package com.ard.data.region.utils;
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import com.ard.data.region.domain.Coordinate;
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import org.springframework.util.CollectionUtils;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.stream.Collectors;
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/**
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* 区域坐标工具类
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*
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* @author ruoyi
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*/
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public class RegionCoordinateUtils {
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/**
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* 根据坐标数量自动判断区域类型
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*
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* @param coordinates 坐标集合
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* @return POINT/LINE/POLYGON
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*/
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public static String getRegionTypeByCoordinates(List<Coordinate> coordinates) {
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if (CollectionUtils.isEmpty(coordinates)) {
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throw new RuntimeException("坐标集合不能为空");
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}
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int size = coordinates.size();
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if (size == 1) {
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return "POINT";
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} else if (size == 2) {
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return "LINE";
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} else {
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return "POLYGON";
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}
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}
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/**
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* 将坐标集合转换为 WKT 格式（自动判断类型）
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*/
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public static String toWkt(List<Coordinate> coordinates) {
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if (CollectionUtils.isEmpty(coordinates)) {
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throw new RuntimeException("坐标集合不能为空");
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}
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int size = coordinates.size();
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if (size == 1) {
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// 点
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Coordinate coord = coordinates.get(0);
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return String.format("POINT(%s)", coord.toLatLngString());
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} else if (size == 2) {
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// 线
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List<String> points = coordinates.stream()
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.map(Coordinate::toLatLngString)
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.collect(Collectors.toList());
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return String.format("LINESTRING(%s, %s)", points.get(0), points.get(1));
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} else {
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// 面（多边形）
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List<String> points = coordinates.stream()
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.map(Coordinate::toLatLngString)
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.collect(Collectors.toList());
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String allPoints = String.join(", ", points);
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String firstPoint = points.get(0);
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return String.format("POLYGON((%s, %s))", allPoints, firstPoint);
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}
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}
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/**
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* 将 WKT 字符串转换为坐标集合
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*
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* @param wkt 如：POLYGON((45.718839 126.670721, 45.708756 126.670151, ...))
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* @return 坐标集合
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*/
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public static List<Coordinate> toCoordinates(String wkt) {
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List<Coordinate> coordinates = new ArrayList<>();
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if (wkt == null || wkt.isEmpty()) {
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return coordinates;
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}
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// 提取括号内的坐标字符串
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String coordStr = wkt;
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if (wkt.startsWith("POLYGON")) {
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coordStr = wkt.substring(wkt.indexOf("((") + 2, wkt.lastIndexOf("))"));
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} else if (wkt.startsWith("LINESTRING")) {
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coordStr = wkt.substring(wkt.indexOf("(") + 1, wkt.lastIndexOf(")"));
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} else if (wkt.startsWith("POINT")) {
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coordStr = wkt.substring(wkt.indexOf("(") + 1, wkt.lastIndexOf(")"));
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}
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// 分割坐标点
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String[] points = coordStr.split(",");
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for (String point : points) {
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String[] lngLat = point.trim().split(" ");
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if (lngLat.length >= 2) {
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Double lat = Double.parseDouble(lngLat[0]);
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Double lng = Double.parseDouble(lngLat[1]);
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coordinates.add(new Coordinate(lng, lat));
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}
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}
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return coordinates;
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}
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/**
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* 计算中心点
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*/
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public static Coordinate calculateCenter(List<Coordinate> coordinates) {
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if (CollectionUtils.isEmpty(coordinates)) {
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return null;
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}
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double sumLng = 0;
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double sumLat = 0;
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for (Coordinate coord : coordinates) {
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sumLng += coord.getLng();
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sumLat += coord.getLat();
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}
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return new Coordinate(sumLng / coordinates.size(), sumLat / coordinates.size());
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}
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/**
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* 计算面积（仅面类型有效）
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*/
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public static double calculateArea(List<Coordinate> coordinates) {
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if (coordinates == null || coordinates.size() < 3) {
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return 0;
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}
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double area = 0;
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int n = coordinates.size();
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for (int i = 0; i < n; i++) {
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Coordinate current = coordinates.get(i);
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Coordinate next = coordinates.get((i + 1) % n);
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area += current.getLng() * next.getLat() - next.getLng() * current.getLat();
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}
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area = Math.abs(area) / 2;
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double lat = coordinates.get(0).getLat();
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double meterPerDegree = 111000 * Math.cos(Math.toRadians(lat));
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return area * meterPerDegree * 111000;
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}
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/**
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* 验证坐标集合
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*/
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public static void validateCoordinates(List<Coordinate> coordinates) {
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if (CollectionUtils.isEmpty(coordinates)) {
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throw new RuntimeException("坐标集合不能为空");
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}
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for (Coordinate coord : coordinates) {
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if (!coord.isValid()) {
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throw new RuntimeException("无效坐标");
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}
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}
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}
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}
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