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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | /**
* 测量地理坐标的距离
* @method measureDistance
* @param {Number} lat1 坐标1经度
* @param {Number} lng1 坐标1纬度
* @param {Number} lat2 坐标2经度
* @param {Number} lng2 坐标2纬度
* @return {Number} 2个坐标之间的距离（千米）
* @example
* import { measureDistance } from '@spore-ui/tskit';
* measureDistance(0, 0, 100, 100); // 9826.40065109978
*/
export function measureDistance(
lat1: number,
lng1: number,
lat2: number,
lng2: number,
): number {
const radLat1 = (lat1 * Math.PI) / 180.0;
const radLat2 = (lat2 * Math.PI) / 180.0;
const a = radLat1 - radLat2;
const b = (lng1 * Math.PI) / 180.0 - (lng2 * Math.PI) / 180.0;
const powVal = Math.sin(a / 2) ** 2;
const ccpVal = Math.cos(radLat1) * Math.cos(radLat2) * (Math.sin(b / 2) ** 2);
const sqrtVal = Math.sqrt(powVal + ccpVal);
let s = 2 * Math.asin(sqrtVal);
// 地球半径
s *= 6378.137;
return s;
}
export default measureDistance;
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