Flipping and Spinning the Unites States

Having some fun with the flipping states idea from this map by @LaurenLeatherby & @Rich_Harris.

<!DOCTYPE html>
<meta charset="utf-8">
<head>
	<style>
		polygon {
			fill: darkgreen;
			fill-opacity: .7;
			stroke: #000;
		}
		.flipped {
			fill: steelblue;
		}
		button {
			position: absolute;
			top:325px;
			left:775px;
			border: 1px solid black;
			border-radius: 5px;
			font-size: 1em;
			background-color: white;
		}
	</style>
	<script src="//d3js.org/d3.v4.min.js"></script>
	<script src="states_big.js"></script>
</head>
<body>
	<button onclick="spin()">Reset</button>
</body>
<script>

var width = 960,
      height = 450;

var projection = d3.geoAlbersUsa()
		.translate([width/2, height/2])
		.scale([900]);

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

stateData.forEach(function(d) {
		if (d.geometry.type == "MultiPolygon") {  
			var joinedCoords = []
			for (i in d.geometry.coordinates) {joinedCoords.push(...d.geometry.coordinates[i])}
			d.center = projection(d3.polygonCentroid(joinedCoords))
			d.centered = []
			for (i in d.geometry.coordinates) {
				d.centered[i] = []
				d.geometry.coordinates[i].forEach(function(p) {
					d.centered[i].push([projection(p)[0] - d.center[0], projection(p)[1] - d.center[1]])
				})
			}
		} else {
			d.center = projection(d3.polygonCentroid(d.geometry.coordinates[0]))
			d.centered = []
			d.geometry.coordinates[0].forEach(function(p) {
				d.centered.push([projection(p)[0] - d.center[0], projection(p)[1] - d.center[1]])
			})
		}
	})

var states = svg.selectAll("g")
		.data(stateData)
	 .enter().append("g")
		.attr("id", function(d) {return d.name})
		.on("mouseover", flipOne)
		
	states.each(function(p) {
		if (p.geometry.type == "MultiPolygon") {  
			d3.select(this).selectAll("polygon")
				.data(p.centered)
			 .enter().append("polygon")
				.datum(function(d, i) {return {centered: p.centered[i], center: p.center}})
				.attr("points", function(d) {return d.centered})
				.attr("transform", function(d) {return "translate(" + d.center + ")"})
		} else {                
			d3.select(this).append("polygon")
				.datum({centered: p.centered, center: p.center})
				.attr("points", p.centered)
				.attr("transform", "translate(" + p.center + ")")
		}
	})

function spin() {
		states.each(function(p) {
			var thisState = this;
			d3.select(thisState).on("mouseover", null)
				.selectAll("polygon")
				.transition().duration(450).ease(d3.easeQuadIn)
					.attr("transform", function(d) {return "translate(" + d.center + ")rotate(120)scale(.5)"})
				.transition().duration(100).ease(d3.easeLinear)
					.attr("transform", function(d) {return "translate(" + d.center + ")rotate(240)scale(.5)"})
				.transition().duration(100).ease(d3.easeLinear)
					.attr("transform", function(d) {return "translate(" + d.center + ")rotate(360)scale(.5)"})
				.transition().duration(100).ease(d3.easeLinear)
					.attr("transform", function(d) {return "translate(" + d.center + ")rotate(120)scale(.5)"})
				.transition().duration(100).ease(d3.easeLinear)
					.attr("transform", function(d) {return "translate(" + d.center + ")rotate(240)scale(.5)"})
				.transition().duration(450).ease(d3.easeQuadOut)
					.attr("transform", function(d) {return "translate(" + d.center + ")rotate(360)scale(1)"})
					.attr("class",null)
					.on("end", function() {d3.select(thisState).on("mouseover", flipOne)})
		})
	}    
</script>

https://d3js.org/d3.v4.min.js