113th U.S. Congressional Districts

In response to a Stack Overflow question regarding TopoJSON for congressional districts.

forked from mbostock's block: 113th U.S. Congressional Districts

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

path {
  stroke-linejoin: round;
  stroke-linecap: round;
}

.districts {
  fill: #bbb;
}

.districts :hover {
  fill: orange;
}

.district-boundaries {
  pointer-events: none;
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}

.state-boundaries {
  pointer-events: none;
  fill: none;
  stroke: #fff;
  stroke-width: 1.5px;
}

</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 = 600;

var projection = d3.geo.albersUsa()
    .scale(1280)
    .translate([width / 2, height / 2]);

var path = d3.geo.path()
    .projection(projection);

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

queue()
    .defer(d3.json, "https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us.json")
    .defer(d3.json, "https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us-congress-113.json")
    .await(ready);

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

svg.append("defs").append("path")
      .attr("id", "land")
      .datum(topojson.feature(us, us.objects.land))
      .attr("d", path);

svg.append("clipPath")
      .attr("id", "clip-land")
    .append("use")
      .attr("xlink:href", "#land");

svg.append("g")
      .attr("class", "districts")
      .attr("clip-path", "url(#clip-land)")
    .selectAll("path")
      .data(topojson.feature(congress, congress.objects.districts).features)
    .enter().append("path")
      .attr("d", path)
    .append("title")
      .text(function(d) { return d.id; });

svg.append("path")
      .attr("class", "district-boundaries")
      .datum(topojson.mesh(congress, congress.objects.districts, function(a, b) { return a !== b && (a.id / 1000 | 0) === (b.id / 1000 | 0); }))
      .attr("d", path);

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

d3.select(self.frameElement).style("height", height + "px");

</script>

https://d3js.org/d3.v3.min.js

https://d3js.org/queue.v1.min.js

https://d3js.org/topojson.v1.min.js