D3 Examples - Hypnostates

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
path {
  stroke-linejoin: round;
  stroke: #444;
  stroke-width: 1px;
  fill: url(#rainbow);
}
​
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.min.js"></script>
<script src="//d3js.org/d3.v4.0.0-alpha.18.min.js"></script>
<script>
  var rainbow = d3.scaleRainbow(); // lazy
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.14/d3.min.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var gradient = svg.append("defs")
  .append("radialGradient")
    .attr("id","rainbow");
​
var modded = function(d){
  return rainbow((4 * d) % 1);
};
​
gradient
    .selectAll("stop")
    .data(d3.range(0,1,0.01))
    .enter()
    .append("stop")
      .attr("offset",function(d){
        return d;
      })
      .attr("stop-color",modded);
​
d3.json("stateplane.topo.json",function(err,stateplane){
​
  var zones = topojson.feature(stateplane,stateplane.objects.stateplane).features;
      outer = topojson.merge(stateplane,stateplane.objects.stateplane.geometries);
​
  zones.forEach(function(zone){
​
    var fn = d3.geo[zone.properties.type]().rotate(zone.properties.rotate);
​
    if (zone.properties.parallels) {
      fn.parallels(zone.properties.parallels);
    }
​
    zone.properties.path = scaledPath(fn);
​
  });
​
  outer.type = "Polygon";
  outer.coordinates = [outer.coordinates[0][0]];
​
  d3.shuffle(zones);
​
  var us = svg.append("path")
    .attr("class","outer")
    .datum(outer)
    .attr("d",zones[0].properties.path)
    .each(morph);
​
  d3.selectAll("stop")
    .each(cycle);
​
  function morph() {
​
    var current = zones[0],
        next = zones.pop();
​
    zones.unshift(next);
​
    d3.select(this).transition()
      .ease("linear")
      .duration(1250)
      .attr("d",next.properties.path)
      .each("end",morph);
​
  }
​
  function scaledPath(projection) {
​
    var p = d3.geo.path().projection(projection);
​
    // Auto-scale a la https://bl.ocks.org/mbostock/4707858
​
    projection
      .scale(1)
      .translate([0, 0]);
​
    var b = p.bounds(outer),
        s = .95 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height),
        t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2];
​
    projection
      .scale(s)
      .translate(t);
​
    return p;
​
  }
​
});
​
function cycle(d) {
​
  d3.select(this).transition()
    .duration(2000)
    .ease("linear")
    .attrTween("stop-color",function(d){
​
      return function(t) {
        return modded((d + t) % 1);
      };
​
    })
    .each("end",cycle);
​
}
​
</script>
​
    