package com.yqzx.common.util;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* 计算坐标距离工具类
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*
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* @Author: lc
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* @Date: 2019/5/23 19:10
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*/
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public class DistanceUtil {
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private static double EARTH_RADIUS = 6378.137;
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private static double rad(double d) {
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return d * Math.PI / 180.0;
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}
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/**
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* 通过经纬度获取距离(单位：米)
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*
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* @Author: lc
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* @Date: 2019/5/23 19:14
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*/
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public static double getDistance(double lat1, double lng1, double lat2, double lng2) {
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double radLat1 = rad(lat1);
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double radLat2 = rad(lat2);
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double a = radLat1 - radLat2;
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double b = rad(lng1) - rad(lng2);
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double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
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+ Math.cos(radLat1) * Math.cos(radLat2)
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* Math.pow(Math.sin(b / 2), 2)));
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s = s * EARTH_RADIUS;
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s = Math.round(s * 10000d) / 10000d;
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s = s * 1000;
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return s;
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}
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/**
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* 腾讯地图转换成百度地图坐标
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* @param lng 腾讯经度
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* @param lat 腾讯纬度
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* @return 返回结果：经度,纬度
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*/
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public static Map<String, Double> txTransBd(double lng, double lat){
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double x = lng, y = lat;
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double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * Math.PI);
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double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * Math.PI);
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double bd_lng = z * Math.cos(theta) + 0.0065;
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double bd_lat = z * Math.sin(theta) + 0.006;
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Map<String, Double> map = new HashMap<>();
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map.put("lng", bd_lng);
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map.put("lat", bd_lat);
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return map;
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}
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/**
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* 百度地图坐标转换成腾讯地图坐标
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* @param lng 百度经度
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* @param lat 百度纬度
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* @return 返回结果：纬度,经度
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*/
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public static String bdTransTx(double lng, double lat){
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double x = lng - 0.0065, y = lat - 0.006;
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double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * Math.PI);
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double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * Math.PI);
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double tx_lng = z * Math.cos(theta);
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double tx_lat = z * Math.sin(theta);
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return tx_lat+","+tx_lng;
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}
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}
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