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73 lines
1.7 KiB
73 lines
1.7 KiB
2 years ago
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function test() {
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return 1 + 1
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}
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/**
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* 获取两个经纬度之间的距离
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* @param lat1 第一点的纬度
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* @param lng1 第一点的经度
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* @param lat2 第二点的纬度
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* @param lng2 第二点的经度
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* @returns {Number}
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*/
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function getRad(d) {
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var PI = Math.PI;
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return d * PI / 180.0;
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}
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function getDistance(lat1, lng1, lat2, lng2) {
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var f = getRad((lat1 + lat2) / 2);
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var g = getRad((lat1 - lat2) / 2);
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var l = getRad((lng1 - lng2) / 2);
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var sg = Math.sin(g);
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var sl = Math.sin(l);
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var sf = Math.sin(f);
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var s, c, w, r, d, h1, h2;
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var a = 6378137.0; //The Radius of eath in meter.
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var fl = 1 / 298.257;
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sg = sg * sg;
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sl = sl * sl;
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sf = sf * sf;
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s = sg * (1 - sl) + (1 - sf) * sl;
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c = (1 - sg) * (1 - sl) + sf * sl;
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w = Math.atan(Math.sqrt(s / c));
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r = Math.sqrt(s * c) / w;
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d = 2 * w * a;
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h1 = (3 * r - 1) / 2 / c;
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h2 = (3 * r + 1) / 2 / s;
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s = d * (1 + fl * (h1 * sf * (1 - sg) - h2 * (1 - sf) * sg));
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// s = s/1000;
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s = s.toFixed(2); //指定小数点后的位数。
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return s;
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}
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function ab2str(buf) {
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return String.fromCharCode.apply(null, new Uint16Array(buf));
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}
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function str2ab(str) {
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var buf = new ArrayBuffer(str.length * 2); // 2 bytes for each char
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var bufView = new Uint16Array(buf);
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for (var i = 0, strLen = str.length; i < strLen; i++) {
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bufView[i] = str.charCodeAt(i);
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}
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return buf;
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}
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function distance(res){
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let ALWAYS = [];
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res.markes.forEach((item,index)=>{
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let distance = utils.getDistance(res.coordinate.latitude,res.coordinate.longitude,item.latitude, item.longitude);
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if(distance<1000){
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ALWAYS.push(index)
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}
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});
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return ALWAYS
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}
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module.exports = {
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distance:distance,
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test: test,
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ab2str: ab2str,
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str2ab: str2ab,
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getDistance: getDistance
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}
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