map::slippy::fetcher(n) Mapping utilities map::slippy::fetcher(n) 







map::slippy::fetcher - Accessing a server providing tiles for
    slippy-based maps








package require Tcl 8.4


package require Tk 8.4


package require img::png 


package require map::slippy 


package require map::slippy::fetcher ?0.2?


::map::slippy::fetcher fetcherName levels
    url


fetcherName levels


fetcherName tileheight


fetcherName tilewidth


fetcherName get tile donecmd












This package provides a class for accessing http servers providing
    tiles for slippy-based maps.









  
::map::slippy::fetcher fetcherName levels
    url

  
Creates the fetcher fetcherName and configures it with the number
      of zoom levels supported by the tile server, and the url it
      is listening on for tile requests.
    
The result of the command is fetcherName.

  









  

  
This method returns the number of zoom levels supported by the fetcher
      object, and the tile server it is accessing.

  

  
This method returns the height of tiles served, in pixels.

  

  
This method returns the width of tiles served, in pixels.

  

  
This is the main method of the fetcher, retrieving the image for the
      specified tile. The tile identifier is a list containing three
      elements, the zoom level, row, and column number of the tile, in this
      order.
    
The command refix donecmd will be invoked when the
        fetcher either knows the image for the tile or that no image will
        forthcoming. It will be invoked with either 2 or 3 arguments, i.e.

  







  
[1]

  
The string set, the tile, and the image.

  
[2]

  
The string unset, and the tile.






These two possibilities are used to either signal the image for
    the tile, or that the tile has no image defined for it.











  
[1]

  
http://wiki.openstreetmap.org/wiki/Main_Page










http, location, map, server, slippy, tile, url, zoom







  

    0.2
    map