Bad life

life.rb

require './drawer'

class Life
  def initialize(window_x: 640, window_y: 480)
    @window_x = window_x
    @window_y = window_y
    @cellsize = 8
    
    calcuate_bounds
    
    @cells = []
 
    if ARGV[0]
      load_seed(ARGV[0])
    else
      randomize_cells
    end

    @drawer = Drawer.new(self, max_x: window_x, max_y: window_y, cellsize: @cellsize)
    @drawer.show
  end
  
  def calcuate_bounds
    @cells_x = (@window_x/@cellsize).to_i-1
    @cells_y = (@window_y/@cellsize).to_i-1
  end

  def initialize_cells
    @cells_x.times do |x|
      @cells[x] = []
      @cells_y.times do |y|
        @cells[x] << 0
      end
    end
  end

  def load_seed(file_path)
    initialize_cells

    File.open(file_path) do |file|

      while (line = file.readline) && (!file.eof?)
        next if line.size < 3
        
        (x, y) = line.split(',')

        puts "line: #{line}   x: #{x}   y: #{y}"
        @cells[y.to_i][x.to_i] = 1
      end
    end

   # print_cells
  end

  def print_cells
    @cells.each do |cx|
      puts cx.map{|v|v==1 ? 'X' : '_'}.join
    end
  end
  
  def randomize_cells
    @cells_x.times do |x|
      @cells[x] = []
      @cells_y.times do |y|
        rand(10) > 8 ? @cells[x] << 1 : @cells[x] << 0
      end
    end
  end
  
  def get_neighbors(x,y)
    n=0
    [
      [x-1,y-1], [x,y-1], [x+1, y-1],
      [x-1,y],            [x+1, y],
      [x-1,y+1], [x,y+1], [x+1, y+1],
    ].each do |xx,yy|
      if @cells[xx] && @cells[xx][yy] && (xx >= 0) && (yy >= 0) && (yy <= @cells[xx].size) && (xx <= @cells.size)
        n+=1 if @cells[xx][yy]==1
      end
    end
    n
  end
  
  def update
    # return
    @cells.each_with_index do |cy, y|
      cy.each_with_index do |cx, x|
        neighbors = get_neighbors(x,y)
        if (neighbors < 2) || (neighbors > 3) && @cells[x][y]==1
          @cells[x][y]=0
        elsif neighbors == 3 && @cells[x][y]==0
          @cells[x][y]=1
        end
      end
    end
  end
  
  def draw
    @cells.each_with_index do |cy, y|
      cy.each_with_index do |cx, x|
        if cx == 1
          @drawer.draw_point(y,x)
        end
      end
    end
  end
    
end

Life.new