Function ugGeometry2Geojson

src/common/wasm/util.js:79–172

(pUGGeo)

 * // => {"type":"Polygon","coordinates":[[[0,0],[1,0],[1,1],[0,1],[0,0]]]}
 */
export function ugGeometry2Geojson(pUGGeo) {
  //   if (!pUGGeo) {
  //     throw new Error("No UGC geometry pointer provided");
  //   }
  if (!pUGGeo) {
    return null;
  }
  const geomType = window.ugcModule._UGCWasm_Geometry_GetType(pUGGeo);
  switch (geomType) {
    case 1: {
      // UGGeoPoint
      const point2d = [];
      var x = window.ugcModule._UGCWasm_GeoPoint_GetX(pUGGeo);
      var y = window.ugcModule._UGCWasm_GeoPoint_GetY(pUGGeo);
      point2d.push(x, y)

      // create geojson point
      const pointJson = {
        type: "Point",
        coordinates: point2d
      };

      return pointJson
    }
    case 3: {
      // UGGeoLine
      const outlines = [];
      // get part count
      const partCount = window.ugcModule._UGCWasm_GeoLine_GetPartCount(pUGGeo);
      for (let j = 0; j < partCount; j++) {
        // get part j point count
        var count = window.ugcModule._UGCWasm_GeoLine_GetPartPointCount(pUGGeo, j);
        // 一个double是8个字节，而一个point2D是两个double，所以需要申请 点个数 * 2 * 8
        const pBuffer = window.ugcModule._malloc(count * 2 * 8);

        // get part j points
        window.ugcModule._UGCWasm_GeoLine_GetPart2(pUGGeo, pBuffer, j);

        // Float64Array to line part coordinates
        const view = new Float64Array(window.ugcModule.HEAPF64.buffer, pBuffer, count * 2);
        const coords = [];
        for (let i = 0; i < count * 2; i = i + 2) {
          coords.push([view[i], view[i + 1]]);
        }
        window.ugcModule._free(pBuffer);

        outlines.push(coords);
      }

      // create geojson linestring
      const linestringJson = {
        type: "LineString",
        coordinates: outlines[0]
      };

      return linestringJson
    }
    case 5: {