RubyGrid

Grid Class for Games or whatever else you can think of. By Randy Carnahan, released to the Public Domain. Lua Version: http://github.com/syntruth/Lua-Grid

gem install RubyGrid

• The Grid object is data agnostic. It doesn't care what kind of data you store in a cell. This is meant to be, for abstraction's sake. You could even store functions.
• The class defines -no- display methods. Either sub-class the Grid class to add your own, or define functions that call the #get_* methods.
• Grid coordinates are always x,y number pairs. X is the vertical, starting at the top left, and Y is the horizontal, also starting at the top left. Hence, the top-left cell is always 0,0. One cell to the right is 0,1. One cell down is 1,0.
• Some Grid constants (OUTSIDE, NOT_VALID, NIL_VALUE) are not numbers, but strings, just in case number data is to be stored in a cell.

require 'grid'
g = RubyGrid.create(8, 8, ' ')
c = [[4, 4, 'O'], [4, 5, 'X'], [5, 4, 'X'], [5, 5, 'O']]
g.populate(c)
g.traverse(0, 0, RubyGrid::BOTTOM_RIGHT) do |x, y, value|
  puts "#{x}, #{y}: #{value}"
end
g.resize(4, 4)
g.get_cell(3, 3)