The ImageLoader is a delegate used by a tile to load the image.
A listener for tile state change events.
At tile represents a single space on the map within a specific ReferencedEnvelope.
A TileFactory is responsible for finding and/or creating tiles for a given TileService and area.
A TileIdentifier locates a tile in the grid space of a given tile server by giving its column,
row and zoom level.
A TileService represent the class of objects that serve map tiles.