package com.moral.api.utils;
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import com.moral.api.entity.GeoCoordinate;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* @program: screen
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* @description: 计算多个地点的中心点
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* @author: lizijie
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* @create: 2021-12-09 16:37
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**/
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public class GetCenterPointFromListOfCoordinates {
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/**
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* 根据输入的地点坐标计算中心点
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* @param geoCoordinateList
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* @return
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*/
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public static GeoCoordinate getCenterPoint(List<GeoCoordinate> geoCoordinateList) {
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int total = geoCoordinateList.size();
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double X = 0, Y = 0, Z = 0;
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for (GeoCoordinate g : geoCoordinateList) {
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double lat, lon, x, y, z;
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lat = g.getLatitude() * Math.PI / 180;
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lon = g.getLongitude() * Math.PI / 180;
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x = Math.cos(lat) * Math.cos(lon);
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y = Math.cos(lat) * Math.sin(lon);
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z = Math.sin(lat);
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X += x;
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Y += y;
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Z += z;
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}
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X = X / total;
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Y = Y / total;
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Z = Z / total;
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double Lon = Math.atan2(Y, X);
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double Hyp = Math.sqrt(X * X + Y * Y);
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double Lat = Math.atan2(Z, Hyp);
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return new GeoCoordinate(Lat * 180 / Math.PI, Lon * 180 / Math.PI);
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}
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/**
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* 根据输入的地点坐标计算中心点（适用于400km以下的场合）
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* @param geoCoordinateList
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* @return
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*/
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public static GeoCoordinate getCenterPoint400(List<GeoCoordinate> geoCoordinateList) {
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// 以下为简化方法（400km以内）
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int total = geoCoordinateList.size();
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double lat = 0, lon = 0;
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for (GeoCoordinate g : geoCoordinateList) {
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lat += g.getLatitude() * Math.PI / 180;
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lon += g.getLongitude() * Math.PI / 180;
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}
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lat /= total;
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lon /= total;
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return new GeoCoordinate(lat * 180 / Math.PI, lon * 180 / Math.PI);
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}
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public static void main(String[] args) {
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List geoCoordinateList = new ArrayList();
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GeoCoordinate g = new GeoCoordinate();
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g.setLongitude(112.977324);
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g.setLatitude(28.178376);
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GeoCoordinate g2 = new GeoCoordinate();
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g2.setLongitude(112.975782);
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g2.setLatitude(28.172258);
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geoCoordinateList.add(g);
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geoCoordinateList.add(g2);
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GeoCoordinate re = GetCenterPointFromListOfCoordinates.getCenterPoint(geoCoordinateList);
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System.out.println(re.getLongitude() +" "+ re.getLatitude());
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}
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}
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