Computing hexbins from a constantly-fluctuating sample of 2,000 random points.
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .hexagon { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: .5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/d3.hexbin.v0.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500, | |
| i = -1, | |
| θ = 0, | |
| δθ = .03, | |
| n = 2000, | |
| k = 20; // samples to replace per frame | |
| var randomX = d3.random.normal(width / 2, 80), | |
| randomY = d3.random.normal(height / 2, 80), | |
| points = d3.range(n).map(function() { return [randomX(), randomY()]; }); | |
| var color = d3.scale.linear() | |
| .domain([0, 20]) | |
| .range(["white", "steelblue"]) | |
| .interpolate(d3.interpolateLab); | |
| var hexbin = d3.hexbin() | |
| .size([width, height]) | |
| .radius(20); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var hexagon = svg.append("g") | |
| .attr("class", "hexagons") | |
| .selectAll("path") | |
| .data(hexbin(points)) | |
| .enter().append("path") | |
| .attr("d", hexbin.hexagon(19.5)) | |
| .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }) | |
| .style("fill", function(d) { return color(d.length); }); | |
| d3.timer(function() { | |
| θ += δθ; | |
| randomX = d3.random.normal(width / 2 + 80 * Math.cos(θ), 80), | |
| randomY = d3.random.normal(height / 2 + 80 * Math.sin(θ), 80); | |
| for (var j = 0; j < k; ++j) { | |
| i = (i + 1) % n; | |
| points[i][0] = randomX(); | |
| points[i][1] = randomY(); | |
| } | |
| hexagon = hexagon | |
| .data(hexbin(points), function(d) { return d.i + "," + d.j; }); | |
| hexagon.exit().remove(); | |
| hexagon.enter().append("path") | |
| .attr("d", hexbin.hexagon(19.5)) | |
| .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }); | |
| hexagon | |
| .style("fill", function(d) { return color(d.length); }); | |
| }); | |
| </script> |
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