ferencd@0: #---
ferencd@0: # Excerpted from "Mazes for Programmers",
ferencd@0: # published by The Pragmatic Bookshelf.
ferencd@0: # Copyrights apply to this code. It may not be used to create training material, 
ferencd@0: # courses, books, articles, and the like. Contact us if you are in doubt.
ferencd@0: # We make no guarantees that this code is fit for any purpose. 
ferencd@0: # Visit http://www.pragmaticprogrammer.com/titles/jbmaze for more book information.
ferencd@0: #---
ferencd@0: require 'grid'
ferencd@0: 
ferencd@0: class DistanceGrid < Grid
ferencd@0:   attr_accessor :distances
ferencd@0: 
ferencd@0:   def contents_of(cell)
ferencd@0:     if distances && distances[cell]
ferencd@0:       distances[cell].to_s
ferencd@0:     else
ferencd@0:       super
ferencd@0:     end
ferencd@0:   end
ferencd@0: end