133 lines
4.7 KiB
TypeScript
133 lines
4.7 KiB
TypeScript
import { generateUUID } from '../src/tool';
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/**
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* 使用turf工具进行切割面
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* @param line 线段数据
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* @param outerPolygon 面数据
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* return 返回切割的面数据
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*/
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export function splitPolygonByLine(line, outerPolygon) {
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console.log("************** 分割开始 start **************")
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console.log("第1步：传入的分割线数据",line);
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console.log("第2步：传入的分割面数据",outerPolygon)
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// 处理被分割的面数据坐标小数点保留多少位
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let truncatedSplitter = turf.truncate(turf.lineString(outerPolygon.geometry.coordinates[0]), {
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precision: 7,
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});
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console.log("第3步：分割面转换为线数据",truncatedSplitter);
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//求交点
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let intersectCollection = turf.lineIntersect(line, truncatedSplitter);
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console.log("第4步：与分割面的交点",intersectCollection);
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// printLngLat(intersectCollection.geometry.coordinates);
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// 交点小于2个 返回null
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if (intersectCollection.features.length < 2) {
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return null;
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}
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//将点合并成MultiPoint
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let intersectCombined = turf.combine(intersectCollection).features[0];
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console.log("第5步：分割后所有点数据",intersectCombined)
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//分别获取切割线
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let outerPieceCollection = turf.lineSplit(line, intersectCombined);
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let splitterPieceCollection = turf.lineSplit(truncatedSplitter, intersectCombined);
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console.log("第6步：切割线被分割后所有线段",outerPieceCollection);
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console.log("第7步：切割面被分割后所有线段",splitterPieceCollection);
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//将所有的线段放到一起
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let pieceCollection = turf.featureCollection(
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outerPieceCollection.features.concat(splitterPieceCollection.features),
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);
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console.log("第8步：所有分割线段",pieceCollection);
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//使用turf将闭合线组成多边形
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let polygonCollection = turf.polygonize(pieceCollection);
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console.log("第9步：分割线合并面数据",polygonCollection)
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//对多边形进行判断，切割外的多边形丢弃
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let innerPolygons = polygonCollection.features.filter((polygon) => {
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// 获取多边形质心 多边形不规则时有问题
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// let newcenter = turf.centroid(polygon);
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let randomCenterPoint = getRandomPointInPolygon(polygon);
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// 获取多边形表面一点
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let newcenter = turf.pointOnFeature(polygon);
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// 图斑中心点
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let centerPoint = turf.point(randomCenterPoint.geometry.coordinates);
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console.log('第10步：封闭图形中心点数据',randomCenterPoint,centerPoint)
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return turf.booleanWithin(centerPoint, outerPolygon);
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});
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console.log("第11步：返回最终处理后的数据",innerPolygons)
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// let innerPolygons = polygonCollection.features;
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//处理镂空数据（多处镂空数据会导致计算错误，因为polygonize方法无法正常的返回数据）
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if (outerPolygon.geometry.coordinates?.length > 1) {
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//获取镂空的面数据
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let holeCollection = turf.featureCollection(
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outerPolygon.geometry.coordinates.slice(1).map((item) => turf.polygon([item])),
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);
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//剔除掉镂空的部分数据
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innerPolygons = innerPolygons.map((polygon) => {
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let diff = polygon;
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turf.featureEach(holeCollection, (hole) => {
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diff = turf.difference(diff, hole);
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});
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return diff;
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});
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}
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// 每个图斑配置UUID
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innerPolygons.forEach((item, index) => {
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innerPolygons[index].properties.id = generateUUID();
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});
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console.log("************** 分割结束 end **************")
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return innerPolygons;
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}
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function getRandomPointInPolygon(polygon) {
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const bbox = turf.bbox(polygon); // 获取多边形的边界框
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let point;
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do {
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point = turf.randomPoint(1, {bbox: bbox}).features[0]; // 从边界框中生成一个随机点
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} while (!turf.booleanWithin(point, polygon)); // 检查点是否在多边形内部
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// 直到找到在内部的点再返回数据
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return point;
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}
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// 单个面数据分割
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export function splitPolygonByFill(drawPolygon, outerPolygon) {
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console.log("drawPolygon",drawPolygon);
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console.log("outerPolygon",outerPolygon)
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var polygon1 = turf.polygon(drawPolygon.geometry.coordinates)
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var polygon2 = turf.polygon(outerPolygon.geometry.coordinates);
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var difference = turf.difference(polygon2,polygon1);
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var intersection = turf.intersect(polygon2, polygon1);
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intersection.properties.id = generateUUID();
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difference.properties.id = generateUUID();
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let splitAfterFeatures = [intersection,difference];
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// splitAfterFeatures?.forEach((item,index)=>{
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// splitAfterFeatures[index].properties?.id = generateUUID();
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// })
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return splitAfterFeatures;
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}
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export function printLngLat(arr){
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arr.forEach((item,index)=>{
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console.log(item[1]+","+item[0]+"\n");
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})
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} |