Method _initOverlayLayer

src/common/mapping/WebMapV2.js:572–634

(layerInfo, features = [], mergeByField, featureProjection)

    }

    _initOverlayLayer(layerInfo, features = [], mergeByField, featureProjection) {
      const { layerID, layerType, visible, style, featureType, projection } = layerInfo;
      layerInfo.visible = visible ? 'visible' : 'none';
      features = mergeFeatures({ sourceId: layerID, features, mergeByField, map: this.map });
      if (layerType === 'restMap') {
        this._createRestMapLayer(features, layerInfo);
        return;
      }
      if (layerType === 'mvt') {
        this._createMvtLayer(features.info, layerInfo, features.featureType);
        return;
      }

      // mbgl 目前不能处理 geojson 复杂面情况
      // mbgl isssue https://github.com/mapbox/mapbox-gl-js/issues/7023
      if (features && features[0] && features[0].geometry && features[0].geometry.type === 'Polygon') {
        features = this._handleMultyPolygon(features);
      }
      const realProjection = featureProjection || projection;
      if (
        features &&
        realProjection &&
        realProjection !== 'EPSG:4326' &&
        layerInfo.dataSource &&
        layerInfo.dataSource.type !== 'REST_DATA'
      ) {
        this._unprojectProjection = toEpsgCode(projection);
        features = this.transformFeatures(features);
      }

      features = this.handleLayerFeatures(features, layerInfo);

      if (layerType === 'VECTOR') {
        const styleGroups = this.getVectorStyleGroup(layerInfo);
        this._initLegendConfigInfo(layerInfo, styleGroups);
        if (featureType === 'POINT') {
          if (style.type === 'SYMBOL_POINT') {
            this._createSymbolLayer(layerInfo, features);
          } else {
            this._createGraphicLayer(layerInfo, features);
          }
        } else {
          // 线和面
          this._createVectorLayer(layerInfo, features);
          // 不在 _createVectorLayer 里面处理 layerAdded++ 的原因：_createDataflowLayer 也调用了_createVectorLayer ，会导致layerAdded > expectLayerLen
          this._addLayerSucceeded({ layerInfo, features });
        }
      } else if (layerType === 'UNIQUE') {
        this._createUniqueLayer(layerInfo, features);
      } else if (layerType === 'RANGE') {
        this._createRangeLayer(layerInfo, features);
      } else if (layerType === 'HEAT') {
        this._createHeatLayer(layerInfo, features);
      } else if (layerType === 'MARKER') {
        this._createMarkerLayer(layerInfo, features);
      } else if (layerType === 'MIGRATION') {
        this._createMigrationLayer(layerInfo, features);
      } else if (layerType === 'RANK_SYMBOL') {