127 lines
3.4 KiB
JavaScript
127 lines
3.4 KiB
JavaScript
// https://github.com/d3/d3-hexbin Version 0.2.2. Copyright 2017 Mike Bostock.
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//license:BSD 3-clause "New" or "Revised"
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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typeof define === 'function' && define.amd ? define(['exports'], factory) :
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(factory((global.d3 = global.d3 || {})));
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}(this, (function (exports) { 'use strict';
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var thirdPi = Math.PI / 3;
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var angles = [0, thirdPi, 2 * thirdPi, 3 * thirdPi, 4 * thirdPi, 5 * thirdPi];
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function pointX(d) {
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return d[0];
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}
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function pointY(d) {
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return d[1];
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}
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var hexbin = function() {
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var x0 = 0,
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y0 = 0,
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x1 = 1,
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y1 = 1,
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x = pointX,
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y = pointY,
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r,
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dx,
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dy;
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function hexbin(points) {
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var binsById = {}, bins = [], i, n = points.length;
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for (i = 0; i < n; ++i) {
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if (isNaN(px = +x.call(null, point = points[i], i, points))
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|| isNaN(py = +y.call(null, point, i, points))) continue;
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var point,
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px,
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py,
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pj = Math.round(py = py / dy),
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pi = Math.round(px = px / dx - (pj & 1) / 2),
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py1 = py - pj;
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if (Math.abs(py1) * 3 > 1) {
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var px1 = px - pi,
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pi2 = pi + (px < pi ? -1 : 1) / 2,
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pj2 = pj + (py < pj ? -1 : 1),
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px2 = px - pi2,
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py2 = py - pj2;
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if (px1 * px1 + py1 * py1 > px2 * px2 + py2 * py2) pi = pi2 + (pj & 1 ? 1 : -1) / 2, pj = pj2;
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}
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var id = pi + "-" + pj, bin = binsById[id];
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if (bin) bin.push(point);
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else {
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bins.push(bin = binsById[id] = [point]);
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bin.x = (pi + (pj & 1) / 2) * dx;
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bin.y = pj * dy;
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}
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}
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return bins;
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}
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function hexagon(radius) {
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var x0 = 0, y0 = 0;
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return angles.map(function(angle) {
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var x1 = Math.sin(angle) * radius,
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y1 = -Math.cos(angle) * radius,
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dx = x1 - x0,
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dy = y1 - y0;
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x0 = x1, y0 = y1;
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return [dx, dy];
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});
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}
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hexbin.hexagon = function(radius) {
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return "m" + hexagon(radius == null ? r : +radius).join("l") + "z";
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};
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hexbin.centers = function() {
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var centers = [],
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j = Math.round(y0 / dy),
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i = Math.round(x0 / dx);
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for (var y = j * dy; y < y1 + r; y += dy, ++j) {
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for (var x = i * dx + (j & 1) * dx / 2; x < x1 + dx / 2; x += dx) {
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centers.push([x, y]);
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}
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}
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return centers;
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};
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hexbin.mesh = function() {
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var fragment = hexagon(r).slice(0, 4).join("l");
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return hexbin.centers().map(function(p) { return "M" + p + "m" + fragment; }).join("");
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};
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hexbin.x = function(_) {
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return arguments.length ? (x = _, hexbin) : x;
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};
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hexbin.y = function(_) {
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return arguments.length ? (y = _, hexbin) : y;
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};
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hexbin.radius = function(_) {
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return arguments.length ? (r = +_, dx = r * 2 * Math.sin(thirdPi), dy = r * 1.5, hexbin) : r;
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};
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hexbin.size = function(_) {
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return arguments.length ? (x0 = y0 = 0, x1 = +_[0], y1 = +_[1], hexbin) : [x1 - x0, y1 - y0];
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};
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hexbin.extent = function(_) {
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return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], hexbin) : [[x0, y0], [x1, y1]];
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};
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return hexbin.radius(1);
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};
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exports.hexbin = hexbin;
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Object.defineProperty(exports, '__esModule', { value: true });
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})));
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