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npg.removeLayer(m);
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this.fire('layerremove', { layer: m });
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continue;
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}
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this._removeLayer(m, true, true);
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this.fire('layerremove', { layer: m });
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if (fg.hasLayer(m)) {
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fg.removeLayer(m);
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if (m.clusterShow) {
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m.clusterShow();
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}
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}
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}
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// Refresh bounds and weighted positions.
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this._topClusterLevel._recalculateBounds();
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this._refreshClustersIcons();
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//Fix up the clusters and markers on the map
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this._topClusterLevel._recursivelyAddChildrenToMap(null, this._zoom, this._currentShownBounds);
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return this;
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},
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//Removes all layers from the MarkerClusterGroup
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clearLayers: function () {
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//Need our own special implementation as the LayerGroup one doesn't work for us
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//If we aren't on the map (yet), blow away the markers we know of
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if (!this._map) {
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this._needsClustering = [];
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this._needsRemoving = [];
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delete this._gridClusters;
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delete this._gridUnclustered;
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}
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if (this._noanimationUnspiderfy) {
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this._noanimationUnspiderfy();
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}
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//Remove all the visible layers
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this._featureGroup.clearLayers();
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this._nonPointGroup.clearLayers();
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this.eachLayer(function (marker) {
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marker.off(this._childMarkerEventHandlers, this);
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delete marker.__parent;
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}, this);
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if (this._map) {
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//Reset _topClusterLevel and the DistanceGrids
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this._generateInitialClusters();
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}
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return this;
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},
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//Override FeatureGroup.getBounds as it doesn't work
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getBounds: function () {
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var bounds = new L.LatLngBounds();
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if (this._topClusterLevel) {
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bounds.extend(this._topClusterLevel._bounds);
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}
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for (var i = this._needsClustering.length - 1; i >= 0; i--) {
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bounds.extend(this._needsClustering[i].getLatLng());
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}
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bounds.extend(this._nonPointGroup.getBounds());
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return bounds;
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},
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//Overrides LayerGroup.eachLayer
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eachLayer: function (method, context) {
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var markers = this._needsClustering.slice(),
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needsRemoving = this._needsRemoving,
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thisNeedsRemoving, i, j;
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if (this._topClusterLevel) {
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this._topClusterLevel.getAllChildMarkers(markers);
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}
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for (i = markers.length - 1; i >= 0; i--) {
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thisNeedsRemoving = true;
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for (j = needsRemoving.length - 1; j >= 0; j--) {
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if (needsRemoving[j].layer === markers[i]) {
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thisNeedsRemoving = false;
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break;
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}
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}
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if (thisNeedsRemoving) {
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method.call(context, markers[i]);
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}
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}
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this._nonPointGroup.eachLayer(method, context);
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},
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//Overrides LayerGroup.getLayers
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getLayers: function () {
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var layers = [];
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this.eachLayer(function (l) {
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layers.push(l);
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});
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return layers;
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},
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//Overrides LayerGroup.getLayer, WARNING: Really bad performance
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getLayer: function (id) {
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var result = null;
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id = parseInt(id, 10);
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this.eachLayer(function (l) {
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if (L.stamp(l) === id) {
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result = l;
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}
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});
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return result;
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},
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//Returns true if the given layer is in this MarkerClusterGroup
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hasLayer: function (layer) {
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if (!layer) {
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return false;
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}
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var i, anArray = this._needsClustering;
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for (i = anArray.length - 1; i >= 0; i--) {
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if (anArray[i] === layer) {
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return true;
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}
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}
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anArray = this._needsRemoving;
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for (i = anArray.length - 1; i >= 0; i--) {
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if (anArray[i].layer === layer) {
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return false;
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}
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}
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return !!(layer.__parent && layer.__parent._group === this) || this._nonPointGroup.hasLayer(layer);
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},
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//Zoom down to show the given layer (spiderfying if necessary) then calls the callback
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zoomToShowLayer: function (layer, callback) {
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var map = this._map;
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if (typeof callback !== 'function') {
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callback = function () {};
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}
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var showMarker = function () {
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// Assumes that map.hasLayer checks for direct appearance on map, not recursively calling
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// hasLayer on Layer Groups that are on map (typically not calling this MarkerClusterGroup.hasLayer, which would always return true)
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if ((map.hasLayer(layer) || map.hasLayer(layer.__parent)) && !this._inZoomAnimation) {
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this._map.off('moveend', showMarker, this);
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this.off('animationend', showMarker, this);
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if (map.hasLayer(layer)) {
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callback();
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} else if (layer.__parent._icon) {
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this.once('spiderfied', callback, this);
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layer.__parent.spiderfy();
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}
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}
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};
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if (layer._icon && this._map.getBounds().contains(layer.getLatLng())) {
|
|
//Layer is visible ond on screen, immediate return
|
|
callback();
|
|
} else if (layer.__parent._zoom < Math.round(this._map._zoom)) {
|
|
//Layer should be visible at this zoom level. It must not be on screen so just pan over to it
|
|
this._map.on('moveend', showMarker, this);
|
|
this._map.panTo(layer.getLatLng());
|
|
} else {
|
|
this._map.on('moveend', showMarker, this);
|
|
this.on('animationend', showMarker, this);
|
|
layer.__parent.zoomToBounds();
|
|
}
|
|
},
|
|
|
|
//Overrides FeatureGroup.onAdd
|
|
onAdd: function (map) {
|
|
this._map = map;
|
|
var i, l, layer;
|
|
|
|
if (!isFinite(this._map.getMaxZoom())) {
|
|
throw "Map has no maxZoom specified";
|
|
}
|
|
|
|
this._featureGroup.addTo(map);
|
|
this._nonPointGroup.addTo(map);
|
|
|
|
if (!this._gridClusters) {
|
|
this._generateInitialClusters();
|
|
}
|
|
|
|
this._maxLat = map.options.crs.projection.MAX_LATITUDE;
|
|
|
|
//Restore all the positions as they are in the MCG before removing them
|
|
for (i = 0, l = this._needsRemoving.length; i < l; i++) {
|
|
layer = this._needsRemoving[i];
|
|
layer.newlatlng = layer.layer._latlng;
|
|
layer.layer._latlng = layer.latlng;
|
|
}
|
|
//Remove them, then restore their new positions
|
|
for (i = 0, l = this._needsRemoving.length; i < l; i++) {
|
|
layer = this._needsRemoving[i];
|
|
this._removeLayer(layer.layer, true);
|
|
layer.layer._latlng = layer.newlatlng;
|
|
}
|
|
this._needsRemoving = [];
|
|
|
|
//Remember the current zoom level and bounds
|
|
this._zoom = Math.round(this._map._zoom);
|
|
this._currentShownBounds = this._getExpandedVisibleBounds();
|
|
|
|
this._map.on('zoomend', this._zoomEnd, this);
|
|
this._map.on('moveend', this._moveEnd, this);
|
|
|
|
if (this._spiderfierOnAdd) { //TODO FIXME: Not sure how to have spiderfier add something on here nicely
|
|
this._spiderfierOnAdd();
|
|
}
|
|
|
|
this._bindEvents();
|
|
|
|
//Actually add our markers to the map:
|
|
l = this._needsClustering;
|
|
this._needsClustering = [];
|
|
this.addLayers(l, true);
|
|
},
|
|
|
|
//Overrides FeatureGroup.onRemove
|
|
onRemove: function (map) {
|
|
map.off('zoomend', this._zoomEnd, this);
|
|
map.off('moveend', this._moveEnd, this);
|
|
|
|
this._unbindEvents();
|
|
|
|
//In case we are in a cluster animation
|
|
this._map._mapPane.className = this._map._mapPane.className.replace(' leaflet-cluster-anim', '');
|
|
|
|
if (this._spiderfierOnRemove) { //TODO FIXME: Not sure how to have spiderfier add something on here nicely
|
|
this._spiderfierOnRemove();
|
|
}
|
|
|
|
delete this._maxLat;
|
|
|
|
//Clean up all the layers we added to the map
|
|
this._hideCoverage();
|
|
this._featureGroup.remove();
|
|
this._nonPointGroup.remove();
|
|
|
|
this._featureGroup.clearLayers();
|
|
|
|
this._map = null;
|
|
},
|
|
|
|
getVisibleParent: function (marker) {
|
|
var vMarker = marker;
|
|
while (vMarker && !vMarker._icon) {
|
|
vMarker = vMarker.__parent;
|
|
}
|
|
return vMarker || null;
|
|
},
|
|
|
|
//Remove the given object from the given array
|
|
_arraySplice: function (anArray, obj) {
|
|
for (var i = anArray.length - 1; i >= 0; i--) {
|
|
if (anArray[i] === obj) {
|
|
anArray.splice(i, 1);
|
|
return true;
|
|
}
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Removes a marker from all _gridUnclustered zoom levels, starting at the supplied zoom.
|
|
* @param marker to be removed from _gridUnclustered.
|
|
* @param z integer bottom start zoom level (included)
|
|
* @private
|
|
*/
|
|
_removeFromGridUnclustered: function (marker, z) {
|
|
var map = this._map,
|
|
gridUnclustered = this._gridUnclustered,
|
|
minZoom = Math.floor(this._map.getMinZoom());
|
|
|
|
for (; z >= minZoom; z--) {
|
|
if (!gridUnclustered[z].removeObject(marker, map.project(marker.getLatLng(), z))) {
|
|
break;
|
|
}
|
|
}
|
|
},
|
|
|
|
_childMarkerDragStart: function (e) {
|
|
e.target.__dragStart = e.target._latlng;
|
|
},
|
|
|
|
_childMarkerMoved: function (e) {
|
|
if (!this._ignoreMove && !e.target.__dragStart) {
|
|
var isPopupOpen = e.target._popup && e.target._popup.isOpen();
|
|
|
|
this._moveChild(e.target, e.oldLatLng, e.latlng);
|
|
|
|
if (isPopupOpen) {
|
|
e.target.openPopup();
|
|
}
|
|
}
|
|
},
|
|
|
|
_moveChild: function (layer, from, to) {
|
|
layer._latlng = from;
|
|
this.removeLayer(layer);
|
|
|
|
layer._latlng = to;
|
|
this.addLayer(layer);
|
|
},
|
|
|
|
_childMarkerDragEnd: function (e) {
|
|
var dragStart = e.target.__dragStart;
|
|
delete e.target.__dragStart;
|
|
if (dragStart) {
|
|
this._moveChild(e.target, dragStart, e.target._latlng);
|
|
}
|
|
},
|
|
|
|
|
|
//Internal function for removing a marker from everything.
|
|
//dontUpdateMap: set to true if you will handle updating the map manually (for bulk functions)
|
|
_removeLayer: function (marker, removeFromDistanceGrid, dontUpdateMap) {
|
|
var gridClusters = this._gridClusters,
|
|
gridUnclustered = this._gridUnclustered,
|
|
fg = this._featureGroup,
|
|
map = this._map,
|
|
minZoom = Math.floor(this._map.getMinZoom());
|
|
|
|
//Remove the marker from distance clusters it might be in
|
|
if (removeFromDistanceGrid) {
|
|
this._removeFromGridUnclustered(marker, this._maxZoom);
|
|
}
|
|
|
|
//Work our way up the clusters removing them as we go if required
|
|
var cluster = marker.__parent,
|
|
markers = cluster._markers,
|
|
otherMarker;
|
|
|
|
//Remove the marker from the immediate parents marker list
|
|
this._arraySplice(markers, marker);
|
|
|
|
while (cluster) {
|
|
cluster._childCount--;
|
|
cluster._boundsNeedUpdate = true;
|
|
|
|
if (cluster._zoom < minZoom) {
|
|
//Top level, do nothing
|
|
break;
|
|
} else if (removeFromDistanceGrid && cluster._childCount <= 1) { //Cluster no longer required
|
|
//We need to push the other marker up to the parent
|
|
otherMarker = cluster._markers[0] === marker ? cluster._markers[1] : cluster._markers[0];
|
|
|
|
//Update distance grid
|
|
gridClusters[cluster._zoom].removeObject(cluster, map.project(cluster._cLatLng, cluster._zoom));
|
|
gridUnclustered[cluster._zoom].addObject(otherMarker, map.project(otherMarker.getLatLng(), cluster._zoom));
|
|
|
|
//Move otherMarker up to parent
|
|
this._arraySplice(cluster.__parent._childClusters, cluster);
|
|
cluster.__parent._markers.push(otherMarker);
|
|
otherMarker.__parent = cluster.__parent;
|
|
|
|
if (cluster._icon) {
|
|
//Cluster is currently on the map, need to put the marker on the map instead
|
|
fg.removeLayer(cluster);
|
|
if (!dontUpdateMap) {
|
|
fg.addLayer(otherMarker);
|
|
}
|
|
}
|
|
} else {
|
|
cluster._iconNeedsUpdate = true;
|
|
}
|
|
|
|
cluster = cluster.__parent;
|
|
}
|
|
|
|
delete marker.__parent;
|
|
},
|
|
|
|
_isOrIsParent: function (el, oel) {
|
|
while (oel) {
|
|
if (el === oel) {
|
|
return true;
|
|
}
|
|
oel = oel.parentNode;
|
|
}
|
|
return false;
|
|
},
|
|
|
|
//Override L.Evented.fire
|
|
fire: function (type, data, propagate) {
|
|
if (data && data.layer instanceof L.MarkerCluster) {
|
|
//Prevent multiple clustermouseover/off events if the icon is made up of stacked divs (Doesn't work in ie <= 8, no relatedTarget)
|
|
if (data.originalEvent && this._isOrIsParent(data.layer._icon, data.originalEvent.relatedTarget)) {
|
|
return;
|
|
}
|
|
type = 'cluster' + type;
|
|
}
|
|
|
|
L.FeatureGroup.prototype.fire.call(this, type, data, propagate);
|
|
},
|
|
|
|
//Override L.Evented.listens
|
|
listens: function (type, propagate) {
|
|
return L.FeatureGroup.prototype.listens.call(this, type, propagate) || L.FeatureGroup.prototype.listens.call(this, 'cluster' + type, propagate);
|
|
},
|
|
|
|
//Default functionality
|
|
_defaultIconCreateFunction: function (cluster) {
|
|
var childCount = cluster.getChildCount();
|
|
|
|
var c = ' marker-cluster-';
|
|
if (childCount < 10) {
|
|
c += 'small';
|
|
} else if (childCount < 100) {
|
|
c += 'medium';
|
|
} else {
|
|
c += 'large';
|
|
}
|
|
|
|
return new L.DivIcon({ html: '<div><span>' + childCount + ' <span aria-label="markers"></span>' + '</span></div>', className: 'marker-cluster' + c, iconSize: new L.Point(40, 40) });
|
|
},
|
|
|
|
_bindEvents: function () {
|
|
var map = this._map,
|
|
spiderfyOnMaxZoom = this.options.spiderfyOnMaxZoom,
|
|
showCoverageOnHover = this.options.showCoverageOnHover,
|
|
zoomToBoundsOnClick = this.options.zoomToBoundsOnClick,
|
|
spiderfyOnEveryZoom = this.options.spiderfyOnEveryZoom;
|
|
|
|
//Zoom on cluster click or spiderfy if we are at the lowest level
|
|
if (spiderfyOnMaxZoom || zoomToBoundsOnClick || spiderfyOnEveryZoom) {
|
|
this.on('clusterclick clusterkeypress', this._zoomOrSpiderfy, this);
|
|
}
|
|
|
|
//Show convex hull (boundary) polygon on mouse over
|
|
if (showCoverageOnHover) {
|
|
this.on('clustermouseover', this._showCoverage, this);
|
|
this.on('clustermouseout', this._hideCoverage, this);
|
|
map.on('zoomend', this._hideCoverage, this);
|
|
}
|
|
},
|
|
|
|
_zoomOrSpiderfy: function (e) {
|
|
var cluster = e.layer,
|
|
bottomCluster = cluster;
|
|
|
|
if (e.type === 'clusterkeypress' && e.originalEvent && e.originalEvent.keyCode !== 13) {
|
|
return;
|
|
}
|
|
|
|
while (bottomCluster._childClusters.length === 1) {
|
|
bottomCluster = bottomCluster._childClusters[0];
|
|
}
|
|
|
|
if (bottomCluster._zoom === this._maxZoom &&
|
|
bottomCluster._childCount === cluster._childCount &&
|
|
this.options.spiderfyOnMaxZoom) {
|
|
|
|
// All child markers are contained in a single cluster from this._maxZoom to this cluster.
|
|
cluster.spiderfy();
|
|
} else if (this.options.zoomToBoundsOnClick) {
|
|
cluster.zoomToBounds();
|
|
}
|
|
|
|
if (this.options.spiderfyOnEveryZoom) {
|
|
cluster.spiderfy();
|
|
}
|
|
|
|
// Focus the map again for keyboard users.
|
|
if (e.originalEvent && e.originalEvent.keyCode === 13) {
|
|
this._map._container.focus();
|
|
}
|
|
},
|
|
|
|
_showCoverage: function (e) {
|
|
var map = this._map;
|
|
if (this._inZoomAnimation) {
|
|
return;
|
|
}
|
|
if (this._shownPolygon) {
|
|
map.removeLayer(this._shownPolygon);
|
|
}
|
|
if (e.layer.getChildCount() > 2 && e.layer !== this._spiderfied) {
|
|
this._shownPolygon = new L.Polygon(e.layer.getConvexHull(), this.options.polygonOptions);
|
|
map.addLayer(this._shownPolygon);
|
|
}
|
|
},
|
|
|
|
_hideCoverage: function () {
|
|
if (this._shownPolygon) {
|
|
this._map.removeLayer(this._shownPolygon);
|
|
this._shownPolygon = null;
|
|
}
|
|
},
|
|
|
|
_unbindEvents: function () {
|
|
var spiderfyOnMaxZoom = this.options.spiderfyOnMaxZoom,
|
|
showCoverageOnHover = this.options.showCoverageOnHover,
|
|
zoomToBoundsOnClick = this.options.zoomToBoundsOnClick,
|
|
spiderfyOnEveryZoom = this.options.spiderfyOnEveryZoom,
|
|
map = this._map;
|
|
|
|
if (spiderfyOnMaxZoom || zoomToBoundsOnClick || spiderfyOnEveryZoom) {
|
|
this.off('clusterclick clusterkeypress', this._zoomOrSpiderfy, this);
|
|
}
|
|
if (showCoverageOnHover) {
|
|
this.off('clustermouseover', this._showCoverage, this);
|
|
this.off('clustermouseout', this._hideCoverage, this);
|
|
map.off('zoomend', this._hideCoverage, this);
|
|
}
|
|
},
|
|
|
|
_zoomEnd: function () {
|
|
if (!this._map) { //May have been removed from the map by a zoomEnd handler
|
|
return;
|
|
}
|
|
this._mergeSplitClusters();
|
|
|
|
this._zoom = Math.round(this._map._zoom);
|
|
this._currentShownBounds = this._getExpandedVisibleBounds();
|
|
},
|
|
|
|
_moveEnd: function () {
|
|
if (this._inZoomAnimation) {
|
|
return;
|
|
}
|
|
|
|
var newBounds = this._getExpandedVisibleBounds();
|
|
|
|
this._topClusterLevel._recursivelyRemoveChildrenFromMap(this._currentShownBounds, Math.floor(this._map.getMinZoom()), this._zoom, newBounds);
|
|
this._topClusterLevel._recursivelyAddChildrenToMap(null, Math.round(this._map._zoom), newBounds);
|
|
|
|
this._currentShownBounds = newBounds;
|
|
return;
|
|
},
|
|
|
|
_generateInitialClusters: function () {
|
|
var maxZoom = Math.ceil(this._map.getMaxZoom()),
|
|
minZoom = Math.floor(this._map.getMinZoom()),
|
|
radius = this.options.maxClusterRadius,
|
|
radiusFn = radius;
|
|
|
|
//If we just set maxClusterRadius to a single number, we need to create
|
|
//a simple function to return that number. Otherwise, we just have to
|
|
//use the function we've passed in.
|
|
if (typeof radius !== "function") {
|
|
radiusFn = function () { return radius; };
|
|
}
|
|
|
|
if (this.options.disableClusteringAtZoom !== null) {
|
|
maxZoom = this.options.disableClusteringAtZoom - 1;
|
|
}
|
|
this._maxZoom = maxZoom;
|
|
this._gridClusters = {};
|
|
this._gridUnclustered = {};
|
|
|
|
//Set up DistanceGrids for each zoom
|
|
|
|
if (!isFinite(maxZoom) ) {
|
|
throw "Map has no maxZoom specified";
|
|
}
|
|
if (!isFinite(minZoom)) {
|
|
throw "Map has no minZoom specified";
|
|
}
|
|
for (var zoom = maxZoom; zoom >= minZoom; zoom--) {
|
|
this._gridClusters[zoom] = new L.DistanceGrid(radiusFn(zoom));
|
|
this._gridUnclustered[zoom] = new L.DistanceGrid(radiusFn(zoom));
|
|
}
|
|
|
|
// Instantiate the appropriate L.MarkerCluster class (animated or not).
|
|
this._topClusterLevel = new this._markerCluster(this, minZoom - 1);
|
|
},
|
|
|
|
//Zoom: Zoom to start adding at (Pass this._maxZoom to start at the bottom)
|
|
_addLayer: function (layer, zoom) {
|
|
var gridClusters = this._gridClusters,
|
|
gridUnclustered = this._gridUnclustered,
|
|
minZoom = Math.floor(this._map.getMinZoom()),
|
|
markerPoint, z;
|
|
|
|
if (this.options.singleMarkerMode) {
|
|
this._overrideMarkerIcon(layer);
|
|
}
|
|
|
|
layer.on(this._childMarkerEventHandlers, this);
|
|
|
|
//Find the lowest zoom level to slot this one in
|
|
for (; zoom >= minZoom; zoom--) {
|
|
markerPoint = this._map.project(layer.getLatLng(), zoom); // calculate pixel position
|
|
|
|
//Try find a cluster close by
|
|
var closest = gridClusters[zoom].getNearObject(markerPoint);
|
|
if (closest) {
|
|
closest._addChild(layer);
|
|
layer.__parent = closest;
|
|
return;
|
|
}
|
|
|
|
//Try find a marker close by to form a new cluster with
|
|
closest = gridUnclustered[zoom].getNearObject(markerPoint);
|
|
if (closest) {
|
|
var parent = closest.__parent;
|
|
if (parent) {
|
|
this._removeLayer(closest, false);
|
|
}
|
|
|
|
//Create new cluster with these 2 in it
|
|
|
|
var newCluster = new this._markerCluster(this, zoom, closest, layer);
|
|
gridClusters[zoom].addObject(newCluster, this._map.project(newCluster._cLatLng, zoom));
|
|
closest.__parent = newCluster;
|
|
layer.__parent = newCluster;
|
|
|
|
//First create any new intermediate parent clusters that don't exist
|
|
var lastParent = newCluster;
|
|
for (z = zoom - 1; z > parent._zoom; z--) {
|
|
lastParent = new this._markerCluster(this, z, lastParent);
|
|
gridClusters[z].addObject(lastParent, this._map.project(closest.getLatLng(), z));
|
|
}
|
|
parent._addChild(lastParent);
|
|
|
|
//Remove closest from this zoom level and any above that it is in, replace with newCluster
|
|
this._removeFromGridUnclustered(closest, zoom);
|
|
|
|
return;
|
|
}
|
|
|
|
//Didn't manage to cluster in at this zoom, record us as a marker here and continue upwards
|
|
gridUnclustered[zoom].addObject(layer, markerPoint);
|
|
}
|
|
|
|
//Didn't get in anything, add us to the top
|
|
this._topClusterLevel._addChild(layer);
|
|
layer.__parent = this._topClusterLevel;
|
|
return;
|
|
},
|
|
|
|
/**
|
|
* Refreshes the icon of all "dirty" visible clusters.
|
|
* Non-visible "dirty" clusters will be updated when they are added to the map.
|
|
* @private
|
|
*/
|
|
_refreshClustersIcons: function () {
|
|
this._featureGroup.eachLayer(function (c) {
|
|
if (c instanceof L.MarkerCluster && c._iconNeedsUpdate) {
|
|
c._updateIcon();
|
|
}
|
|
});
|
|
},
|
|
|
|
//Enqueue code to fire after the marker expand/contract has happened
|
|
_enqueue: function (fn) {
|
|
this._queue.push(fn);
|
|
if (!this._queueTimeout) {
|
|
this._queueTimeout = setTimeout(L.bind(this._processQueue, this), 300);
|
|
}
|
|
},
|
|
_processQueue: function () {
|
|
for (var i = 0; i < this._queue.length; i++) {
|
|
this._queue[i].call(this);
|
|
}
|
|
this._queue.length = 0;
|
|
clearTimeout(this._queueTimeout);
|
|
this._queueTimeout = null;
|
|
},
|
|
|
|
//Merge and split any existing clusters that are too big or small
|
|
_mergeSplitClusters: function () {
|
|
var mapZoom = Math.round(this._map._zoom);
|
|
|
|
//In case we are starting to split before the animation finished
|
|
this._processQueue();
|
|
|
|
if (this._zoom < mapZoom && this._currentShownBounds.intersects(this._getExpandedVisibleBounds())) { //Zoom in, split
|
|
this._animationStart();
|
|
//Remove clusters now off screen
|
|
this._topClusterLevel._recursivelyRemoveChildrenFromMap(this._currentShownBounds, Math.floor(this._map.getMinZoom()), this._zoom, this._getExpandedVisibleBounds());
|
|
|
|
this._animationZoomIn(this._zoom, mapZoom);
|
|
|
|
} else if (this._zoom > mapZoom) { //Zoom out, merge
|
|
this._animationStart();
|
|
|
|
this._animationZoomOut(this._zoom, mapZoom);
|
|
} else {
|
|
this._moveEnd();
|
|
}
|
|
},
|
|
|
|
//Gets the maps visible bounds expanded in each direction by the size of the screen (so the user cannot see an area we do not cover in one pan)
|
|
_getExpandedVisibleBounds: function () {
|
|
if (!this.options.removeOutsideVisibleBounds) {
|
|
return this._mapBoundsInfinite;
|
|
} else if (L.Browser.mobile) {
|
|
return this._checkBoundsMaxLat(this._map.getBounds());
|
|
}
|
|
|
|
return this._checkBoundsMaxLat(this._map.getBounds().pad(1)); // Padding expands the bounds by its own dimensions but scaled with the given factor.
|
|
},
|
|
|
|
/**
|
|
* Expands the latitude to Infinity (or -Infinity) if the input bounds reach the map projection maximum defined latitude
|
|
* (in the case of Web/Spherical Mercator, it is 85.0511287798 / see https://en.wikipedia.org/wiki/Web_Mercator#Formulas).
|
|
* Otherwise, the removeOutsideVisibleBounds option will remove markers beyond that limit, whereas the same markers without
|
|
* this option (or outside MCG) will have their position floored (ceiled) by the projection and rendered at that limit,
|
|
* making the user think that MCG "eats" them and never displays them again.
|
|
* @param bounds L.LatLngBounds
|
|
* @returns {L.LatLngBounds}
|
|
* @private
|
|
*/
|
|
_checkBoundsMaxLat: function (bounds) {
|
|
var maxLat = this._maxLat;
|
|
|
|
if (maxLat !== undefined) {
|
|
if (bounds.getNorth() >= maxLat) {
|
|
bounds._northEast.lat = Infinity;
|
|
}
|
|
if (bounds.getSouth() <= -maxLat) {
|
|
bounds._southWest.lat = -Infinity;
|
|
}
|
|
}
|
|
|
|
return bounds;
|
|
},
|
|
|
|
//Shared animation code
|
|
_animationAddLayerNonAnimated: function (layer, newCluster) {
|
|
if (newCluster === layer) {
|
|
this._featureGroup.addLayer(layer);
|
|
} else if (newCluster._childCount === 2) {
|
|
newCluster._addToMap();
|
|
|
|
var markers = newCluster.getAllChildMarkers();
|
|
this._featureGroup.removeLayer(markers[0]);
|
|
this._featureGroup.removeLayer(markers[1]);
|
|
} else {
|
|
newCluster._updateIcon();
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Extracts individual (i.e. non-group) layers from a Layer Group.
|
|
* @param group to extract layers from.
|
|
* @param output {Array} in which to store the extracted layers.
|
|
* @returns {*|Array}
|
|
* @private
|
|
*/
|
|
_extractNonGroupLayers: function (group, output) {
|
|
var layers = group.getLayers(),
|
|
i = 0,
|
|
layer;
|
|
|
|
output = output || [];
|
|
|
|
for (; i < layers.length; i++) {
|
|
layer = layers[i];
|
|
|
|
if (layer instanceof L.LayerGroup) {
|
|
this._extractNonGroupLayers(layer, output);
|
|
continue;
|
|
}
|
|
|
|
output.push(layer);
|
|
}
|
|
|
|
return output;
|
|
},
|
|
|
|
/**
|
|
* Implements the singleMarkerMode option.
|
|
* @param layer Marker to re-style using the Clusters iconCreateFunction.
|
|
* @returns {L.Icon} The newly created icon.
|
|
* @private
|
|
*/
|
|
_overrideMarkerIcon: function (layer) {
|
|
var icon = layer.options.icon = this.options.iconCreateFunction({
|
|
getChildCount: function () {
|
|
return 1;
|
|
},
|
|
getAllChildMarkers: function () {
|
|
return [layer];
|
|
}
|
|
});
|
|
|
|
return icon;
|
|
}
|
|
});
|
|
|
|
// Constant bounds used in case option "removeOutsideVisibleBounds" is set to false.
|
|
L.MarkerClusterGroup.include({
|
|
_mapBoundsInfinite: new L.LatLngBounds(new L.LatLng(-Infinity, -Infinity), new L.LatLng(Infinity, Infinity))
|
|
});
|
|
|
|
L.MarkerClusterGroup.include({
|
|
_noAnimation: {
|
|
//Non Animated versions of everything
|
|
_animationStart: function () {
|
|
//Do nothing...
|
|
},
|
|
_animationZoomIn: function (previousZoomLevel, newZoomLevel) {
|
|
this._topClusterLevel._recursivelyRemoveChildrenFromMap(this._currentShownBounds, Math.floor(this._map.getMinZoom()), previousZoomLevel);
|
|
this._topClusterLevel._recursivelyAddChildrenToMap(null, newZoomLevel, this._getExpandedVisibleBounds());
|
|
|
|
//We didn't actually animate, but we use this event to mean "clustering animations have finished"
|
|
this.fire('animationend');
|
|
},
|
|
_animationZoomOut: function (previousZoomLevel, newZoomLevel) {
|
|
this._topClusterLevel._recursivelyRemoveChildrenFromMap(this._currentShownBounds, Math.floor(this._map.getMinZoom()), previousZoomLevel);
|
|
this._topClusterLevel._recursivelyAddChildrenToMap(null, newZoomLevel, this._getExpandedVisibleBounds());
|
|
|
|
//We didn't actually animate, but we use this event to mean "clustering animations have finished"
|
|
this.fire('animationend');
|
|
},
|
|
_animationAddLayer: function (layer, newCluster) {
|
|
this._animationAddLayerNonAnimated(layer, newCluster);
|
|
}
|
|
},
|
|
|
|
_withAnimation: {
|
|
//Animated versions here
|
|
_animationStart: function () {
|
|
this._map._mapPane.className += ' leaflet-cluster-anim';
|
|
this._inZoomAnimation++;
|
|
},
|
|
|
|
_animationZoomIn: function (previousZoomLevel, newZoomLevel) {
|
|
var bounds = this._getExpandedVisibleBounds(),
|
|
fg = this._featureGroup,
|
|
minZoom = Math.floor(this._map.getMinZoom()),
|
|
i;
|
|
|
|
this._ignoreMove = true;
|
|
|
|
//Add all children of current clusters to map and remove those clusters from map
|
|
this._topClusterLevel._recursively(bounds, previousZoomLevel, minZoom, function (c) {
|
|
var startPos = c._latlng,
|
|
markers = c._markers,
|
|
m;
|
|
|
|
if (!bounds.contains(startPos)) {
|
|
startPos = null;
|
|
}
|
|
|
|
if (c._isSingleParent() && previousZoomLevel + 1 === newZoomLevel) { //Immediately add the new child and remove us
|
|
fg.removeLayer(c);
|
|
c._recursivelyAddChildrenToMap(null, newZoomLevel, bounds);
|
|
} else {
|
|
//Fade out old cluster
|
|
c.clusterHide();
|
|
c._recursivelyAddChildrenToMap(startPos, newZoomLevel, bounds);
|
|
}
|
|
|
|
//Remove all markers that aren't visible any more
|
|
//TODO: Do we actually need to do this on the higher levels too?
|
|
for (i = markers.length - 1; i >= 0; i--) {
|
|
m = markers[i];
|
|
if (!bounds.contains(m._latlng)) {
|
|
fg.removeLayer(m);
|
|
}
|
|
}
|
|
|
|
});
|
|
|
|
this._forceLayout();
|
|
|
|
//Update opacities
|
|
this._topClusterLevel._recursivelyBecomeVisible(bounds, newZoomLevel);
|
|
//TODO Maybe? Update markers in _recursivelyBecomeVisible
|
|
fg.eachLayer(function (n) {
|
|
if (!(n instanceof L.MarkerCluster) && n._icon) {
|
|
n.clusterShow();
|
|
}
|
|
});
|
|
|
|
//update the positions of the just added clusters/markers
|
|
this._topClusterLevel._recursively(bounds, previousZoomLevel, newZoomLevel, function (c) {
|
|
c._recursivelyRestoreChildPositions(newZoomLevel);
|
|
});
|
|
|
|
this._ignoreMove = false;
|
|
|
|
//Remove the old clusters and close the zoom animation
|
|
this._enqueue(function () {
|
|
//update the positions of the just added clusters/markers
|
|
this._topClusterLevel._recursively(bounds, previousZoomLevel, minZoom, function (c) {
|
|
fg.removeLayer(c);
|
|
c.clusterShow();
|
|
});
|
|
|
|
this._animationEnd();
|
|
});
|
|
},
|
|
|
|
_animationZoomOut: function (previousZoomLevel, newZoomLevel) {
|
|
this._animationZoomOutSingle(this._topClusterLevel, previousZoomLevel - 1, newZoomLevel);
|
|
|
|
//Need to add markers for those that weren't on the map before but are now
|
|
this._topClusterLevel._recursivelyAddChildrenToMap(null, newZoomLevel, this._getExpandedVisibleBounds());
|
|
//Remove markers that were on the map before but won't be now
|
|
this._topClusterLevel._recursivelyRemoveChildrenFromMap(this._currentShownBounds, Math.floor(this._map.getMinZoom()), previousZoomLevel, this._getExpandedVisibleBounds());
|
|
},
|
|
|
|
_animationAddLayer: function (layer, newCluster) {
|
|
var me = this,
|
|
fg = this._featureGroup;
|
|
|
|
fg.addLayer(layer);
|
|
if (newCluster !== layer) {
|
|
if (newCluster._childCount > 2) { //Was already a cluster
|
|
|
|
newCluster._updateIcon();
|
|
this._forceLayout();
|
|
this._animationStart();
|
|
|
|
layer._setPos(this._map.latLngToLayerPoint(newCluster.getLatLng()));
|
|
layer.clusterHide();
|
|
|
|
this._enqueue(function () {
|
|
fg.removeLayer(layer);
|
|
layer.clusterShow();
|
|
|
|
me._animationEnd();
|
|
});
|
|
|
|
} else { //Just became a cluster
|
|
this._forceLayout();
|
|
|
|
me._animationStart();
|
|
me._animationZoomOutSingle(newCluster, this._map.getMaxZoom(), this._zoom);
|
|
}
|
|
}
|
|
}
|
|
},
|
|
|
|
// Private methods for animated versions.
|
|
_animationZoomOutSingle: function (cluster, previousZoomLevel, newZoomLevel) {
|
|
var bounds = this._getExpandedVisibleBounds(),
|
|
minZoom = Math.floor(this._map.getMinZoom());
|
|
|
|
//Animate all of the markers in the clusters to move to their cluster center point
|
|
cluster._recursivelyAnimateChildrenInAndAddSelfToMap(bounds, minZoom, previousZoomLevel + 1, newZoomLevel);
|
|
|
|
var me = this;
|
|
|
|
//Update the opacity (If we immediately set it they won't animate)
|
|
this._forceLayout();
|
|
cluster._recursivelyBecomeVisible(bounds, newZoomLevel);
|
|
|
|
//TODO: Maybe use the transition timing stuff to make this more reliable
|
|
//When the animations are done, tidy up
|
|
this._enqueue(function () {
|
|
|
|
//This cluster stopped being a cluster before the timeout fired
|
|
if (cluster._childCount === 1) {
|
|
var m = cluster._markers[0];
|
|
//If we were in a cluster animation at the time then the opacity and position of our child could be wrong now, so fix it
|
|
this._ignoreMove = true;
|
|
m.setLatLng(m.getLatLng());
|
|
this._ignoreMove = false;
|
|
if (m.clusterShow) {
|
|
m.clusterShow();
|
|
}
|
|
} else {
|
|
cluster._recursively(bounds, newZoomLevel, minZoom, function (c) {
|
|
c._recursivelyRemoveChildrenFromMap(bounds, minZoom, previousZoomLevel + 1);
|
|
});
|
|
}
|
|
me._animationEnd();
|
|
});
|
|
},
|
|
|
|
_animationEnd: function () {
|
|
if (this._map) {
|
|
this._map._mapPane.className = this._map._mapPane.className.replace(' leaflet-cluster-anim', '');
|
|
}
|
|
this._inZoomAnimation--;
|
|
this.fire('animationend');
|
|
},
|
|
|
|
//Force a browser layout of stuff in the map
|
|
// Should apply the current opacity and location to all elements so we can update them again for an animation
|
|
_forceLayout: function () {
|
|
//In my testing this works, infact offsetWidth of any element seems to work.
|
|
//Could loop all this._layers and do this for each _icon if it stops working
|
|
|
|
L.Util.falseFn(document.body.offsetWidth);
|
|
}
|
|
});
|
|
|
|
L.markerClusterGroup = function (options) {
|
|
return new L.MarkerClusterGroup(options);
|
|
};
|