D3 Examples - first-blocks

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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="stylesheet" href="light.css">
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script>
​
var width = 960,
    height = 600;
​
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) throw 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)
    .enter().append("circle")
            //find the centroid of the county and put the dot there
      .attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
            //choose the radius size
      .attr("r", function(d) { return Math.sqrt(parseFloat(d.properties.profit)* 0.00005) });
});
​
</script>
​
    