dnseminara/index.html

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

.states {
  fill: #99CCFF;
  stroke: #fff;
}

.symbol {
  fill: #FFCC33;
  fill-opacity: .7;
  stroke: #666666;
}

.symbol:hover {
  fill: #CC9900;
  fill-opacity: .9;
  stroke: #000000;
}

.d3-tip {
  line-height: 1;
  font-weight: bold;
  padding: 6px;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  border-radius: 2px;
  max-width: 250px;
  text-align: center;
}

.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: rgba(0, 0, 0, 0.8);
  content: "\25BC";
  position: absolute;
  text-align: center;
}

.d3-tip.n:after {
  margin: -1px 0 0 0;
  top: 100%;
  left: 0;
}


</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v1.min.js"></script>
<script src="http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
<script src="http://d3js.org/queue.v1.min.js"></script>
<script>

var width = 960,
    height = 600;

var radius = d3.scale.sqrt()
    .domain([0, 750])
    .range([0, 12]);

var tip = d3.tip().attr('class', 'd3-tip').html(function(d) { return d.properties.NAMELSAD.replace(" Metro Area", "") + ": " + (d.properties.metro)/100 + "%"; });

var path = d3.geo.path();

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

queue()
    .defer(d3.json, "us.json")
    .defer(d3.json, "msa.json")
    .await(ready);

function ready(error, us, msa) {
  svg.append("path")
      .attr("class", "states")
      .datum(topojson.feature(us, us.objects.us_states))
      .attr("d", path);

  svg.call(tip)

  svg.selectAll(".symbol")
      .data(msa.features.sort(function(a, b) { return b.properties.metro - a.properties.metro; }))
    .enter().append("path")
      .attr("class", "symbol")
      .attr("d", path.pointRadius(function(d) { return radius(d.properties.metro); }))
      .on("mouseover", tip.show)
      .on("mouseout", tip.hide)
}

</script>

## msa.json

      
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              msa.json
            
          
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## us.json

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

	.states {
	fill: #99CCFF;
	stroke: #fff;
	}

	.symbol {
	fill: #FFCC33;
	fill-opacity: .7;
	stroke: #666666;
	}

	.symbol:hover {
	fill: #CC9900;
	fill-opacity: .9;
	stroke: #000000;
	}

	.d3-tip {
	line-height: 1;
	font-weight: bold;
	padding: 6px;
	background: rgba(0, 0, 0, 0.8);
	color: #fff;
	border-radius: 2px;
	max-width: 250px;
	text-align: center;
	}

	.d3-tip:after {
	box-sizing: border-box;
	display: inline;
	font-size: 10px;
	width: 100%;
	line-height: 1;
	color: rgba(0, 0, 0, 0.8);
	content: "\25BC";
	position: absolute;
	text-align: center;
	}

	.d3-tip.n:after {
	margin: -1px 0 0 0;
	top: 100%;
	left: 0;
	}



	</style>
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script src="http://d3js.org/topojson.v1.min.js"></script>
	<script src="http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
	<script src="http://d3js.org/queue.v1.min.js"></script>
	<script>

	var width = 960,
	height = 600;

	var radius = d3.scale.sqrt()
	.domain([0, 750])
	.range([0, 12]);

	var tip = d3.tip().attr('class', 'd3-tip').html(function(d) { return d.properties.NAMELSAD.replace(" Metro Area", "") + ": " + (d.properties.metro)/100 + "%"; });

	var path = d3.geo.path();

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

	queue()
	.defer(d3.json, "us.json")
	.defer(d3.json, "msa.json")
	.await(ready);

	function ready(error, us, msa) {
	svg.append("path")
	.attr("class", "states")
	.datum(topojson.feature(us, us.objects.us_states))
	.attr("d", path);

	svg.call(tip)

	svg.selectAll(".symbol")
	.data(msa.features.sort(function(a, b) { return b.properties.metro - a.properties.metro; }))
	.enter().append("path")
	.attr("class", "symbol")
	.attr("d", path.pointRadius(function(d) { return radius(d.properties.metro); }))
	.on("mouseover", tip.show)
	.on("mouseout", tip.hide)
	}

	</script>