bubbleMapD3/index.html at master · b-chou/bubbleMapD3 · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<style>

path {
  fill: none;
  stroke: #000;
  stroke-linejoin: round;
  stroke-linecap: round;
}

</style>
<body>
<script src="d3.js" ></script>
<link rel='stylesheet' type='text/css' href='styles.css'>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.js"></script>
<script>

var width = 960,
    height = 600;
var radius = d3.scale.sqrt()
    .domain([0, 1e6])
    .range([0, 15]);
var formatNumber = d3.format(",.0f");
var path = d3.geo.path()
    .projection(null);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
d3.json("us.json", function(error, us) {
  if (error) return console.error(error);

svg.append("path")
    .datum(topojson.feature(us, us.objects.nation))
    .attr("class", "land")
    .attr("d", path);

svg.append("path")
    .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))
    .attr("class", "border border--state")
    .attr("d", path);

svg.append("g")
    .attr("class", "bubble")
  .selectAll("circle")
    .data(topojson.feature(us, us.objects.counties).features
      .sort(function(a, b) { return b.properties.population - a.properties.population; }))
  .enter().append("circle")
    .attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
    .attr("r", function(d) { return radius(d.properties.population); })
    .append("title")
      .text(function(d) {
        return d.properties.name
            + "\nPopulation " + formatNumber(d.properties.population);
});
});

var legend = svg.append("g")
    .attr("class", "legend")
    .attr("transform", "translate(" + (width - 50) + "," + (height - 20) + ")")
  .selectAll("g")
    .data([1e6, 3e6, 6e6])
  .enter().append("g");

legend.append("circle")
    .attr("cy", function(d) { return -radius(d); })
    .attr("r", radius);

legend.append("text")
    .attr("y", function(d) { return -2 * radius(d); })
    .attr("dy", "1.3em")
    .text(d3.format(".1s"));


</script>