Class: Conwaymp::Board

Inherits:
Object
  • Object
show all
Defined in:
lib/conwaymp/board.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts) ⇒ Board

Returns a new instance of Board.



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# File 'lib/conwaymp/board.rb', line 7

def initialize(opts)
  @opts = opts
  @sleep_time = 0.5 # Seconds

  # Initialize the board
  @grid = []

  # Initialize the stats
  @state = {
    tick: 0
  }

  generate_grid

  seed_file = @opts[:load] || @opts[:seed]

  seed_grid(seed_file, !@opts[:seed].nil?) if seed_file
end

Instance Attribute Details

#grid ⇒ Object (readonly)

Returns the value of attribute grid.



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# File 'lib/conwaymp/board.rb', line 5

def grid
  @grid
end

Instance Method Details

#clear_grid ⇒ Object 



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# File 'lib/conwaymp/board.rb', line 32

def clear_grid
  @grid.flatten.map(&:die!) # Kill all cells
end

#display ⇒ Object 



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# File 'lib/conwaymp/board.rb', line 107

def display
  print_board
  print_stats
end

#generate_grid ⇒ Object 



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# File 'lib/conwaymp/board.rb', line 26

def generate_grid
  @opts[:rows].times do
    @grid << Array.new(@opts[:cols]) { Cell.new }
  end
end

#neighbours_of(row, col) ⇒ Object 



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# File 'lib/conwaymp/board.rb', line 72

def neighbours_of(row, col)
  cell = @grid[row][col]

  neighbours = []

  possible_neighbours_of(row, col).each do |r, c|
    neighbours << @grid[r][c]
  end

  cell.living_neighbours = neighbours.select(&:alive?).count

  neighbours
end

#population ⇒ Object 



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# File 'lib/conwaymp/board.rb', line 86

def population
  @grid.flatten.select(&:alive?).count
end

#possible_neighbours_of(row, col) ⇒ Object

TODO: This method feels wrong. I’m sure there’s something here that can be done with permutations?



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# File 'lib/conwaymp/board.rb', line 54

def possible_neighbours_of(row, col)
  [
    [row - 1, col], # N
    [row, col + 1], # E
    [row + 1, col], # S
    [row, col - 1], # W
    [row + 1, col + 1], # SE
    [row - 1, col - 1], # NW
    [row + 1, col - 1], # SW
    [row - 1, col + 1], # NE
  ]
    .select do |r, c|
    # Ensure they're within bounds
    (0..@opts[:rows] - 1).cover?(r) &&
      (0..@opts[:cols] - 1).cover?(c)
  end
end

#print_board ⇒ Object 



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# File 'lib/conwaymp/board.rb', line 90

def print_board
  puts "\e[H\e[2J" # Clear the screen

  map = @grid.map do |row|
    row.map(&:print).join('')
  end.join("\n")

  puts map
end

#print_stats ⇒ Object

TODO: Tidy?



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# File 'lib/conwaymp/board.rb', line 101

def print_stats
  puts ' + ' * @opts[:cols]
  puts "Tick: #{@state[:tick]}\t Pop.: #{population}"
    .center(@opts[:cols] * 3)
end

#seed_grid(path, is_included) ⇒ Object 



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# File 'lib/conwaymp/board.rb', line 36

def seed_grid(path, is_included)
  clear_grid

  if is_included
    path = File.expand_path("../../../seeds/#{path}", __FILE__)
  end

  file = File.read(File.expand_path(path))

  file.split.each_with_index do |r, ri|
    r.split(',').each_with_index do |c, ci|
      @grid[ri][ci].rebirth! if c == '1'
    end
  end
end

#tick ⇒ Object 



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# File 'lib/conwaymp/board.rb', line 112

def tick
  @state[:tick] += 1

  (0..(@opts[:rows] - 1)).each do |row|
    (0..(@opts[:cols] - 1)).each do |col|
      neighbours_of(row, col)
    end
  end

  @grid = @grid.map do |row|
    row.map do |cell|
      cell.tick
      cell
    end
  end

  sleep @sleep_time
end