package com.panzhihua.service_community.util;
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import lombok.extern.slf4j.Slf4j;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* @ClassName: MapDistance
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* @Author: yh
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* @Date: 2022/11/11 15:21
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* @Description: 经纬度处理
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*/
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@Slf4j
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public class MapDistance {
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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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private static final double EARTH_RADIUS1 = 6370996.81;
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// 弧度
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private static double radian(double d) {
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return d * Math.PI / 180.0;
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}
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public static Double distanceOfTwoPoints(String lat1Str, String lng1Str, String lat2Str, String lng2Str) {
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Double lat1 = Double.parseDouble(lat1Str);
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Double lng1 = Double.parseDouble(lng1Str);
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Double lat2 = Double.parseDouble(lat2Str);
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Double lng2 = Double.parseDouble(lng2Str);
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double radLat1 = radian(lat1);
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double radLat2 = radian(lat2);
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double a = radLat1 - radLat2;
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double b = radian(lng1) - radian(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) * Math.pow(Math.sin(b / 2), 2)));
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s = s * EARTH_RADIUS1;
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s = Math.round(s * 10000) / 10000;
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return s;
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}
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/**
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* 根据两个位置的经纬度，来计算两地的距离（单位为KM）
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* 参数为String类型
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* @return
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*/
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public static String getDistance(String lat1Str, String lng1Str, String lat2Str, String lng2Str) {
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Double lat1 = Double.parseDouble(lat1Str);
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Double lng1 = Double.parseDouble(lng1Str);
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Double lat2 = Double.parseDouble(lat2Str);
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Double lng2 = Double.parseDouble(lng2Str);
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double patm = 2;
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double radLat1 = rad(lat1);
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double radLat2 = rad(lat2);
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double difference = radLat1 - radLat2;
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double mdifference = rad(lng1) - rad(lng2);
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double distance = patm * Math.asin(Math.sqrt(Math.pow(Math.sin(difference / patm), patm)
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+ Math.cos(radLat1) * Math.cos(radLat2)
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* Math.pow(Math.sin(mdifference / patm), patm)));
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distance = distance * EARTH_RADIUS;
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String distanceStr = String.valueOf(distance);
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return distanceStr;
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}
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/**
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* 获取当前用户一定距离以内的经纬度值
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* 单位米 return minLat
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* 最小经度 minLng
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* 最小纬度 maxLat
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* 最大经度 maxLng
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* 最大纬度 minLat
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*/
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public static Map<Object,Object> getAround(String latStr, String lngStr, double raidusMile) {
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log.info("latStr："+latStr+"，lngStr："+lngStr+"，raidusMile:"+raidusMile);
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Map<Object,Object> map = new HashMap<Object,Object>();
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Double latitude = Double.parseDouble(latStr);// 传值给经度
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Double longitude = Double.parseDouble(lngStr);// 传值给纬度
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Double degree = (24901 * 1609) / 360.0; // 获取每度
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// double raidusMile = Double.parseDouble(raidus);
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Double mpdLng = Double.parseDouble((degree * Math.cos(latitude * (Math.PI / 180))+"").replace("-", ""));
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Double dpmLng = 1 / mpdLng;
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Double radiusLng = dpmLng * raidusMile;
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//获取最小经度
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Double minLat = longitude - radiusLng;
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// 获取最大经度
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Double maxLat = longitude + radiusLng;
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Double dpmLat = 1 / degree;
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Double radiusLat = dpmLat * raidusMile;
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// 获取最小纬度
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Double minLng = latitude - radiusLat;
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// 获取最大纬度
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Double maxLng = latitude + radiusLat;
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map.put("minLat", minLat+"");
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map.put("maxLat", maxLat+"");
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map.put("minLng", minLng+"");
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map.put("maxLng", maxLng+"");
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return map;
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}
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public static void main(String[] args) {
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//济南国际会展中心经纬度：117.11811 36.68484
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//趵突泉：117.00999000000002 36.66123
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//103.962128,30.57568
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//103.957232,30.636726
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// System.out.println(getDistance("30.57568","103.962128","30.636726","103.957232"));
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//103.842654,30.560987
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System.out.println(getAround("104.082679", "30.592872", 900000d));
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//117.01028712333508(Double), 117.22593287666493(Double),
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//36.44829619896034(Double), 36.92138380103966(Double)
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//104.03035080138962(String), 104.12020319861038(String), 30.271352899925574(String), 30.64081710007443(String)
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// distanceOfTwoPoints("30.57568","103.962128","30.636726","103.957232");
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}
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}
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