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; color encodes the number of points that fall into each bin. You can also use area encoding. Inspired by earlier work by Zachary Johnson.
Last active
January 31, 2024 11:52
-
-
Save mbostock/4248145 to your computer and use it in GitHub Desktop.
Hexagonal Binning (Color)
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/d3-hexbin |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <style> | |
| .hexagon { | |
| stroke: #000; | |
| 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 color = d3.scaleSequential(d3.interpolateLab("white", "steelblue")) | |
| .domain([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", hexbin.hexagon()) | |
| .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }) | |
| .attr("fill", function(d) { return color(d.length); }); | |
| 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> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment