package org.sxkj.gd.utils;
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import org.geotools.geometry.DirectPosition2D;
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import org.geotools.geometry.jts.JTS;
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import org.geotools.referencing.CRS;
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import org.geotools.referencing.crs.DefaultGeographicCRS;
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import org.locationtech.jts.geom.*;
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import org.opengis.referencing.crs.CoordinateReferenceSystem;
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import org.opengis.referencing.operation.MathTransform;
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/**
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* @Description TODO 航线拆分工具类
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* @Author AIX
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* @Date 2025/6/26 9:48
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* @Version 1.0
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*/
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public class GeomUtils {
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private static final GeometryFactory geometryFactory = new GeometryFactory();
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/**
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* 获取指定点周围指定距离（米）内的多边形区域
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*
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* @param lon 中心点经度
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* @param lat 中心点纬度
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* @param distance 距离（米）
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* @return 多边形几何对象
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*/
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public static Geometry getAreaWithinDistance(double lon, double lat, double distance) throws Exception {
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// 创建投影CRS（使用UTM投影，适用于小范围距离计算）
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CoordinateReferenceSystem auto = CRS.decode("AUTO:42001," + lon + "," + lat);
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// 源CRS（WGS84）
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CoordinateReferenceSystem sourceCRS = DefaultGeographicCRS.WGS84;
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// 转换到投影CRS
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MathTransform toTransform = CRS.findMathTransform(sourceCRS, auto);
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// 转换回WGS84
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MathTransform fromTransform = CRS.findMathTransform(auto, sourceCRS);
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// 转换中心点到投影坐标系
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DirectPosition2D src = new DirectPosition2D(sourceCRS, lon, lat);
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DirectPosition2D dest = new DirectPosition2D();
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toTransform.transform(src, dest);
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// 在投影坐标系中创建缓冲区（距离单位为米）
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Point projPoint = geometryFactory.createPoint(new Coordinate(dest.x, dest.y));
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Geometry buffer = projPoint.buffer(distance);
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// 转换回WGS84坐标系
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Geometry transformedBuffer = JTS.transform(buffer, fromTransform);
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return transformedBuffer;
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}
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/**
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* 获取某点周围指定距离（米）的缓冲区
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*/
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public static Polygon getBufferAroundPoint(double lon, double lat, double distance) throws Exception {
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Geometry area = getAreaWithinDistance(lon, lat, distance);
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return (Polygon) area;
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}
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/**
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* 获取某点周围指定距离（米）的缓冲区，返回WKT字符串格式
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*
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* @param lon 中心点经度
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* @param lat 中心点纬度
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* @param distance 距离（米）
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* @return WKT格式的多边形字符串，格式：POLYGON((lon1 lat1, lon2 lat2, ...))
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*/
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public static String getBufferAroundPointAsString(double lon, double lat, double distance) throws Exception {
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Polygon polygon = getBufferAroundPoint(lon, lat, distance);
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return polygon.toText();
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}
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/**
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* 将Polygon对象转换为WKT字符串格式
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*
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* @param polygon 多边形对象
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* @return WKT格式的多边形字符串，格式：POLYGON((lon1 lat1, lon2 lat2, ...))
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*/
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public static String polygonToString(Polygon polygon) {
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return polygon.toText();
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}
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}
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