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37 lines
936 B
37 lines
936 B
/**
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* @desc 根据两点间的经纬度计算距离
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* @param float $lat 纬度值
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* @param float $lng 经度值
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*/
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const getDistance = (lat1, lon1, lat2, lon2) => {
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console.log(lat1)
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console.log(lon1)
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console.log(lat2)
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console.log(lon2)
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let ew1, ns1, ew2, ns2;
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let distance;
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// 角度转换为弧度
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ew1 = lon1 * 0.01745329252;
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ns1 = lat1 * 0.01745329252;
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ew2 = lon2 * 0.01745329252;
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ns2 = lat2 * 0.01745329252;
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distance = distance = Math.sin(ns1) * Math.sin(ns2) + Math.cos(ns1) * Math.cos(ns2) *
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Math.cos(ew1 - ew2);
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// 调整到[-1..1]范围内，避免溢出
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if (distance > 1.0)
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distance = 1.0;
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else if (distance < -1.0)
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distance = -1.0;
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// 求大圆劣弧长度
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distance = 6370693.5 * Math.acos(distance);
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let isBig = false; // 是否为大于等于1000m
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if (distance >= 1000) {
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distance /= 1000;
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isBig = true;
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}
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return distance.toFixed(2) + (isBig ? "km" : "m");
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}
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export default getDistance
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