D3 Examples - The State Plane Shuffle

xxxxxxxxxx
 
<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
path {
  stroke-linejoin: round;
  fill: none;
  stroke: #444;
  stroke-width: 1px;
}
​
text {
  font: 32px sans-serif;
  font-weight: bold;
}
​
.highlight {
  fill: #f0f;
  stroke: none;
}
​
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.14/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.20/topojson.min.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
d3.json("stateplane.topo.json",function(err,stateplane){
​
  var inner = topojson.mesh(stateplane,stateplane.objects.stateplane,function(a, b) { return a !== b; }),
      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);
​
  });
​
  d3.shuffle(zones);
​
  svg.append("path")
    .attr("class","outer")
    .datum(outer);
​
  var highlight = svg.append("path")
    .attr("class","highlight")
    .datum(zones[0]);
​
  svg.append("path")
    .attr("class","inner")
    .datum(inner);
​
  var paths = d3.selectAll("path")
    .attr("d",zones[0].properties.path);
​
  var text = svg.append("text")
    .attr("x",0)
    .attr("y",height)
    .attr("dy","-1em")
    .text(zones[0].properties.name);
​
  morph();
​
  function morph() {
​
    var current = zones[0],
        next = zones.pop();
​
    zones.unshift(next);
​
    highlight.datum(next)
      .attr("d",current.properties.path);
​
    text.transition()
      .delay(100)
      .duration(0)
      .each("end",function(){
        text.text(next.properties.name);
      });
​
    paths.transition()
      .delay(100)
      .duration(1200)
      .attr("d",next.properties.path)
      .each("end",function(d,i){
        if (i === 2) {
          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;
​
  }
​
});
​
</script>
​
    