Entropy by HarryStevens

index.html

<!DOCTYPE html>
<html>
<head>
	<style>
	body {
		margin: 0 auto;
	}
	</style>
</head>
<body>
<div id="viz"></div>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chroma-js/1.3.3/chroma.min.js"></script>
<script>

var	width = window.innerWidth,
	height = window.innerHeight,
	svg = d3.select("#viz").append("svg")
			.attr("width", width)
			.attr("height", height)
	c = chroma.scale(["white", "steelblue", "white", "black", "white", "tomato", "white"]).mode("hsl"),
	x = d3.scaleLinear()
		.range([0, width]),
	y = d3.scaleLinear()
		.range([height, 0]),
	voronoi = d3.voronoi()
		.x(function(d){ return x(d.x); })
		.y(function(d){ return y(d.y); })
		.extent([[0, 0], [width, height]]);

var data = generate_data();

redraw(data);

d3.interval(function(){
	redraw(update_data(data));
}, 600);


function redraw(data){
	
	x.domain(d3.extent(data, function(d){ return d.x; }));
	y.domain(d3.extent(data, function(d){ return d.y; }));
	c.domain(d3.extent(data, function(d){ return d.x; }));

	var voronoi_path = svg.selectAll(".voronoi")
			.data(voronoi(data).polygons(), function(d){ return d == undefined ? null : d.data.id; });

	voronoi_path
		.transition().delay(function(d, i){ return i / 2; })
			.attr("d", function(d) { return d ? "M" + d.join("L") + "Z" : null; });
		
	voronoi_path.enter().append("path")
			.attr("class", "voronoi")
			.attr("fill", function(d){ return d ? c(d.data.x) : null; })
			.attr("d", function(d) { return d ? "M" + d.join("L") + "Z" : null; });

}

function generate_data(){
	var arr = [];
	for (var i = 0; i<= 250; i++){
		arr.push({
			id: i,
			x: random(0, 1000),
			y: random(0, 1000)
		});
	}
	return arr;
}

function update_data(data){
	return data.map(function(d){
		return {
			id: d.id,
			x: d.x + random(1, 100),
			y: d.y + random(1, 100)
		}
	});
}

// random number function
function random(min, max){
  return Math.floor(Math.random() * (max - min + 1) + min);
}

</script>

</body>
</html>