veltman/index.html

## index.html
<!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 http://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>

## preview.png

      
    Raw
  

              preview.png
            
          
## stateplane.topo.json

      
Display the source blob

    
Display the rendered blob

    
    Raw
  

              stateplane.topo.json
            
          
      Sorry, something went wrong. Reload?
      Sorry, we cannot display this file.
      Sorry, this file is invalid so it cannot be displayed.
      
          Viewer requires iframe.
      
    
## thumbnail.png

      
    Raw
  

              thumbnail.png
	<!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 http://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>