Rotating Winkel Tripel by mbostock

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/d3.geo.projection.v0.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var velocity = .02;

var projection = d3.geo.winkel3()
    .translate([width / 2, height / 2]);

var graticule = d3.geo.graticule();

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

var context = canvas.node().getContext("2d");

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

d3.json("/mbostock/raw/4090846/world-110m.json", function(error, world) {
  if (error) throw error;

  var land = topojson.feature(world, world.objects.land);
  d3.timer(function(elapsed) {
    context.clearRect(0, 0, width, height);
    projection.rotate([velocity * elapsed, 0]);

    context.beginPath();
    path(land);
    context.fill();

    context.beginPath();
    path(graticule());
    context.lineWidth = .5;
    context.stroke();

    context.beginPath();
    path(graticule.outline());
    context.lineWidth = 1.5;
    context.stroke();
  });
});

</script>