D3 Examples - Clusters in workers

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<!DOCTYPE html>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=1024, user-scalable=no">
    <style>
      html { height: 100% }
      body { height: 100%; margin: 0; padding: 0;}
      #map{ height: 100% }
    
    </style>
  
    <link rel="stylesheet" href="https://cdn.leafletjs.com/leaflet-0.5.1/leaflet.css" />
​
<title>Clusters</title>
<div id="map"></div>
<script src="https://d3js.org/d3.v3.js"></script>
​
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.5.1/leaflet.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/mbostock/d3/5348d911938a0d1fdf43d7c86befbd908e431204/lib/colorbrewer/colorbrewer.js"></script>
<script src="https://cdn.jsdelivr.net/gh/caligatio/jssha/release-1.42/src/sha1.js"></script>
<script>
​
var m = L.map("map").setView([42.3164, -71.7],9);
​
//make the map
​
​
L.tileLayer("https://{s}.tile.stamen.com/watercolor/{z}/{x}/{y}.jpg",{minZoom:4,maxZoom:12,attribution:'Map tiles by <a href="https://stamen.com">Stamen Design</a>, <a href="https://creativecommons.org/licenses/by/3.0">CC BY 3.0</a> &mdash; Map data &copy; <a href="https://openstreetmap.org">OpenStreetMap</a> contributors, <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>'}).addTo(m);
    
//add a tileset 
​
var pts = L.layerGroup().addTo(m);
​
function Rtree(points,cb){
    points = points || [];
    
    var worker = new Worker('myWorker.js');
     worker.onmessage=function(event){
         cb(event.data);
     };
     worker.postMessage({action:"create",points:points});
    this.add = function(pts){
       worker.postMessage({action:"add",points:pts});
    };
    this.bbox=function(blat1,blng1,blat2,blng2){
        worker.postMessage({action:"bbox",bounds:[blat1,blng1,blat2,blng2]});
    };
    this.cluster=function(blat1,blng1,blat2,blng2){
    console.log({action:"cluster",bounds:[blat1,blng1,blat2,blng2],size:[m.getSize().y,m.getSize().x,80]});
        worker.postMessage({action:"cluster",bounds:[blat1,blng1,blat2,blng2],size:[m.getSize().y,m.getSize().x,80]});
    };
}
​
var qt, bbox;
​
function morePoints(lat,lng){
    //compute random points
    var randomLat = d3.random.normal(lat, .15),
    randomLng = d3.random.normal(lng, .5);
    var points = d3.range(600).map(function() { return [randomLat(), randomLng()]; });
    if(!qt){//if we don't have a quad tree make one
        qt = new Rtree(points,redoMap);
    }else{
        //else add it to the current
        qt.add(points);
    }
    redoBox(bbox);// update the map
}
function getHash(text){
    //this is very much overkill but to make sure the same random style goes in everytime
    var shaObj = new jsSHA(text, "TEXT");
    return parseInt(shaObj.getHash("SHA-1", "HEX").slice(0,10),16)%11;
}
​
​
function redoBox(p){
    p=p||[parseFloat(m.getBounds().toBBoxString().split(",")[1]),parseFloat(m.getBounds().toBBoxString().split(",")[0]),parseFloat(m.getBounds().toBBoxString().split(",")[3]),parseFloat(m.getBounds().toBBoxString().split(",")[2])];//make sure p is defined
    
    bbox=p;//update the bbox
    qt.cluster.apply(qt,p);
}
var p;
function redoMap(event){
    if(!Array.isArray(event)){
      p=event;  
      pts.clearLayers();
      event.points.forEach(function(v){//do the query
         pts.addLayer(L.circleMarker(v,{stroke:false,fillOpacity:0.8,radius:6,color:colorbrewer.Spectral[11][getHash(JSON.stringify(v))],clickable:false}));//turn it into a marker wiht a popup
    });
    event.clusters.forEach(
        function(v){//do the query
         pts.addLayer(
             L.polygon(v[1],{stroke:false,fillOpacity:0.8,color:colorbrewer.Spectral[11][getHash(JSON.stringify(v))]}
             ).bindPopup("size: "+v[0])
             );//turn it into a marker wiht a popup
    }
        )
      return;
    }
pts.clearLayers();//clear the map
    event.forEach(function(v){//do the query
         pts.addLayer(L.circleMarker(v,{stroke:false,fillOpacity:0.8,color:colorbrewer.Spectral[11][getHash(JSON.stringify(v))],clickable:false}));//turn it into a marker wiht a popup
    });
}
m.on("contextmenu moveend",function(){redoBox()});//so you can right click to add to map
​
var AddButton= L.Control.extend({//creating the buttons
    options: {
        position: 'bottomleft'
    },
    onAdd: function (map) {
        // create the control container with a particular class name
        var div = L.DomUtil.create('div','bgroup');
        var addButton = L.DomUtil.create('button', 'addStuff',div);
        addButton.type="button";
        addButton.innerHTML="Add More Points";
        L.DomEvent.addListener(addButton,"click",function(){
            morePoints(map.getCenter().lat,map.getCenter().lng);//make sure it's where you currently are.
            });
    morePoints(map.getCenter().lat,map.getCenter().lng);
        return div;
    }
});
//add them to the map
m.addControl(new AddButton());
​
//this is the box selection thingy
var BoxSelect = L.Map.BoxZoom.extend({
    
    _onMouseUp: function (e) {
        this._pane.removeChild(this._box);
        this._container.style.cursor = '';
​
        L.DomUtil.enableTextSelection();
​
        L.DomEvent
            .off(document, 'mousemove', this._onMouseMove)
            .off(document, 'mouseup', this._onMouseUp);
​
        var map = this._map,
            layerPoint = map.mouseEventToLayerPoint(e);
​
        if (this._startLayerPoint.equals(layerPoint)) { return; }
​
        var bounds = new L.LatLngBounds(
                map.layerPointToLatLng(this._startLayerPoint),
                map.layerPointToLatLng(layerPoint));
​
        map.fire("boxselectend", {
            boxSelectBounds: [bounds.getSouthWest().lat,bounds.getSouthWest().lng,bounds.getNorthEast().lat,bounds.getNorthEast().lng]
        });
    }
});
m.boxZoom.disable();//turn off  the defult behavior
var boxSelect = new BoxSelect(m);//new box select
boxSelect.enable();//add it
m.on("boxselectend",function(e){redoBox(e.boxSelectBounds);});//put the behavior in.
</script>
    