Method createBaseLayer

src/openlayers/mapping/WebMap.js:969–1074

* @private * @function WebMap.prototype.createBaseLayer * @description 创建矢量图层，包括底图及其叠加的矢量图层 * @param {Object} layerInfo - 关于地图的信息 * @param {number} index - 当前图层在地图中的index * @param {boolean} isCallBack - 是否调用回调函数 * @param {scope} {Object} this对象

(layerInfo, index, isCallBack, scope, isBaseLayer)

   * @param {scope} {Object} this对象
   */
  createBaseLayer(layerInfo, index, isCallBack, scope, isBaseLayer) {
    let source,
      that = this;

    if (scope) {
      // 解决异步回调
      that = scope;
    }
    let layerType = layerInfo.layerType; //底图和rest地图兼容
    if (
      layerType.indexOf('TIANDITU_VEC') > -1 ||
      layerType.indexOf('TIANDITU_IMG') > -1 ||
      layerType.indexOf('TIANDITU_TER') > -1
    ) {
      layerType = layerType.substr(0, 12);
    }
    switch (layerType) {
      case 'TIANDITU_VEC':
      case 'TIANDITU_IMG':
      case 'TIANDITU_TER':
        source = this.createTiandituSource(layerType, layerInfo.projection);
        break;
      case 'BAIDU':
        source = this.createBaiduSource();
        break;
      case 'BING':
        source = this.createBingSource();
        break;
      case 'WMS':
        source = this.createWMSSource(layerInfo);
        break;
      case 'WMTS':
        source = that.createWMTSSource(layerInfo);
        break;
      case 'TILE':
      case 'SUPERMAP_REST':
        source = that.createDynamicTiledSource(layerInfo, isBaseLayer);
        break;
      case 'ZXY_TILE':
        source = this.createXYZTileSource(layerInfo);
        break;
      case 'CLOUD':
      case 'CLOUD_BLACK':
      case 'OSM':
      case 'JAPAN_ORT':
      case 'JAPAN_RELIEF':
      case 'JAPAN_PALE':
      case 'JAPAN_STD':
      case 'GOOGLE_CN':
      case 'GOOGLE':
        source = this.createXYZSource(layerInfo);
        break;
      default:
        break;
    }
    var layer = new olLayer.Tile({
      source: source,
      zIndex: layerInfo.zIndex || 1,