Stretched Projection

Using d3.geo.projection to create a custom stretched projection to fill a viewport. In this case, the equirectangular projection is stretched to fit a 960×500 viewport.

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

.land {
  fill: #ccc;
}

.country-border {
  fill: none;
  stroke: #fff;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var path = d3.geo.path()
    .projection(cylindrical(width, height));

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

d3.json("/../../data/world-50m.json", function(error, world) {
  if (error) throw error;

svg.append("path")
      .datum(topojson.feature(world, world.objects.land))
      .attr("class", "land")
      .attr("d", path);

svg.append("path")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
      .attr("class", "country-border")
      .attr("d", path);
});

function cylindrical(width, height) {
  return d3.geo.projection(function(λ, φ) { return [λ, φ * 2 / width * height]; })
      .scale(width / 2 / Math.PI)
      .translate([width / 2, height / 2]);
}

</script>

Changed /mbostock/raw/4090846/world-50m.json to a local referenece

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

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