121 lines
3.4 KiB
JavaScript
121 lines
3.4 KiB
JavaScript
import 'ol/ol.css';
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import {Map as olMap, View} from 'ol';
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import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';
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import {OSM, Vector as VectorSource} from 'ol/source';
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import Feature from 'ol/Feature';
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import {fromLonLat} from 'ol/proj';
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import {Icon, Stroke, Style} from 'ol/style';
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import Projection from 'ol/proj/Projection';
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import {LineString, Point} from 'ol/geom';
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import {readFileSync} from 'fs';
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const packetLog = readFileSync(__dirname + '/../IS_packets.txt', 'utf-8');
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import {APRSParser} from 'aprs-parser';
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import icon from "./arrow.png";
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let tile_layer = new TileLayer({source: new OSM()});
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let map = new olMap({
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target: 'map',
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layers: [
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tile_layer
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],
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view: new View({
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center: fromLonLat([-72.15, 43.90]),
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zoom: 10
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})
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});
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let colorGen = {
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hues: null,
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get: function (totalNum) {
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if (this.hues === null) {
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let mult = Math.floor(360 / totalNum);
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this.hues = Array.from(Array(totalNum).keys())
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.map(x => x * mult);
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// Shuffle (this is not a great shuffle, but I don't care)
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this.hues.forEach((current, index, arr) => {
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let randomIndex = Math.floor(Math.random() * index);
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[arr[index], arr[randomIndex]] =
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[arr[randomIndex], arr[index]];
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});
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}
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return this.hues.pop();
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}
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};
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function pathStyle(feature) {
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let styles = [
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new Style({stroke: new Stroke(
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{color: 'hsl(' + feature.getProperties().hue + ', 75%, 50%)', width: 2}
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)})
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];
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feature.getGeometry().forEachSegment((start, end) => {
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let dx = end[0] - start[0];
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let dy = end[1] - start[1];
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let rotation = Math.atan2(dy, dx);
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// arrows
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styles.push(new Style({
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geometry: new Point(end),
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image: new Icon({
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src: icon,
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anchor: [0.75, 0.5],
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rotateWithView: true,
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rotation: -rotation
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})
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}));
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});
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return styles;
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}
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function plotPaths(packets) {
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let vector_layer = new VectorLayer({source: new VectorSource()});
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map.addLayer(vector_layer);
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packets
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.filter(packet => packet.date > new Date("2018-07-14") && packet.date < new Date("2018-07-15"))
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// filter by callsign
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.filter(packet => (packet.from !== undefined) &&
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(packet.from.toString() === "W1HS-9"))
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// filter to just positional data
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.filter(packet => 'data' in packet && 'latitude' in packet.data)
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// join into Arrays of points
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.reduce((acc, packet) => {
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if (!acc.has(packet.from.toString())) acc.set(packet.from.toString(), []);
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acc.get(packet.from.toString()).push([packet.data.longitude,
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packet.data.latitude]);
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return acc;
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}, new Map())
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// plot on map
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.forEach((points, callsign, map) => {
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let pathFeature = new Feature({
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geometry: new LineString(points),
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hue: colorGen.get(map.size)
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});
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pathFeature.setStyle(pathStyle);
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vector_layer.getSource().addFeature(pathFeature);
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pathFeature.getGeometry().transform(new Projection({code: "EPSG:4326"}),
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tile_layer.getSource().getProjection());
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});
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}
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function parsePackets(packetLog) {
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let parser = new APRSParser();
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return packetLog.trim().split("\n")
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// parse to Date and APRS packet
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.map(line => {
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let packet = parser.parse(line.slice(29));
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packet.date = new Date(line.slice(0,18));
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return packet;
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});
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}
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let packets = parsePackets(packetLog);
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plotPaths(packets);
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