123 lines
3.8 KiB
JavaScript
123 lines
3.8 KiB
JavaScript
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import {
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MOCK_LOCATION_GPX_PLAYBACK_SPEED,
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MOCK_LOCATION_UPDATE_INTERVAL,
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MOCK_LOCATION_USE_GPX,
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MOCK_LOCATION_LAT_MIN, MOCK_LOCATION_LAT_MAX,
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MOCK_LOCATION_LNG_MIN, MOCK_LOCATION_LNG_MAX,
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} from '@/constants';
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let mockGPX = [];
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if (process.env.NODE_ENV !== 'production') {
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// Use a node_modules require here, this is handled by Webpack to fetch either
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// a custom mock_gpx.json or a default empty one.
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mockGPX = require('mock_gpx.json'); // eslint-disable-line global-require
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}
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/**
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* Cheap distance computation based on
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* https://blog.mapbox.com/fast-geodesic-approximations-with-cheap-ruler-106f229ad016.
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*/
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export function distance(latLng1, latLng2) {
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const cos = Math.cos((latLng1[0] + latLng2[0]) / 2 * Math.PI / 180);
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const cos2 = 2 * cos * cos - 1;
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const cos3 = 2 * cos * cos2 - cos;
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const cos4 = 2 * cos * cos3 - cos2;
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const cos5 = 2 * cos * cos4 - cos3;
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// Multipliers for converting longitude and latitude degrees into distance
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// (http://1.usa.gov/1Wb1bv7)
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const kx = 1000 * (111.41513 * cos - 0.09455 * cos3 + 0.00012 * cos5);
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const ky = 1000 * (111.13209 - 0.56605 * cos2 + 0.0012 * cos4);
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const dx = (latLng1[1] - latLng2[1]) * kx;
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const dy = (latLng1[0] - latLng2[0]) * ky;
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return Math.sqrt(dx * dx + dy * dy);
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}
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export function mockLocationRandom() {
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let heading = null;
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if (Math.random() > 0.25) {
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heading = Math.random() * 360;
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}
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let speed = null;
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if (Math.random() > 0.25) {
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speed = Math.random() * 9; // in meters/s
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}
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const newLocation = {
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coords: {
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accuracy: Math.random() * 100, // In meters
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latitude: (
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(Math.random() * (MOCK_LOCATION_LAT_MAX - MOCK_LOCATION_LAT_MIN))
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+ MOCK_LOCATION_LAT_MIN
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),
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longitude: (
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(Math.random() * (MOCK_LOCATION_LNG_MAX - MOCK_LOCATION_LNG_MIN))
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+ MOCK_LOCATION_LNG_MIN
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),
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heading,
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speed,
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},
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timestamp: new Date().getTime(),
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};
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console.log('New mock location: ', newLocation);
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return newLocation;
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}
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export function mockLocationWithGPX(index, setPosition) {
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if (mockGPX[index]) {
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setPosition(mockGPX[index]);
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if (mockGPX[index + 1]) {
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const delay = (
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Date.parse(mockGPX[index + 1].time)
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- Date.parse(mockGPX[index].time)
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);
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setTimeout(
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() => mockLocationWithGPX(index + 1, setPosition),
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delay / MOCK_LOCATION_GPX_PLAYBACK_SPEED,
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);
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}
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}
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}
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export function mockLocation(setPosition) {
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if (MOCK_LOCATION_USE_GPX) {
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mockLocationWithGPX(0, setPosition);
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return -1; // Return a fake setInterval id
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}
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setPosition(mockLocationRandom());
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return setInterval(
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() => setPosition(mockLocationRandom()),
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MOCK_LOCATION_UPDATE_INTERVAL,
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);
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}
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export function storageAvailable(type) {
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let storage;
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try {
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storage = window[type];
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const x = '__storage_test__';
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storage.setItem(x, x);
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storage.removeItem(x);
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return true;
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} catch (e) {
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return e instanceof DOMException && (
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// everything except Firefox
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e.code === 22
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// Firefox
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|| e.code === 1014
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// test name field too, because code might not be present
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// everything except Firefox
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|| e.name === 'QuotaExceededError'
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// Firefox
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|| e.name === 'NS_ERROR_DOM_QUOTA_REACHED'
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)
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// acknowledge QuotaExceededError only if there's something already stored
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&& storage.length !== 0;
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}
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}
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export function capitalize(string) {
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return string.charAt(0).toUpperCase() + string.slice(1);
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}
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