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Last active March 9, 2019 16:58
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Hexagonal Binning
license: gpl-3.0
redirect: https://observablehq.com/@d3/hexbin

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.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>
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