mbostock · March 18, 2020 01:28 · ghost · Sep 8, 2014
diff --git a/.block b/.block
 license: gpl-3.0
 redirect: https://observablehq.com/@d3/threshold-choropleth
diff --git a/README.md b/README.md
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <meta charset="utf-8">
 <style>

 .states {
  fill: none;
  stroke: #fff;
  stroke-linejoin: round;
 }

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

 var width = 960,
    height = 500;

 var color = d3.scale.threshold()
    .domain([0.02, 0.04, 0.06, 0.08, 0.10])
    .range(["#f2f0f7", "#dadaeb", "#bcbddc", "#9e9ac8", "#756bb1", "#54278f"]);

 var path = d3.geo.path();

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

 queue()
    .defer(d3.json, "/mbostock/raw/4090846/us.json")
    .defer(d3.tsv, "unemployment.tsv")
    .await(ready);

 function ready(error, us, unemployment) {
  if (error) throw error;

  var rateById = {};

  unemployment.forEach(function(d) { rateById[d.id] = +d.rate; });

  svg.append("g")
      .attr("class", "counties")
    .selectAll("path")
      .data(topojson.feature(us, us.objects.counties).features)
    .enter().append("path")
      .attr("d", path)
      .style("fill", function(d) { return color(rateById[d.id]); });

  svg.append("path")
      .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a.id !== b.id; }))
      .attr("class", "states")
      .attr("d", path);
 }

 </script>
diff --git a/thumbnail.png b/thumbnail.png
diff --git a/unemployment.tsv b/unemployment.tsv
	license: gpl-3.0
	redirect: https://observablehq.com/@d3/threshold-choropleth
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	.states {
	fill: none;
	stroke: #fff;
	stroke-linejoin: round;
	}

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

	var width = 960,
	height = 500;

	var color = d3.scale.threshold()
	.domain([0.02, 0.04, 0.06, 0.08, 0.10])
	.range(["#f2f0f7", "#dadaeb", "#bcbddc", "#9e9ac8", "#756bb1", "#54278f"]);

	var path = d3.geo.path();

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

	queue()
	.defer(d3.json, "/mbostock/raw/4090846/us.json")
	.defer(d3.tsv, "unemployment.tsv")
	.await(ready);

	function ready(error, us, unemployment) {
	if (error) throw error;

	var rateById = {};

	unemployment.forEach(function(d) { rateById[d.id] = +d.rate; });

	svg.append("g")
	.attr("class", "counties")
	.selectAll("path")
	.data(topojson.feature(us, us.objects.counties).features)
	.enter().append("path")
	.attr("d", path)
	.style("fill", function(d) { return color(rateById[d.id]); });

	svg.append("path")
	.datum(topojson.mesh(us, us.objects.states, function(a, b) { return a.id !== b.id; }))
	.attr("class", "states")
	.attr("d", path);
	}

	</script>