Method _calculateExtent

src/map-tile.js:275–316

()

    }
  }
  _calculateExtent() {
    const mapEl = this.getMapEl();

    if (!mapEl || !mapEl._map) {
      // Can't calculate extent without a map
      return;
    }

    const map = mapEl._map;
    const projection = map.options.projection;
    const tileSize = M[projection].options.crs.tile.bounds.max.x;

    // Convert tile coordinates to pixel bounds
    const pixelX = this.col * tileSize;
    const pixelY = this.row * tileSize;
    const pixelBounds = Lbounds(
      Lpoint(pixelX, pixelY),
      Lpoint(pixelX + tileSize, pixelY + tileSize)
    );

    // Convert pixel bounds to PCRS bounds
    const pcrsBounds = Util.pixelToPCRSBounds(
      pixelBounds,
      this.zoom,
      projection
    );

    // Format the extent similar to feature extents
    this._extent = Util._convertAndFormatPCRS(
      pcrsBounds,
      map.options.crs,
      projection
    );

    // Add zoom information
    this._extent.zoom = {
      minZoom: this.zoom,
      maxZoom: this.zoom,
      minNativeZoom: this.zoom,
      maxNativeZoom: this.zoom
    };
  }
}