.block

## .block
license: gpl-3.0

## README.md

      
        

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              README.md
            
          
        
      
    
  
    A demo of TopoJSON on a U.S. counties shapefile from the U.S. census bureau.

  

  

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

path {
  fill: none;
  stroke: #000;
  stroke-width: .25px;
  stroke-linejoin: round;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var path = d3.geo.path();

var projection = path.projection();

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

d3.json("/mbostock/raw/4090846/us.json", function(error, us) {
  if (error) throw error;

  var tf = us.transform,
      kx = tf.scale[0],
      ky = tf.scale[1],
      dx = tf.translate[0],
      dy = tf.translate[1];

  svg.append("path")
      .datum(topojson.mesh(us))
      .attr("d", path);

  svg.selectAll("circle")
      .data(us.arcs)
    .enter().append("circle")
      .attr("transform", function(d) { return "translate(" + projection([d[0][0] * kx + dx, d[0][1] * ky + dy]) + ")"; })
      .attr("r", 1.25);
});

</script>

## thumbnail.png

      
        

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              thumbnail.png