D3 Examples - Massachusetts Map

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    var w = 960;
    var h = 500;
    
    var canvas = d3.select("body").append("svg")
      .attr("width", w)
      .attr("height", h)
    
    d3.json("Massachusetts.JSON.txt", function(data){
     
     var center = [d3.geoCentroid(data)[0]-.25,d3.geoCentroid(data)[1]]
     
     var group = canvas.selectAll('g')
        .data(data.features)
        .enter()
        .append('g')
     
    var projection = d3.geoMercator()
        .center(center)
        .scale(12000)
        .translate([w/2,h/2]);
      
    var path = d3.geoPath().projection(projection);
      
    var areas = group.append("path")
        .attr("d", path)
        .attr("class", "areas")
        .attr("fill", "#4A777A");
      
    group.append("text")
        .attr("x", function (d) {return path.centroid(d)[0]})
        .attr("y", function (d) {return path.centroid(d)[1]})
        .attr("text-anchor", "middle")
        .attr("font-size", 10)
        .text(function (d) {return d.properties.name;})
 
//      canvas.append("text")
//       .text(center)
//       .attr("y", 200)
//       .attr("x", 120)
//       .attr("font-size", 36)
//       .attr("font-family", "monospace")
     })
​
​
​
  </script>
</body>
​
    