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







map::slippy - Common code for slippy based map packages








package require Tcl 8.4


package require Tk 8.4


package require map::slippy ?0.3?


::map::slippy length level


::map::slippy tiles level


::map::slippy tile size


::map::slippy tile valid tile levels
    ?msgvar?


::map::slippy geo 2tile geo


::map::slippy geo 2point geo


::map::slippy tile 2geo tile


::map::slippy tile 2point tile


::map::slippy point 2geo point


::map::slippy point 2tile point












This package provides a number of methods doing things needed by
    all types of slippy-based map packages.









  
::map::slippy length level

  
This method returns the width/height of a slippy-based map at the
      specified zoom level, in pixels. This is, in essence, the result of
    
	expr { [tiles $level] * [tile size] }
    

  

  
::map::slippy tiles level

  
This method returns the width/height of a slippy-based map at the
      specified zoom level, in tiles.

  
::map::slippy tile size

  
This method returns the width/height of a tile in a slippy-based map, in
      pixels.

  
::map::slippy tile valid tile levels
    ?msgvar?

  
This method checks whether tile described a valid tile in a
      slippy-based map containing that many zoom levels. The result is a
      boolean value, true if the tile is valid, and false
      otherwise. For the latter a message is left in the variable named by
      msgvar, should it be specified.
    
A tile identifier as stored in tile is a list
        containing zoom level, tile row, and tile column, in this order. The
        command essentially checks this, i.e. the syntax, that the zoom level is
        between 0 and "levels-1", and that the row/col
        information is within the boundaries for the zoom level, i.e. 0 ...
        "[tiles $zoom]-1".

  

  
::map::slippy geo 2tile geo

  
Converts a geographical location at a zoom level (geo, a list
      containing zoom level, latitude, and longitude, in this order) to a tile
      identifier (list containing zoom level, row, and column) at that
    level.

  
::map::slippy geo 2point geo

  
Converts a geographical location at a zoom level (geo, a list
      containing zoom level, latitude, and longitude, in this order) to a pixel
      position (list containing zoom level, y, and x) at that level.

  
::map::slippy tile 2geo tile

  
Converts a tile identifier at a zoom level (tile, list containing
      zoom level, row, and column) to a geographical location (list containing
      zoom level, latitude, and longitude, in this order) at that level.

  
::map::slippy tile 2point tile

  
Converts a tile identifier at a zoom level (tile, a list containing
      zoom level, row, and column, in this order) to a pixel position (list
      containing zoom level, y, and x) at that level.

  
::map::slippy point 2geo point

  
Converts a pixel position at a zoom level (point, list containing
      zoom level, y, and x) to a geographical location (list containing zoom
      level, latitude, and longitude, in this order) at that level.

  
::map::slippy point 2tile point

  
Converts a pixel position at a zoom level (point, a list containing
      zoom level, y, and x, in this order) to a tile identifier (list containing
      zoom level, row, and column) at that level.











  
[1]

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










geodesy, geography, latitute, location, longitude, map, slippy,
    zoom







  

    0.3
    map