D3 Examples - World Boundaries TopoJSON

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
path {
  fill: none;
  stroke: #000;
}
​
.graticule {
  fill: none;
  stroke: #ccc;
  stroke-width: .5px;
}
​
.foreground {
  fill: none;
  stroke: #333;
  stroke-width: 1.5px;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="topojson.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var projection = d3.geo.orthographic()
    .scale(250)
    .clipAngle(90);
​
var path = d3.geo.path()
    .projection(projection);
​
var graticule = d3.geo.graticule();
​
var λ = d3.scale.linear()
    .domain([0, width])
    .range([-180, 180]);
​
var φ = d3.scale.linear()
    .domain([0, height])
    .range([90, -90]);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
svg.on("mousemove", function() {
  var p = d3.mouse(this);
  projection.rotate([λ(p[0]), φ(p[1])]);
  svg.selectAll("path:not(.foreground)").attr("d", path);
});
​
svg.append("path")
    .attr("class", "graticule")
    .datum(graticule)
    .attr("d", path);
​
svg.append("path")
    .datum(graticule.outline)
    .attr("class", "foreground")
    .attr("d", path);
​
d3.json("readme-world-admin1.json", function(error, topology) {
  svg.append("path")
      .datum(topojson.mesh(topology))
      .attr("d", path);
});
​
</script>
​
    