Hexagonal Binning

A demonstration of the d3-hexbin plugin for D3 4.0.

<!DOCTYPE html>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-hexbin.v0.2.min.js"></script>
<script>

var svg = d3.select("svg"),
    margin = {top: 40, right: 20, bottom: 20, left: 40},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var randomX = d3.randomNormal(width / 2, 80),
    randomY = d3.randomNormal(height / 2, 80),
    points = d3.range(10000).map(function() { return [randomX(), randomY()]; });

var hexbin = d3.hexbin()
    .extent([[-margin.left, -margin.top], [width + margin.right, height + margin.bottom]])
    .radius(10);

var bins = hexbin(points);

var color = d3.scaleSequential(d3.interpolateMagma)
    .domain([d3.max(bins, function(d) { return d.length; }), 0]);

g.append("g")
    .attr("fill", "none")
    .attr("stroke", "#fff")
    .attr("stroke-opacity", 0.5)
  .selectAll("path")
  .data(bins)
  .enter().append("path")
    .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
    .attr("fill", function(d) { return color(d.length); })
    .attr("d", hexbin.hexagon());

g.append("g")
    .call(d3.axisTop(d3.scaleIdentity().domain([0, width])));

g.append("g")
    .call(d3.axisLeft(d3.scaleIdentity().domain([0, height])));

</script>

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

https://d3js.org/d3-hexbin.v0.2.min.js