34 lines
1.0 KiB
JavaScript
34 lines
1.0 KiB
JavaScript
(function (ns) {
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'use strict';
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const radians = value => value * Math.PI / 180;
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const degrees = value => value * 180 / Math.PI;
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const normalizeDegrees = value => (value % 360 + 360) % 360;
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ns.Distance = {
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meters(a, b) {
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const dLat = radians(b.lat - a.lat);
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const dLon = radians(b.lon - a.lon);
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const h = Math.sin(dLat / 2) ** 2
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+ Math.cos(radians(a.lat)) * Math.cos(radians(b.lat)) * Math.sin(dLon / 2) ** 2;
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return 2 * 6371000 * Math.asin(Math.sqrt(h));
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},
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bearing(a, b) {
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const lat1 = radians(a.lat);
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const lat2 = radians(b.lat);
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const dLon = radians(b.lon - a.lon);
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const y = Math.sin(dLon) * Math.cos(lat2);
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const x = Math.cos(lat1) * Math.sin(lat2)
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- Math.sin(lat1) * Math.cos(lat2) * Math.cos(dLon);
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return normalizeDegrees(degrees(Math.atan2(y, x)));
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},
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normalizeDegrees,
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format(meters) {
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return meters < 1000 ? `${Math.round(meters)} m` : `${(meters / 1000).toFixed(1)} km`;
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}
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};
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}(window.Wegwichtel));
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