D3 Examples - Geodesic Grid

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
path {
  fill: none;
  stroke: #000;
}
​
circle {
  fill: none;
  stroke: #000;
  stroke-width: 3px;
}
​
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="geodesic.js" charset="utf-8"></script>
<script>
​
var width = 960,
    height = 500;
​
var velocity = [-.003, .003];
​
var projection = d3.geo.orthographic()
    .scale(240);
​
var path = d3.geo.path()
    .projection(projection);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var feature = svg.append("path")
    .datum(d3.geodesic.multilinestring(8));
​
svg.append("circle")
    .attr("r", 240)
    .attr("cx", width / 2)
    .attr("cy", height / 2);
​
d3.timer(function(elapsed) {
  projection.rotate([elapsed * velocity[0], elapsed * velocity[1]]);
  feature.attr("d", path);
});
​
</script>
​
    