Method _getZXYTileMapBounds

src/openlayers/mapping/WebMap.js:1413–1427

(layerInfo)

    return options;
  }
  _getZXYTileMapBounds(layerInfo) {
    const { mapBounds, tileSize = 256, resolutions, origin } = layerInfo;
    if (mapBounds) {
      return mapBounds;
    }
    if (resolutions) {
      const maxResolution = resolutions.sort((a, b) => b - a)[0];
      const size = maxResolution * tileSize;
      return [origin[0], origin[1] - size, origin[0] + size, origin[1]];
    }
    // 兼容之前的3857全球剖分
    if (this.baseProjection == 'EPSG:3857') {
      return [-20037508.3427892, -20037508.3427892, 20037508.3427892, 20037508.3427892];
    }
  }
  /**
   * @private
   * @function WebMap.prototype.createXYZTileSource