D3 Examples - Improved Circle Pack Clustering

Improved Circle Pack Clustering - d3.carto

Improved quadtree clustering in d3.carto.map allows for more seamless integration with hierarchical D3 layouts like Pack & Tree.

If you set the .cluster() property of a cartoLayer to true, it will cluster bsaed on a precomputed quadtree. Along with clustering, it appends "children" attributes of every point, which allows it to be passed to a hierarchical layout, as is done here with circle-packing.

A hierarchical infoviz layout like circle-packing shows the hierarchical structure of clustered cities, so that you can get a sense not only of the density of cities, but also the distribution.

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<html xmlns="https://www.w3.org/1999/xhtml">
<head>
  <title>d3.carto.map - Improved Circle Pack Clustering</title>
  <meta charset="utf-8" />
    <link type="text/css" rel="stylesheet" href="d3map.css" />
    <link type="text/css" rel="stylesheet" href="https://raw.githubusercontent.com/emeeks/d3-carto-map/master/examples/example.css" />
</head>
<style>
  html,body {
    height: 100%;
    width: 100%;
    margin: 0;
  }
​
  #map {
    height: 100%;
    width: 100%;
    position: absolute;
  }
​
</style>
<script>
      function makeSomeMaps() {
    map = d3.carto.map();
​
    d3.select("#map").call(map);
    
    tileLayer = d3.carto.layer();
    tileLayer
    .type("tile")
    .path("elijahmeeks.map-azn21pbi")
    .label("Base")
    
    csvLayer = d3.carto.layer.csv();
    csvLayer
    .path("all_sites.csv")
    .label("CSV Points")
    .cssClass("pinkcircle")
    .renderMode("svg")
    .markerSize(2)
    .x("xcoord")
    .y("ycoord")
    .on("recluster", clusterPack)
    .cluster(true);
    
    map.addCartoLayer(tileLayer).addCartoLayer(csvLayer);
    map.centerOn([100,30],"latlong").setScale(3);
    
    function clusterPack() {
      clusterLayer = csvLayer.clusterLayer();
      clusterLayer.g().selectAll("g.marker").selectAll("*").remove();
​
      packChart = d3.layout.pack();
      packChart.size([15,15])
      .value(function(d) {return 1});
​
      clusterLayer.g().selectAll("g.marker")
      .each(function(d) {
        d3.select(this).selectAll("circle")
        .data(packChart(d))
        .enter()
        .append("circle")
        .style("stroke", "black")
        .style("stroke-width", function(p) {return p.leaf ? 0 : 1})
        .attr("cx", function(p) {return p.x - 5})
        .attr("cy", function(p) {return p.y - 5})
        .attr("r", function(p) {return p.r})
        .style("fill", function(p) {return p.leaf ? "darkred" : "#FFE6E6"})
​
      })
​
    }
​
  }
</script>
<body onload="makeSomeMaps()">
<div id="map"></div>
<footer>
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</script>
<script src="https://d3js.org/d3.geo.projection.v0.min.js" type="text/javascript">
</script>
<script src="/emeeks/f3105fda25ff785dc5ed/example/tile.js" type="text/javascript">
</script>
<script src="/emeeks/f3105fda25ff785dc5ed/example/d3.quadtiles.js" type="text/javascript">
</script>
<script src="/emeeks/f3105fda25ff785dc5ed/example/d3.geo.raster.js" type="text/javascript">
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