Created
December 4, 2011 02:07
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A Conway's Game of Life implementation
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| class Grid | |
| # dynamic, auto-adjusting grid size | |
| class << self | |
| attr_accessor :min_x, :max_x, :min_y, :max_y | |
| end | |
| attr_accessor :hash | |
| def initialize | |
| self.hash = {} | |
| end | |
| def add_cell(x, y) | |
| Grid.min_x = x if Grid.min_x.nil? || x < Grid.min_x | |
| Grid.max_x = x if Grid.max_x.nil? || x > Grid.max_x | |
| Grid.min_y = y if Grid.min_y.nil? || y < Grid.min_y | |
| Grid.max_y = y if Grid.max_y.nil? || y > Grid.max_y | |
| self.hash[hash_x_y(x,y)] = true | |
| end | |
| def x_y str | |
| str.split('x').map { |v| v.to_i } | |
| end | |
| def hash_x_y x, y | |
| "#{x}x#{y}" | |
| end | |
| def next_grid | |
| grid = Grid.new | |
| self.hash.each_key do |k| | |
| x, y = x_y k | |
| if neighbors(x, y) == 2 || neighbors(x, y) == 3 | |
| grid.add_cell(x, y) | |
| end | |
| ((x-1)..(x+1)).each do |xx| | |
| ((y-1)..(y+1)).each do |yy| | |
| grid.add_cell(xx, yy) if self.hash[hash_x_y(xx, yy)].nil? && neighbors(xx, yy) == 3 | |
| end | |
| end | |
| end | |
| grid | |
| end | |
| def neighbors(x, y) | |
| counter = 0 | |
| ((x-1)..(x+1)).each do |xx| | |
| ((y-1)..(y+1)).each do |yy| | |
| counter +=1 unless (x == xx && y == yy) || self.hash[hash_x_y(xx, yy)].nil? | |
| end | |
| end | |
| counter | |
| end | |
| def prt | |
| ((Grid.min_x)..(Grid.max_x)).each do |x| | |
| s = '' | |
| ((Grid.min_y)..(Grid.max_y)).each do |y| | |
| s += self.hash[hash_x_y(x, y)] ? 'X' : ' ' | |
| end | |
| puts '|' + s + '|' | |
| end | |
| puts '-' * (Grid.max_x - Grid.min_x + 2) | |
| end | |
| end | |
| grid = Grid.new | |
| # blinker | |
| # grid.add_cell(0,1) | |
| # grid.add_cell(1,1) | |
| # grid.add_cell(2,1) | |
| # toad | |
| # grid.add_cell(1,2) | |
| # grid.add_cell(1,3) | |
| # grid.add_cell(1,4) | |
| # grid.add_cell(2,1) | |
| # grid.add_cell(2,2) | |
| # grid.add_cell(2,3) | |
| # glider | |
| grid.add_cell(0, 0) | |
| grid.add_cell(1, 1) | |
| grid.add_cell(1, 2) | |
| grid.add_cell(2, 0) | |
| grid.add_cell(2, 1) | |
| count = 0 | |
| while count < 100 | |
| grid.prt | |
| count += 1 | |
| grid = grid.next_grid | |
| sleep 1 | |
| end |
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