package com.lf.server.helper;
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import com.lf.server.entity.ctrl.CoordinateEntity;
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import org.locationtech.jts.geom.*;
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import org.locationtech.jts.triangulate.ConformingDelaunayTriangulationBuilder;
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import java.util.List;
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/**
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* JTS帮助类
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*
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* @author WWW
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* @date 2024-02-28
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*/
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public class JtsHelper {
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/**
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* 根据坐标点计算面积
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*/
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public static double calcAreaByPoints(List<CoordinateEntity> ces) {
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Coordinate[] cs = new Coordinate[ces.size()];
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for (int i = 0, c = ces.size(); i < c; i++) {
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cs[i] = new Coordinate(ces.get(i).getX(), ces.get(i).getY());
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}
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GeometryFactory gf = new GeometryFactory();
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MultiPoint mp = gf.createMultiPointFromCoords(cs);
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ConformingDelaunayTriangulationBuilder builder = new ConformingDelaunayTriangulationBuilder();
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builder.setSites(mp);
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// 实际为GeometryCollection（组成的geometry紧密相连）
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Geometry ts = builder.getTriangles(gf);
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// 以0的距离进行缓冲（因为各多边形两两共边），此时则将点云构造成了多边形
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Geometry union = ts.buffer(0);
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// String text = union.toText()
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double area = union.getArea();
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return Math.round(area * 100.0) / 100.0;
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}
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}
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