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Last active August 29, 2015 14:06
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Feature Clustering - d3.carto
Raw
readme.md

Quadtree-based feature clustering in d3.carto.map.

This is an early example of how using the quadtrees generated with each layer could also be used with feature layers. This allows you to dynamically aggregate features based on zoom. Polygons are colored by their shared grouping at different zoom levels. This version uses centroids--the final version will likely either use bounding box solely or give the option for both.

See also simple point clustering and more advanced point clustering that leverages circle-packing.

This also uses a custom formatter for the infoboxes to give you the name of an unclustered feature and the number of features in a clustered region.

Raw
d3map.css
path,circle,rect,polygon,ellipse,line {
vector-effect: non-scaling-stroke;
}
svg, canvas {
top: 0;
}
#d3MapZoomBox {
position: absolute;
z-index: 10;
height: 100px;
width: 25px;
top: 10px;
right: 50px;
}
#d3MapZoomBox > button {
height:25px;
width: 25px;
line-height: 25px;
}
.d3MapControlsBox > button {
font-size:22px;
font-weight:900;
border: none;
height:25px;
width:25px;
background: rgba(35,31,32,.85);
color: white;
padding: 0;
cursor: pointer;
}
.d3MapControlsBox > button:hover {
background: black;
}
#d3MapPanBox {
position: absolute;
z-index: 10;
height: 100px;
width: 25px;
top: 60px;
right: 50px;
}
#d3MapPanBox > button {
height:25px;
width: 25px;
line-height: 25px;
}
#d3MapPanBox > button#left {
position: absolute;
left: -25px;
top: 10px;
}
#d3MapPanBox > button#right {
position: absolute;
right: -25px;
top: 10px;
}
#d3MapLayerBox {
position: relative;
z-index: 10;
height: 100px;
width: 120px;
top: 10px;
left: 10px;
overflow: auto;
color: white;
background: rgba(35,31,32,.85);
}
#d3MapLayerBox > div {
margin: 5px;
border: none;
}
#d3MapLayerBox ul {
list-style: none;
padding: 0;
margin: 0;
cursor: pointer;
}
#d3MapLayerBox li {
list-style: none;
padding: 0;
}
#d3MapLayerBox li:hover {
font-weight:700;
}
#d3MapLayerBox li input {
cursor: pointer;
}
div.d3MapModal {
position: absolute;
z-index: 11;
background: rgba(35,31,32,.90);
top: 50px;
left: 50px;
color: white;
max-width: 400px;
}
div.d3MapModalContent {
width:100%;
height: 100%;
overflow: auto;
}
div.d3MapModalContent > p {
padding: 0px 20px;
margin: 5px 0;
}
div.d3MapModalContent > h1 {
padding: 0px 20px;
font-size: 20px;
}
div.d3MapModalArrow {
content: "";
width: 0;
height: 0;
border-left: 20px solid transparent;
border-right: 20px solid transparent;
border-top: 20px solid rgba(35,31,32,.90);
position: absolute;
bottom: -20px;
left: 33px;
}
#d3MapSVG {
}
rect.minimap-extent {
fill: rgba(200,255,255,0.35);
stroke: black;
stroke-width: 2px;
stroke-dasharray: 5 5;
}
circle.newpoints {
fill: black;
stroke: red;
stroke-width: 2px;
}
path.newfeatures {
fill: steelblue;
fill-opacity: .5;
stroke: pink;
stroke-width: 2px;
}
Raw
index.html
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Quadtree-based Feature Clustering - d3.carto</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;
}
.country {
stroke: white;
}
.clustered {
stroke: red;
fill: orange;
}
</style>
<script>
function makeSomeMaps() {
pathSource = 0;
map = d3.carto.map();
d3.select("#map").call(map);
map.centerOn([-88,39],"latlong");
map.setScale(2);
clusterModal = d3.carto.modal();
clusterModal.formatter(clusterFormatter);
regionLayer = d3.carto.layer.geojson();
regionLayer
.path("world.geojson")
.label("Countries")
.cssClass("country")
.renderMode("svg")
.on("recluster", recolorClusters)
.cluster(true);
map.addCartoLayer(regionLayer);
map.refresh();
function recolorClusters() {
regionLayer.clusterLayer()
.clickableFeatures(true)
.modal(clusterModal);
var clusterColor = d3.scale.category20b();
regionLayer.clusterLayer().g()
.selectAll("path")
.style("fill", function(d,i) {return clusterColor(i%20)})
.style("stroke", function(d,i) {return d3.rgb(clusterColor(i%20)).darker()})
}
function clusterFormatter(d) {
var content = "";
if (d.properties.node) {
var content = "<h1>Clustered Region</h1><p> ("+d.properties.node._d3MapQuad.size + " Countries)</p>"
}
else {
content = "<h1>Country</h1><p>Name: " + d.properties.name + "</p>"
}
return content;
}
}
</script>
<body onload="makeSomeMaps()">
<div id="map">
</div>
<footer>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8" type="text/javascript"></script>
<script src="http://d3js.org/topojson.v1.min.js" type="text/javascript">
</script>
<script src="http://d3js.org/d3.geo.projection.v0.min.js" type="text/javascript">
</script>
<script src="http://bl.ocks.org/emeeks/raw/f3105fda25ff785dc5ed/tile.js" type="text/javascript">
</script>
<script src="http://bl.ocks.org/emeeks/raw/f3105fda25ff785dc5ed/d3.quadtiles.js" type="text/javascript">
</script>
<script src="http://bl.ocks.org/emeeks/raw/f3105fda25ff785dc5ed/d3.geo.raster.js" type="text/javascript">
</script>
<script src="https://rawgit.com/emeeks/d3-carto-map/master/d3.carto.map.js" type="text/javascript">
</script>
</footer>
</body>
</html>
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world.geojson
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