D3 Examples - [SO 37060362] AlbersUSA + PR / Composed projections

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
rect {
  fill: none;
  pointer-events: all;
}
​
.sphere {
  fill: none;
  stroke: #ccc;
  shape-rendering: crispEdges;
}
 
.graticule {
  fill: none;
  stroke: #777;
  stroke-opacity: .2;
}
​
.mesh {
  fill: none;
  stroke: #000;
}
​
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script src="albers-usa-pr.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var albersUsaPrProj = albersUsaPr()
    .scale(1070)
    .translate([width / 2, height / 2]);
​
var yScale = d3.scale.linear()
               .domain([0,height])
               .range([0.25,1]);
  
var desktopProj = d3.geo.transform({
  point: function(x,y) {
    this.stream.point((x - 0.5*width) * yScale(y) + (0.5*width), y);
  }
});
  
var combinedProj = {
  stream: function(s) {
      return albersUsaPrProj.stream(desktopProj.stream(s));
  }
};
​
var path = d3.geo.path()
    .projection(combinedProj);
  
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var graticule = d3.geo.graticule()
    .step([2, 2]);
​
svg.append("rect")
    .attr("width", width)
    .attr("height", height);
​
svg.append("path")
    .datum({type: "Sphere"})
    .attr("class", "sphere")
    .attr("d", path);
​
svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);
​
svg.on("mousemove", function() {
  console.log(projection.invert(d3.mouse(this)));
});
​
d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us.json", function(error, us) {
  if (error) throw error;
​
  svg.append("path")
      .datum(topojson.mesh(us))
      .attr("class", "mesh")
      .attr("d", path);
});
​
</script>
​
    