import gcoord from "gcoord"; // 示例 WKT 数据,可以是 POLYGON 或 MULTIPOLYGON let wktData = "MULTIPOLYGON(((106.67591743605254 38.21012898330025,106.67588081160454 38.21003303839916,106.6755667227518 38.21006159193115,106.67551318487904 38.20994380861134,106.67578087424232 38.20991525507935,106.67573447475257 38.209776056610394,106.67594862624321 38.20973322631232,106.6759771797752 38.20983673286605,106.67621495734579 38.20981715370431,106.6761636759473 38.20962317624071,106.67538440246796 38.209765943901175,106.67538440246796 38.20984050880776,106.67519166939297 38.20987258822527,106.6752925390611 38.2102444053304,106.67591743605254 38.21012898330025)))"; // 从 WKT 字符串解析出坐标数组 function wktToCoordinates(wkt) { if (wkt.startsWith("POLYGON")) { // 处理 POLYGON 格式 return [wkt.match(/\(([^()]+)\)/)[1].trim().split(',').map(point => { return point.trim().split(' ').map(Number); })]; } else if (wkt.startsWith("MULTIPOLYGON")) { // 处理 MULTIPOLYGON 格式 let polygons = wkt.match(/\(\(\(([^()]+)\)\)\)/g); return polygons.map(polygon => { return polygon.match(/\(([^()]+)\)/)[1].trim().split(',').map(point => { return point.trim().split(' ').map(Number); }); }); } else { throw new Error("Unsupported WKT type"); } } // 将坐标数组转换为火星坐标系(GCJ-02) function convertToGCJ02(coordinates) { return coordinates.map(polygon => { return polygon.map(coord => { return gcoord.transform( coord, // 源坐标 gcoord.WGS84, // 源坐标系 gcoord.GCJ02 // 目标坐标系(火星坐标系) ); }); }); } // 将火星坐标系的坐标转换回 WKT 格式字符串 function coordinatesToWKT(coordinates, isMultiPolygon) { if (isMultiPolygon) { // MULTIPOLYGON 格式 let polygons = coordinates.map(polygon => { let coordString = polygon.map(coord => coord.join(' ')).join(', '); return `((${coordString}))`; }); return `MULTIPOLYGON (${polygons.join(', ')})`; } else { // POLYGON 格式 let coordString = coordinates[0].map(coord => coord.join(' ')).join(', '); return `POLYGON ((${coordString}))`; } } // 输入wkt 为84,返回wkt为火星坐标(高德) export function transform(wktData) { if (!wktData) return [] wktData = wktData.replace("SRID=4490;", '') // 判断 WKT 数据是 POLYGON 还是 MULTIPOLYGON let isMultiPolygon = wktData.startsWith("MULTIPOLYGON"); // WGS84 转 火星坐标 let coordinates = wktToCoordinates(wktData); let gcj02Coordinates = convertToGCJ02(coordinates); let gcj02Wkt = coordinatesToWKT(gcj02Coordinates, isMultiPolygon); return gcj02Wkt; }