24 lines
773 B
TypeScript
24 lines
773 B
TypeScript
/** 球面距离（米） */
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export function haversineMeters(
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lat1: number,
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lng1: number,
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lat2: number,
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lng2: number,
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): number {
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const toRad = (d: number) => (d * Math.PI) / 180;
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const R = 6371000;
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const dLat = toRad(lat2 - lat1);
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const dLng = toRad(lng2 - lng1);
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const a =
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Math.sin(dLat / 2) ** 2 +
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Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) * Math.sin(dLng / 2) ** 2;
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return 2 * R * Math.asin(Math.min(1, Math.sqrt(a)));
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}
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export function formatDistanceMeters(meters: number | null | undefined): string {
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if (meters == null || !Number.isFinite(meters) || meters < 0) return '—';
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if (meters < 1000) return `${Math.max(1, Math.round(meters))}m`;
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const km = meters / 1000;
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return `${km < 10 ? km.toFixed(1) : Math.round(km)}km`;
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}
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