package org.sxkj.common.geo.utils;
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import org.locationtech.jts.geom.Geometry;
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import org.locationtech.jts.geom.LinearRing;
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import org.locationtech.jts.geom.MultiPolygon;
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import org.locationtech.jts.geom.Polygon;
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import org.locationtech.jts.io.WKTReader;
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import org.locationtech.jts.operation.valid.IsValidOp;
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public class GeometryCheck {
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// 新增 polygonCheck 方法，返回 boolean 值表示几何体是否正常
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public static boolean polygonCheck(String polygonData) {
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try {
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WKTReader reader = new WKTReader();
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Geometry geometry = reader.read(polygonData); // 解析 WKT 数据
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// 检查是否是 Polygon 或 MultiPolygon
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if (geometry instanceof Polygon) {
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Polygon polygon = (Polygon) geometry;
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return checkPolygon(polygon);
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} else if (geometry instanceof MultiPolygon) {
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MultiPolygon multiPolygon = (MultiPolygon) geometry;
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boolean allValid = true;
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for (int i = 0; i < multiPolygon.getNumGeometries(); i++) {
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Polygon polygon = (Polygon) multiPolygon.getGeometryN(i);
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if (!checkPolygon(polygon)) {
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allValid = false; // 只要有一个多边形不正常，返回 false
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break;
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}
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}
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return allValid;
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} else {
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return false; // 如果几何类型不匹配，返回 false
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}
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} catch (Exception e) {
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e.printStackTrace();
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return false; // 解析异常时返回 false
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}
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}
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// 检查 Polygon 是否完整且无异常，返回 boolean 表示是否正常
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private static boolean checkPolygon(Polygon polygon) {
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// 检查外环是否闭合
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boolean outerRingClosed = isRingClosed(polygon.getExteriorRing());
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// 检查每个内环（孔）是否闭合
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boolean innerRingsClosed = true;
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for (int i = 0; i < polygon.getNumInteriorRing(); i++) {
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if (!isRingClosed(polygon.getInteriorRingN(i))) {
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innerRingsClosed = false;
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break;
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}
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}
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// 使用 IsValidOp 检查几何体是否有效（例如，是否有自相交等问题）
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IsValidOp isValidOp = new IsValidOp(polygon);
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boolean isValid = isValidOp.isValid();
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// 返回该 Polygon 是否正常，即闭合且无自相交等问题
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return isValid && outerRingClosed && innerRingsClosed;
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}
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// 检查 LinearRing 是否闭合（首尾点是否相同）
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private static boolean isRingClosed(LinearRing ring) {
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return ring.isClosed();
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}
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}
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