jeremycflin/.block

## .block
license: gpl-3.0

## README.md

      
    Raw
  

              README.md
            
          
    This symbol map encodes the area of each county using a circle at the county's centroid.
forked from mbostock's block: County Circles

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

circle {
  fill: none;
  stroke: steelblue;
}

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

d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us.json", function(error, us) {
  if (error) throw error;

  svg.selectAll("circle")
      .data(topojson.feature(us, us.objects.counties).features)
    .enter().append("circle")
      .attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
      .attr("r", function(d) { return Math.sqrt(path.area(d) / Math.PI); });
});

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

	circle {
	fill: none;
	stroke: steelblue;
	}

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

	d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us.json", function(error, us) {
	if (error) throw error;

	svg.selectAll("circle")
	.data(topojson.feature(us, us.objects.counties).features)
	.enter().append("circle")
	.attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
	.attr("r", function(d) { return Math.sqrt(path.area(d) / Math.PI); });
	});

	</script>