32 lines
1.1 KiB
JavaScript
32 lines
1.1 KiB
JavaScript
import { Meteor } from 'meteor/meteor';
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import Subscriptions from '../Subscriptions';
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import Perlin from 'loms.perlin';
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Perlin.seed(Math.random());
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Meteor.publishTransformed('userSubsToFires', function () {
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// https://en.wikipedia.org/wiki/Location_obfuscation
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// https://en.wikipedia.org/wiki/Decimal_degrees#Precision
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// https://gis.stackexchange.com/questions/27792/what-simple-effective-techniques-for-obfuscating-points-are-available
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return Subscriptions.find().serverTransform(function (doc) {
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var location = doc.location;
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/* doc.lat = location.lat;
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* doc.lon = location.lon; */
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if (location) {
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doc.lat = Math.round(location.lat * 10) / 10;
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doc.lon = Math.round(location.lon * 10) / 10;
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}
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// console.log(`[${doc.lat}, ${doc.lon}]`);
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var noiseBase = Perlin.perlin2(doc.lat, doc.lon);
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var noise = Math.abs(noiseBase / 3);
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// console.log(`Noise ${noise}, abs: ${Math.abs(noise)}`);
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doc.lat += noise;
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doc.lon += noise;
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doc.distance += noiseBase;
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// console.log(`with noise: [${doc.lat}, ${doc.lon}]`);
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delete doc.chatId;
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delete doc.geo;
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delete doc.location;
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return doc;
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});
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});
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