小程序优化，商铺定位等

2026-07-27 22:33:00 +08:00
parent 1725b9e4b4
commit 23c0cc7a5f
15 changed files with 441 additions and 41 deletions
@@ -0,0 +1,23 @@
+/** 球面距离（米） */
+export function haversineMeters(
+  lat1: number,
+  lng1: number,
+  lat2: number,
+  lng2: number,
+): number {
+  const toRad = (d: number) => (d * Math.PI) / 180;
+  const R = 6371000;
+  const dLat = toRad(lat2 - lat1);
+  const dLng = toRad(lng2 - lng1);
+  const a =
+    Math.sin(dLat / 2) ** 2 +
+    Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) * Math.sin(dLng / 2) ** 2;
+  return 2 * R * Math.asin(Math.min(1, Math.sqrt(a)));
+}
+
+export function formatDistanceMeters(meters: number | null | undefined): string {
+  if (meters == null || !Number.isFinite(meters) || meters < 0) return '—';
+  if (meters < 1000) return `${Math.max(1, Math.round(meters))}m`;
+  const km = meters / 1000;
+  return `${km < 10 ? km.toFixed(1) : Math.round(km)}km`;
+}