Interrupted Sinusoidal Projection

The Sinusoidal Projection is available as d3.geo.sinusoidal in the geo.projection D3 plugin. This demonstrates how it can be used to generate an interrupted projection.

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

body {
  height: 500px;
  position: relative;
  width: 960px;
  font-family: sans-serif;
}

#gores-slider {
  position: absolute;
  left: 10px;
  top: 10px;
}

.background {
  fill: #a4bac7;
}

.foreground {
  fill: none;
  stroke: #333;
  stroke-width: 1.5px;
}

.graticule {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}

.graticule:nth-child(2n) {
  stroke-dasharray: 2,2;
}

.land {
  fill: #d7c7ad;
  stroke: #766951;
}

.boundary {
  fill: none;
  stroke: #a5967e;
}

</style>
<body>
<label for="gores" id="gores-slider"><input type="range" id="gores" step="1" min="1" max="24" value="3"> Gores = <output id="gores-output">3</output></label>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/d3/d3-plugins/geo/projection/projection.js"></script>
<script>

var π = Math.PI;

var width = 960,
    height = 500;

var projection = d3.geo.sinusoidal()
    .scale(130)
    .translate([width / 2 - .5, height / 2 - .5]);

var path = d3.geo.path();

var graticule = d3.geo.graticule();

var interrupt, x, y;

function lobes(n) {
  var dλ = (180 - -180) / n;
  return {
    type: "Polygon",
    coordinates: [hemilobes(n, -180, 180, 0, 90).concat(hemilobes(n, 180, -180, 0, -90))].map(resample),
    properties: {interruptions: d3.range(-180, 180 + dλ / 2, dλ)}
  };
}

function hemilobes(n, λ0, λ1, φ0, φ1) {
  var d = [],
      dλ = (λ1 - λ0) / n,
      δ = dλ / 1e6;
  λ0 += δ;
  for (var i = 0; i < n; i++) {
    d.push([λ0, φ0], [λ0, φ1], [λ0 += dλ - 2 * δ, φ1], [λ0, φ0]);
    λ0 += 2 * δ;
  }
  return d;
}

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

var clipPath = svg.append("defs").append("clipPath")
    .attr("id", "clip").append("path");

var background = svg.append("path")
    .attr("class", "background");

var graticules = svg.selectAll(".graticule")
    .data(graticule.lines)
  .enter().append("path")
    .attr("class", "graticule");

var foreground = svg.append("path")
    .attr("class", "foreground");

d3.select("#gores").on("change", gores);

gores();

clipPath.datum(interrupt);
  background.datum(interrupt);
  foreground.datum(interrupt);
  svg.selectAll("path").attr("d", path);
}

d3.json("/mbostock/3682676/example/readme-boundaries.json", function(err, collection) {
  svg.insert("g", ".graticule")
      .attr("class", "boundary")
      .attr("clip-path", "url(#clip)")
    .selectAll("path")
      .data(collection.geometries)
    .enter().append("path")
      .attr("d", path);
});

d3.json("/mbostock/3682676/example/readme-land.json", function(err, collection) {
  svg.insert("g", ".graticule,.boundary")
      .attr("class", "land")
      .attr("clip-path", "url(#clip)")
    .selectAll("path")
      .data(collection.geometries)
    .enter().append("path")
      .attr("d", path);
});

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

Updated missing url https://raw.github.com/d3/d3-plugins/master/geo/projection/projection.js to https://cdn.jsdelivr.net/gh/d3/d3-plugins/geo/projection/projection.js

Changed ajax call from /d/3682676/readme-boundaries.json to /mbostock/3682676/example/readme-boundaries.json.

Changed ajax call from /d/3682676/readme-land.json to /mbostock/3682676/example/readme-land.json.

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

https://raw.github.com/d3/d3-plugins/master/geo/projection/projection.js