Class TilerAbstract

constructor

• new Tiler(url: string): Tiler

  Creates a new Tiler. Can only be called by subclasses as Tiler is abstract.

  Parameters

  • url: string

    the URL of the tile server. Use the characters x, y and z in braces for placeholders for the x,y,z parameters.

  Returns Tiler

dataTiles

sphMerc

tile

url

getCurrentTiles

• getCurrentTiles(): DataTile[]

  Obtain the current tiles surrounding the last-requested position.

  Returns DataTile[]

  array of 9 tiles, including the current tile and the 8 surrounding it.

getData

• getData(sphMercPos: EastNorth, z?: number): Promise<Tile>

  For a given Spherical Mercator position and zoom, downloads data if necessary and returns the data at the tile corresponding to that position.

  Parameters

  • sphMercPos: EastNorth

    the Spherical Mercator position.

  • z: number = 13

    zoom level to use (default 13)

  Returns Promise<Tile>

  Promise resolving with the given Tile.

getTile

• getTile(sphMercPos: EastNorth, z: number): Tile

  Obtain the Tile containing a given Spherical Mercator position.

  Parameters

  • sphMercPos: EastNorth
  • z: number

  Returns Tile

  the Tile containing the position.

lonLatToSphMerc

• lonLatToSphMerc(lonLat: LonLat): EastNorth

  Convert longitude/latitude to Spherical Mercator coordinates.

  Parameters

  • lonLat: LonLat

    the LonLat to convert.

  Returns EastNorth

  the EastNorth (Spherical Mercator coordinates).

rawTileToStoredTile

• rawTileToStoredTile(tile: Tile, data: any): DataTile

  Converts the raw data from the server to a custom type of data. By default, returns a DataTile object containing the Tile and the raw data returned from readTile(), but this can be overridden (e.g. in DemTile the data of the DataTile is a DEM object).

  Parameters

  • tile: Tile

    the current tile.

  • data: any

    the raw downloaded data.

  Returns DataTile

  the DataTile pairing the Tile and the data in the format we want.

AbstractreadTile

• readTile(url: string): Promise<any>

  Abstract method to read the data from a URL. The placeholders will be replaced with the current actual values.

  Parameters

  • url: string

    the URL.

  Returns Promise<any>

  a Promise resolving with arbitrary data.

setZoom

• setZoom(z: number): void

  Sets the zoom.

  Parameters

  • z: number

    the zoom to use.

  Returns void

update

• update(pos: EastNorth): Promise<DataTile[]>

  Download new tiles for a given Spherical Mercator position.

  Parameters

  • pos: EastNorth

    the Spherical Mercator position.

  Returns Promise<DataTile[]>

  a Promise resolving with an array of the newly-downloaded data tiles (only new tiles; existing ones are not returned)

updateByLonLat

• updateByLonLat(lonLat: LonLat): Promise<DataTile[]>

  Download new tiles for a given longitude/latitude.

  Parameters

  • lonLat: LonLat

    the position.

  Returns Promise<DataTile[]>

  a Promise resolving with an array of the newly-downloaded data tiles (only new tiles; existing ones are not returned)