| 1 | /* |
| 2 | * @Author: nevin |
| 3 | * @Date: 2024-07-29 11:14:20 |
| 4 | * @LastEditTime: 2024-07-29 11:17:33 |
| 5 | * @LastEditors: nevin |
| 6 | * @Description: 地图 |
| 7 | */ |
| 8 | export function isWithinMeters( |
| 9 | locus1: number[], |
| 10 | locus2: number[], |
| 11 | distanceInMeters: number, // 千米 |
| 12 | ) { |
| 13 | const [lat1, lon1] = locus1 |
| 14 | const [lat2, lon2] = locus2 |
| 15 | |
| 16 | const R = 6371 // 地球平均半径，单位为公里 |
| 17 | const dLat = deg2rad(lat2 - lat1) |
| 18 | const dLon = deg2rad(lon2 - lon1) |
| 19 | const a |
| 20 | = Math.sin(dLat / 2) * Math.sin(dLat / 2) |
| 21 | + Math.cos(deg2rad(lat1)) |
| 22 | * Math.cos(deg2rad(lat2)) |
| 23 | * Math.sin(dLon / 2) |
| 24 | * Math.sin(dLon / 2) |
| 25 | const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)) |
| 26 | const distance = R * c // 距离，单位为公里 |
| 27 | |
| 28 | return distance <= distanceInMeters // 判断距离是否小于等于500米 |
| 29 | } |
| 30 | |
| 31 | // 辅助函数，将角度转换为弧度 |
| 32 | function deg2rad(deg: number) { |
| 33 | return deg * (Math.PI / 180) |
| 34 | } |
| 35 |