Scripts/OtherJs/eCharts/echarts-2.2.1/src/layout/forceLayoutWorker.js

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// 1. Graph Drawing by Force-directed Placement
// 2. http://webatlas.fr/tempshare/ForceAtlas2_Paper.pdf
define(function __echartsForceLayoutWorker(require) {

    'use strict';

    var vec2;
    // In web worker
    var inWorker = typeof(window) === 'undefined' && typeof(require) === 'undefined';
    if (inWorker) {
        vec2 = {
            create: function(x, y) {
                var out = new Float32Array(2);
                out[0] = x || 0;
                out[1] = y || 0;
                return out;
            },
            dist: function(a, b) {
                var x = b[0] - a[0];
                var y = b[1] - a[1];
                return Math.sqrt(x*x + y*y);
            },
            len: function(a) {
                var x = a[0];
                var y = a[1];
                return Math.sqrt(x*x + y*y);
            },
            scaleAndAdd: function(out, a, b, scale) {
                out[0] = a[0] + b[0] * scale;
                out[1] = a[1] + b[1] * scale;
                return out;
            },
            scale: function(out, a, b) {
                out[0] = a[0] * b;
                out[1] = a[1] * b;
                return out;
            },
            add: function(out, a, b) {
                out[0] = a[0] + b[0];
                out[1] = a[1] + b[1];
                return out;
            },
            sub: function(out, a, b) {
                out[0] = a[0] - b[0];
                out[1] = a[1] - b[1];
                return out;
            },
            dot: function (v1, v2) {
                return v1[0] * v2[0] + v1[1] * v2[1];
            },
            normalize: function(out, a) {
                var x = a[0];
                var y = a[1];
                var len = x*x + y*y;
                if (len > 0) {
                    //TODO: evaluate use of glm_invsqrt here?
                    len = 1 / Math.sqrt(len);
                    out[0] = a[0] * len;
                    out[1] = a[1] * len;
                }