38 lines
1.0 KiB
JavaScript
38 lines
1.0 KiB
JavaScript
/*jslint plusplus: true */
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/*globals self, importScripts, utils */
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(function () {
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'use strict';
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importScripts('utils.js');
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function getRandomPoint(w, h) {
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return [utils.getRandomArbitary(0, 1) * w, utils.getRandomArbitary(0, 1) * h];
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}
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self.addEventListener('message', function (e) {
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var points = [], vertices = e.data[2], size = e.data[1], point, pointSkip = 100,
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i = parseInt(e.data[0], 10) + pointSkip, j, length = vertices.length,
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frac = e.data[3], cvert, numvertex, correction;
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correction = 1 / frac - 1; // make points fit in the container
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point = getRandomPoint(size[0], size[1]);
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do {
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numvertex = utils.getRandomInt(0, vertices.length - 1);
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cvert = vertices[numvertex];
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point = [(cvert[0] + point[0]) * (frac), (cvert[1] + point[1]) * (frac)];
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if (i > pointSkip) { // skip the first few points
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points.push([
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[
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point[0] * correction,
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point[1] * correction
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], numvertex
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]);
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}
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} while (i--);
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self.postMessage(points);
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}, false);
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}()); |