57 lines
2.0 KiB
TypeScript
57 lines
2.0 KiB
TypeScript
const PROVIDER = 'https://maps.google.com/maps';
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// https://github.com/TelegramMessenger/Telegram-iOS/blob/2a32c871882c4e1b1ccdecd34fccd301723b30d9/submodules/LocationResources/Sources/VenueIconResources.swift#L82
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const VENUE_COLORS = new Map(Object.entries({
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'building/medical': '#43b3f4',
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'building/gym': '#43b3f4',
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'education/cafeteria': '#f7943f',
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'travel/bedandbreakfast': '#9987ff',
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'travel/hotel': '#9987ff',
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'travel/hostel': '#9987ff',
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'travel/resort': '#9987ff',
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'travel/hotel_bar': '#e56dd6',
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arts_entertainment: '#e56dd6',
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building: '#6e81b2',
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education: '#a57348',
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event: '#959595',
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food: '#f7943f',
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home: '#00aeef',
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nightlife: '#e56dd6',
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parks_outdoors: '#6cc039',
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shops: '#ffb300',
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travel: '#1c9fff',
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work: '#ad7854',
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}));
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const RANDOM_COLORS = [
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'#e56cd5', '#f89440', '#9986ff', '#44b3f5', '#6dc139', '#ff5d5a', '#f87aad', '#6e82b3', '#f5ba21',
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];
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export function prepareMapUrl(lat: number, long: number, zoom: number) {
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return `${PROVIDER}/place/${lat}+${long}/@${lat},${long},${zoom}z`;
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}
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export function getMetersPerPixel(lat: number, zoom: number) {
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// https://groups.google.com/g/google-maps-js-api-v3/c/hDRO4oHVSeM/m/osOYQYXg2oUJ
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return (156543.03392 * Math.cos(lat * (Math.PI / 180))) / 2 ** zoom;
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}
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export function getVenueIconUrl(type?: string) {
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if (!type) return '';
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return `https://ss3.4sqi.net/img/categories_v2/${type}_88.png`;
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}
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// https://github.com/TelegramMessenger/Telegram-iOS/blob/2a32c871882c4e1b1ccdecd34fccd301723b30d9/submodules/LocationResources/Sources/VenueIconResources.swift#L104
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export function getVenueColor(type?: string) {
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if (!type) return '#008df2';
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return VENUE_COLORS.get(type)
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|| VENUE_COLORS.get(type.split('/')[0])
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|| RANDOM_COLORS[stringToNumber(type) % RANDOM_COLORS.length];
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}
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function stringToNumber(str: string) {
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return str.split('').reduce((prevHash, currVal) => (
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// eslint-disable-next-line no-bitwise
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(((prevHash << 5) - prevHash) + currVal.charCodeAt(0)) | 0), 0);
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}
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