Hammer SVG projection [UNLISTED]

In “Selecting a Map Projection” (Sep. 2012), the National Geographic presented an ocean-centric aspect of an interrupted Mollweide projection.

See also Interrupted Homolosine Oceans.

forked from Fil's block: Interrupted Mollweide Oceans

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

.stroke {
  fill: none;
  stroke: #000;
  stroke-width: 3px;
}

.fill {
  fill: #b7ccbb;
}

.graticule {
  fill: none;
  stroke: #777;
  stroke-width: 0.5px;
  stroke-opacity: 0.5;
}

.land {
  fill: #fff;
}

.boundary {
  fill: none;
  stroke: #fff;
  stroke-width: 0.5px;
}

</style>
<svg width="960" height="484"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-geo-projection.v2.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script>

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

var lobes = [
  [
    [[-180,   0], [-130,  90], [ -90,   0]],
    [[ -90,   0], [  -30,  90], [ 60,   0]],
    [[ 60,   0], [  120,  90], [ 180,   0]],
  ],
  [
    [[-180,   0], [-120, -90], [-60,   0]],
    [[ -60,   0], [  20, -90], [  100,   0]],
    [[  100,   0], [ 140, -90], [ 180,   0]]
  ]
];
var projection = d3.geoHammer()
//Interrupt(d3.geoMollweideRaw, lobes)
//    .rotate([-200, 0])
    .fitExtent([[10,10], [width-30, height-10]], {type: "Sphere"});

var graticule = d3.geoGraticule();

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

var defs = svg.append("defs");

defs.append("path")
    .datum({type: "Sphere"})
    .attr("id", "sphere")
    .attr("d", path);

defs.append("clipPath")
    .attr("id", "clip")
  .append("use")
    .attr("xlink:href", "#sphere");

svg.append("use")
    .attr("class", "stroke")
    .attr("xlink:href", "#sphere");

svg.append("use")
    .attr("class", "fill")
    .attr("xlink:href", "#sphere");

if (0) svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("clip-path", "url(#clip)")
    .attr("d", path);

var marker = svg.append("path")
  .attr("fill", "red")

svg.on('mousemove', function() {
  var mouse = d3.mouse(this);
  marker.attr("d", path({type:"Point", coordinates: projection.invert(mouse)}));
});

d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/world-50m.json", function(error, world) {
  if (error) throw error;

svg.insert("path", ".graticule")
      .datum(topojson.feature(world, world.objects.land))
      .attr("class", "land")
      .attr("clip-path", "url(#clip)")
      .attr("d", path);

svg.insert("path", ".graticule")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
      .attr("class", "boundary")
      .attr("clip-path", "url(#clip)")
      .attr("d", path);
});

</script>

https://d3js.org/d3.v4.min.js

https://d3js.org/d3-geo-projection.v2.min.js

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