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.
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Hexagonal Binning (Area)
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| license: gpl-3.0 | |
| redirect: https://beta.observablehq.com/@mbostock/d3-hexbin-area |
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| <!DOCTYPE html> | |
| <style> | |
| .hexagon { | |
| fill: steelblue; | |
| stroke: #fff; | |
| stroke-width: 0.5px; | |
| } | |
| </style> | |
| <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: 20, right: 20, bottom: 30, 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(2000).map(function() { return [randomX(), randomY()]; }); | |
| var radius = d3.scaleSqrt() | |
| .domain([0, 50]) | |
| .range([0, 20]); | |
| var hexbin = d3.hexbin() | |
| .radius(20) | |
| .extent([[0, 0], [width, height]]); | |
| var x = d3.scaleLinear() | |
| .domain([0, width]) | |
| .range([0, width]); | |
| var y = d3.scaleLinear() | |
| .domain([0, height]) | |
| .range([height, 0]); | |
| g.append("clipPath") | |
| .attr("id", "clip") | |
| .append("rect") | |
| .attr("width", width) | |
| .attr("height", height); | |
| g.append("g") | |
| .attr("class", "hexagon") | |
| .attr("clip-path", "url(#clip)") | |
| .selectAll("path") | |
| .data(hexbin(points)) | |
| .enter().append("path") | |
| .attr("d", function(d) { return hexbin.hexagon(radius(d.length)); }) | |
| .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }); | |
| g.append("g") | |
| .attr("class", "axis axis--y") | |
| .call(d3.axisLeft(y).tickSizeOuter(-width)); | |
| g.append("g") | |
| .attr("class", "axis axis--x") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(d3.axisBottom(x).tickSizeOuter(-height)); | |
| </script> |
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