Created
February 21, 2012 03:01
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Conway's Game of Life
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require 'pry' | |
require 'pp' | |
# -------------------------------------------------------------- | |
# CONWAY'S GAME OF LIFE! | |
# | |
# Any live cell with fewer than two live neighbours dies, as if caused by under-population. | |
# Any live cell with two or three live neighbours lives on to the next generation. | |
# Any live cell with more than three live neighbours dies, as if by overcrowding. | |
# Any dead cell with exactly three live neighbours becomes a live cell, as if by reproduction. | |
# -------------------------------------------------------------- | |
class Cell | |
attr_accessor :y, :x, :alive, :future_alive | |
def initialize(x,y,alive=false) | |
@x = x | |
@y = y | |
@alive = alive | |
end | |
def is_alive?(sum) | |
self.future_alive = if @alive | |
[2,3].include?(sum) | |
else | |
sum == 3 | |
end | |
end | |
def set_next_generation | |
self.alive = self.future_alive | |
self.future_alive = nil | |
end | |
def to_s; @alive ? 'O' : "-" end | |
end | |
class Pattern | |
def initialize(origin_x, origin_y, pattern=nil) | |
@origin_x, @origin_y = origin_x, origin_y | |
@default_patterns = { | |
:acorn => [[-3,0],[-2,0],[-2,2],[0,1],[1,0],[2,0],[3,0]], | |
:glider => [[0,0],[0,1],[-1,2],[-1,0],[-2,0]], | |
:glider_gun => [[0,0],[-1,0],[-1,1],[-1,-1],[-2,2],[-2,-2],[-3,0], | |
[-4,3],[-5,3],[-4,-3],[-5,-3],[-6, 2],[-6,-2], | |
[-7,1],[-7,0],[-7,-1],[-16,0],[-17,0],[-16,1], | |
[-17,1],[3,3],[3,2],[3,1],[4,3],[4,2],[4,1],[5,4], | |
[5,0],[7,4],[7,5],[7,0],[7,-1],[17,2],[17,3],[18,2], | |
[18,3]] | |
} | |
@pattern = @default_patterns[pattern].nil? ? @default_patterns[:acorn] : @default_patterns[pattern] | |
end | |
def set_cells(cells) | |
@pattern.each do |(x,y)| | |
unless cells[@origin_x + x].nil? || cells[@origin_x + x][@origin_y + y].nil? | |
cells[@origin_y + y][@origin_x + x].alive = true; | |
end | |
end | |
end | |
end | |
class Game | |
def initialize(opts) | |
@pattern = opts.delete(:pattern) | |
@width = opts.delete(:width) || 100 | |
@height = opts.delete(:height) || 100 | |
@steps = opts.delete(:steps) | |
@cells = Array.new(@height) { |y| Array.new(@width) { |x| Cell.new(x,y) }} | |
@neighbors = [[-1, 0],[1, 0],[-1, 1],[0, 1],[1, 1],[-1, -1],[0, -1], [1, -1]] | |
end | |
def cells | |
@cells.reverse | |
end | |
def alive_cells | |
@cells.reverse.inject([]) {|m, row| row.each {|cell| m << cell if cell.alive }; m} | |
end | |
def debug_alive_cells | |
alive_cells.each do |cell| | |
puts "\n---------------------------------\n" | |
puts "Cell @ X:#{cell.x} Y:#{cell.y}\n" | |
puts "\t Alive Neighbor count: #{alive_neighbors(cell.x, cell.y)}" | |
puts "-----------------------------------\n" | |
end | |
alive_cells.map{|c| [c.x, c.y]} | |
end | |
def play | |
Pattern.new(@width / 2, @height / 2, @pattern ).set_cells(@cells) | |
(1..@steps).each_with_index do |i| | |
system('clear') | |
puts self.to_s | |
step | |
end | |
end | |
def step | |
@cells.reverse.each do |row| | |
row.each do |cell| | |
cell.is_alive? alive_neighbors(cell.x, cell.y) | |
end | |
end | |
@cells.each {|r| r.each {|c| c.set_next_generation }} | |
end | |
def alive_neighbors(x,y) | |
@neighbors.inject(0) do |sum, (neighbor_x, neighbor_y)| | |
if !@cells[y + neighbor_y].nil? && !@cells[y + neighbor_y][x + neighbor_x].nil? && @cells[y + neighbor_y][x + neighbor_x].alive | |
sum += 1 | |
end | |
sum | |
end | |
end | |
def to_s | |
@cells.reverse.map { |row| row.join }.join("\n") | |
end | |
end | |
if __FILE__ == $0 | |
puts Game.new(:width => 100, :height => 100, :steps => 1000, :pattern => :glider_gun).play | |
end |
Wasn't properly checking all rules. Fixed that, and added the glider_gun pattern. Enjoy!
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It's still a work in progress. Added support for patterns.