Antimeridian Cutting II

A demonstration of antimeridian cutting using d3.geoInterruptedHomolosine. Just… because.

<!DOCTYPE html>
<meta charset="utf-8">
<canvas width="960" height="500"></canvas>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-geo-projection.v1.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>
<script>

var canvas = d3.select("canvas"),
    context = canvas.node().getContext("2d"),
    width = canvas.property("width"),
    height = canvas.property("height");

var lambda = d3.scaleLinear()
    .domain([0, width])
    .range([-180, 180]);

var phi = d3.scaleLinear()
    .domain([0, height])
    .range([90, -90]);

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

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

d3.json("https://d3js.org/world-110m.v1.json", function(error, world) {
  if (error) throw error;

var land = topojson.feature(world, world.objects.land),
      sphere = {type: "Sphere"},
      touch = "ontouchstart" in window;

canvas.on(touch ? "touchmove" : "mousemove", move);

draw();

function move() {
    var p = touch ? d3.touches(this)[0] : d3.mouse(this);
    projection.rotate([lambda(p[0]), phi(p[1])]), draw();
    d3.event.preventDefault();
  }

function draw() {
    context.clearRect(0, 0, width, height);
    context.save();
    context.beginPath();
    path(sphere);
    context.fillStyle = "#fff";
    context.fill();
    context.clip();
    context.beginPath();
    path(land);
    context.fillStyle = "#000";
    context.fill();
    context.restore();
    context.beginPath();
    path(sphere);
    context.stroke();
  }
});

</script>

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

https://d3js.org/d3-geo-projection.v1.min.js

https://d3js.org/topojson.v2.min.js