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60 lines
1.5 KiB
TypeScript
60 lines
1.5 KiB
TypeScript
/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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export type Unit =
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| 'square_m'
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| 'radius_m'
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| 'radius_km'
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| 'radius_miles'
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| 'square_km'
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| 'square_miles';
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export const defaultViewport = {
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bearing: 0,
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latitude: 31.222656842808707,
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longitude: 6.85236157047845,
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pitch: 0,
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zoom: 1,
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};
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const METER_TO_MILE = 1609.34;
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export function unitToRadius(unit: Unit, num: number) {
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if (unit === 'square_m') {
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return Math.sqrt(num / Math.PI);
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}
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if (unit === 'radius_m') {
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return num;
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}
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if (unit === 'radius_km') {
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return num * 1000;
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}
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if (unit === 'radius_miles') {
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return num * METER_TO_MILE;
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}
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if (unit === 'square_km') {
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return Math.sqrt(num / Math.PI) * 1000;
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}
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if (unit === 'square_miles') {
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return Math.sqrt(num / Math.PI) * METER_TO_MILE;
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}
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return null;
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}
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