A demonstration of the d3-hexbin plugin for D3 4.0.
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Hexbins
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| license: gpl-3.0 | |
| border: no |
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| (function (global, factory) { | |
| typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) : | |
| typeof define === 'function' && define.amd ? define(['exports'], factory) : | |
| (factory((global.d3 = global.d3 || {}))); | |
| }(this, function (exports) { 'use strict'; | |
| var version = "0.2.1"; | |
| var thirdPi = Math.PI / 3; | |
| var angles = [0, thirdPi, 2 * thirdPi, 3 * thirdPi, 4 * thirdPi, 5 * thirdPi]; | |
| function pointX(d) { | |
| return d[0]; | |
| } | |
| function pointY(d) { | |
| return d[1]; | |
| } | |
| function hexbin() { | |
| var x0 = 0, | |
| y0 = 0, | |
| x1 = 1, | |
| y1 = 1, | |
| x = pointX, | |
| y = pointY, | |
| r, | |
| dx, | |
| dy; | |
| function hexbin(points) { | |
| var binsById = {}, bins = [], i, n = points.length; | |
| for (i = 0; i < n; ++i) { | |
| if (isNaN(px = +x.call(null, point = points[i], i, points)) | |
| || isNaN(py = +y.call(null, point, i, points))) continue; | |
| var point, | |
| px, | |
| py, | |
| pj = Math.round(py = py / dy), | |
| pi = Math.round(px = px / dx - (pj & 1) / 2), | |
| py1 = py - pj; | |
| if (Math.abs(py1) * 3 > 1) { | |
| var px1 = px - pi, | |
| pi2 = pi + (px < pi ? -1 : 1) / 2, | |
| pj2 = pj + (py < pj ? -1 : 1), | |
| px2 = px - pi2, | |
| py2 = py - pj2; | |
| if (px1 * px1 + py1 * py1 > px2 * px2 + py2 * py2) pi = pi2 + (pj & 1 ? 1 : -1) / 2, pj = pj2; | |
| } | |
| var id = pi + "-" + pj, bin = binsById[id]; | |
| if (bin) bin.push(point); | |
| else { | |
| bins.push(bin = binsById[id] = [point]); | |
| bin.x = (pi + (pj & 1) / 2) * dx; | |
| bin.y = pj * dy; | |
| } | |
| } | |
| return bins; | |
| } | |
| function hexagon(radius) { | |
| var x0 = 0, y0 = 0; | |
| return angles.map(function(angle) { | |
| var x1 = Math.sin(angle) * radius, | |
| y1 = -Math.cos(angle) * radius, | |
| dx = x1 - x0, | |
| dy = y1 - y0; | |
| x0 = x1, y0 = y1; | |
| return [dx, dy]; | |
| }); | |
| } | |
| hexbin.hexagon = function(radius) { | |
| return "m" + hexagon(radius == null ? r : +radius).join("l") + "z"; | |
| }; | |
| hexbin.centers = function() { | |
| var centers = [], | |
| j = Math.round(y0 / dy), | |
| i = Math.round(x0 / dx); | |
| for (var y = j * dy; y < y1 + r; y += dy, ++j) { | |
| for (var x = i * dx + (j & 1) * dx / 2; x < x1 + dx / 2; x += dx) { | |
| centers.push([x, y]); | |
| } | |
| } | |
| return centers; | |
| }; | |
| hexbin.mesh = function() { | |
| var fragment = hexagon(r).slice(0, 4).join("l"); | |
| return hexbin.centers().map(function(p) { return "M" + p + "m" + fragment; }).join(""); | |
| }; | |
| hexbin.x = function(_) { | |
| return arguments.length ? (x = _, hexbin) : x; | |
| }; | |
| hexbin.y = function(_) { | |
| return arguments.length ? (y = _, hexbin) : y; | |
| }; | |
| hexbin.radius = function(_) { | |
| return arguments.length ? (r = +_, dx = r * 2 * Math.sin(thirdPi), dy = r * 1.5, hexbin) : r; | |
| }; | |
| hexbin.extent = function(_) { | |
| return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], hexbin) : [[x0, y0], [x1, y1]]; | |
| }; | |
| return hexbin.radius(1); | |
| } | |
| exports.version = version; | |
| exports.hexbin = hexbin; | |
| Object.defineProperty(exports, '__esModule', { value: true }); | |
| })); |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| html, body { | |
| background: #111; | |
| } | |
| .hexagons { | |
| fill: none; | |
| stroke: #000; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v4.js"></script> | |
| <script src="d3-hexbin.js"></script> | |
| <script> | |
| var margin = {top: 12, right: 12, bottom: 12, left: 12}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var randomX = d3.randomBates(2), | |
| randomY = d3.randomBates(2), | |
| points = d3.range(2000).map(function() { return [width * randomX(), height * randomY()]; }); | |
| var hexbin = d3.hexbin() | |
| .extent([[-margin.left, -margin.top], [width + margin.right, height + margin.bottom]]) | |
| .radius(10); | |
| var bins = hexbin(points); | |
| var color = d3.scaleSequential(d3.interpolatePlasma) | |
| .domain([0, 10]); | |
| 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("g") | |
| .attr("class", "hexagons") | |
| .selectAll("path") | |
| .data(bins) | |
| .enter().append("path") | |
| .attr("d", hexbin.hexagon()) | |
| .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }) | |
| .style("fill", function(d) { return color(d.length); }); | |
| /* Messing with bl.ocks.org styles */ | |
| if(window.parent && window.parent.document) { | |
| window.parent.document.body.style.backgroundColor = "#111" | |
| window.parent.document.body.style.color = "#fff" | |
| d3.selectAll(window.parent.document.getElementsByTagName("a")).style("color", "rgb(244, 136, 73)"); | |
| } | |
| </script> |
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