supportsTile method
Returns true if MapDatabase contains the given tile.
@param tile tile to be rendered. @return true if tile is part of database.
Implementation
@override
Future<bool> supportsTile(Tile tile, Projection projection) async {
if (tile.zoomLevel < zoomLevelMin || tile.zoomLevel > zoomLevelMax)
return false;
await _lateOpen();
return tile
.getBoundingBox(projection)
.intersects(getMapFileInfo().boundingBox);
}