58 lines
1.7 KiB
TypeScript
58 lines
1.7 KiB
TypeScript
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/*
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Copyright 2022 The Matrix.org Foundation C.I.C
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { Beacon } from "matrix-js-sdk/src/matrix";
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import { parseGeoUri } from "../location";
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export type Bounds = {
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north: number;
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east: number;
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west: number;
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south: number;
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};
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/**
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* Get the geo bounds of given list of beacons
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*
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* Latitude:
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* equator: 0, North pole: 90, South pole -90
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* Longitude:
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* Prime Meridian (Greenwich): 0
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* east of Greenwich has a positive longitude, max 180
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* west of Greenwich has a negative longitude, min -180
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*/
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export const getBeaconBounds = (beacons: Beacon[]): Bounds | undefined => {
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const coords = beacons
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.filter((beacon) => !!beacon.latestLocationState)
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.map((beacon) => parseGeoUri(beacon.latestLocationState.uri));
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if (!coords.length) {
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return;
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}
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// sort descending
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const sortedByLat = [...coords].sort((left, right) => right.latitude - left.latitude);
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const sortedByLong = [...coords].sort((left, right) => right.longitude - left.longitude);
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return {
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north: sortedByLat[0].latitude,
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south: sortedByLat[sortedByLat.length - 1].latitude,
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east: sortedByLong[0].longitude,
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west: sortedByLong[sortedByLong.length - 1].longitude,
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};
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};
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