Hexagonal Binning (Area) d3v4

This example shows how to use the d3.hexbin plugin for hexagonal binning. 2,000 random points with a normal distribution are binned into hexagons; area encodes the number of points that fall into each bin. You can also use color encoding. Inspired by earlier work by Zachary Forest Johnson.

forked from mbostock's block: Hexagonal Binning (Area)

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.axis text {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.hexagon {
  fill: steelblue;
  stroke: #fff;
  stroke-width: .5px;
}

</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="d3.hexbin.min.js"></script>
<script>

var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var randomX = d3.randomNormal(width / 2, 80),
    randomY = d3.randomNormal(height / 2, 80),
    points = d3.range(2000).map(function() { return [randomX(), randomY()]; });

var radius = d3.scaleSqrt()
    .domain([0, 50])
    .range([0, 20]);

var hexbin = d3.hexbin()
    .size([width, height])
    .radius(20);

var x = d3.scaleIdentity()
    .domain([0, width]);

var y = d3.scaleLinear()
    .domain([0, height])
    .range([height, 0]);

var xAxis = d3.axisBottom()
    .scale(x)
    .tickSize(6, -height);

var yAxis = d3.axisLeft()
    .scale(y)
    .tickSize(6, -width);

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

svg.append("clipPath")
    .attr("id", "clip")
  .append("rect")
    .attr("class", "mesh")
    .attr("width", width)
    .attr("height", height);

svg.append("g")
    .attr("clip-path", "url(#clip)")
  .selectAll(".hexagon")
    .data(hexbin(points))
  .enter().append("path")
    .attr("class", "hexagon")
    .attr("d", function(d) { return hexbin.hexagon(radius(d.length)); })
    .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });

svg.append("g")
    .attr("class", "y axis")
    .call(yAxis);

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

</script>

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