Created
December 5, 2011 16:51
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Conway's Game of Life in Ruby
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def neighbors(cell) | |
neighbors = [] | |
x = cell[0] | |
y = cell[1] | |
(x-1..x+1).each do |xx| | |
(y-1..y+1).each do |yy| | |
next if xx==x && yy==y | |
neighbors.push([xx,yy]) | |
end | |
end | |
neighbors | |
end | |
def step(this_gen) | |
next_gen = [] | |
dead_neighbors = [] | |
# all live cells | |
this_gen.each do |cell| | |
live_neighbors = [] | |
these_neighbors = neighbors(cell) | |
these_neighbors.each do |this_neighbor| | |
if (this_gen.include?(this_neighbor)) | |
live_neighbors.push(this_neighbor) | |
elsif (!dead_neighbors.include?(this_neighbor)) | |
dead_neighbors.push(this_neighbor) | |
end | |
end | |
next_gen.push(cell) if (live_neighbors.count >= 2 && live_neighbors.count <= 3) | |
end | |
# all dead neighbors | |
dead_neighbors.each do |cell| | |
live_neighbors = [] | |
these_neighbors = neighbors(cell) | |
these_neighbors.each do |this_neighbor| | |
live_neighbors.push(this_neighbor) if (this_gen.include?(this_neighbor)) | |
end | |
next_gen.push(cell) if (live_neighbors.count == 3) | |
end | |
next_gen | |
end | |
def display(board,size=40) | |
(1..size).each do |row| | |
str = "" | |
(1..size).each do |col| | |
if (board.include?([row,col])) | |
str += "O" | |
else | |
str += " " | |
end | |
end | |
puts str | |
end | |
end | |
def game_of_life(start_gen,generations) | |
this_gen = start_gen | |
while(generations>0) | |
display(this_gen) | |
next_gen = step(this_gen) | |
generations -= 1 | |
this_gen = next_gen | |
sleep 0.1 | |
end | |
end | |
start_gen = [[2,1],[3,2],[1,3],[2,3],[3,3]] | |
game_of_life(start_gen,150) |
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