Computing hexbins from a fluctuating sample of 2,000 random points.
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March 23, 2018 08:45
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Dynamic Hexbin
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| license: gpl-3.0 |
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.
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| <!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"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var delta = 0.001, | |
| i = 0, j, | |
| n = 2000, // Total number of random points. | |
| k = 20; // Number of points to replace per frame. | |
| var rx = d3.randomNormal(width / 2, 80), | |
| ry = d3.randomNormal(height / 2, 80), | |
| points = d3.range(n).map(function() { return [rx(), ry()]; }); | |
| var color = d3.scaleSequential(d3.interpolateLab("white", "steelblue")) | |
| .domain([0, 20]); | |
| var hexbin = d3.hexbin() | |
| .radius(20) | |
| .extent([[0, 0], [width, height]]); | |
| var hexagon = svg.selectAll("path") | |
| .data(hexbin(points)) | |
| .enter().append("path") | |
| .attr("d", hexbin.hexagon(19.5)) | |
| .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }) | |
| .attr("fill", function(d) { return color(d.length); }); | |
| d3.timer(function(elapsed) { | |
| rx = d3.randomNormal(width / 2 + 80 * Math.cos(elapsed * delta), 80), | |
| ry = d3.randomNormal(height / 2 + 80 * Math.sin(elapsed * delta), 80); | |
| for (j = 0; j < k; ++j, i = (i + 1) % n) points[i][0] = rx(), points[i][1] = ry(); | |
| hexagon = hexagon | |
| .data(hexbin(points), function(d) { return d.x + "," + d.y; }); | |
| hexagon.exit().remove(); | |
| hexagon = hexagon.enter().append("path") | |
| .attr("d", hexbin.hexagon(19.5)) | |
| .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }) | |
| .merge(hexagon) | |
| .attr("fill", function(d) { return color(d.length); }); | |
| }); | |
| </script> |
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