Class: Life::Board

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(width, height) ⇒ Board

Returns a new instance of Board.



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

def initialize(width, height)
  if width < 3 || height < 3
    raise ArgumentError.new("Life Board dimensions must be bigger than 3")
  end

  @width = width
  @height = height
  @cells = Array.new(height) do
    Array.new(width) { false }
  end
end

Instance Attribute Details

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/life/board.rb', line 3

def height
  @height
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/life/board.rb', line 3

def width
  @width
end

Class Method Details

.from_array(cells) ⇒ Object 



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# File 'lib/life/board.rb', line 35

def self.from_array(cells)
  width = cells[0].size
  height = cells.size
  board = new(width, height)
  board.update_from_array(cells)
  board
end

.from_text(text) ⇒ Object 



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# File 'lib/life/board.rb', line 43

def self.from_text(text)
  lines = text.split("\n")

  width = lines[0].size
  height = lines.size
  board = Life::Board.new(width, height)

  lines.each_with_index do |line, y|
    line.each_char.with_index do |char, x|
      board[x, y] = (char == "#")
    end
  end

  board
end

Instance Method Details

#[](x, y) ⇒ Object 



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# File 'lib/life/board.rb', line 17

def [](x, y)
  wx, wy = wrapped_coords(x, y)
  @cells[wy][wx]
end

#[]=(x, y, value) ⇒ Object 



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# File 'lib/life/board.rb', line 22

def []=(x, y, value)
  wx, wy = wrapped_coords(x, y)
  @cells[wy][wx] = value
end

#clone ⇒ Object 



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# File 'lib/life/board.rb', line 69

def clone
  self.class.from_array(@cells)
end

#count_neighbors(x, y) ⇒ Object 



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# File 'lib/life/board.rb', line 59

def count_neighbors(x, y)
  count = 0

  each_neighbor(x, y) do |nx, ny, alive|
    count += 1 if alive
  end

  count
end

#each ⇒ Object 



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# File 'lib/life/board.rb', line 73

def each
  (0...height).each do |y|
    (0...width).each do |x|
      yield x, y, self[x, y]
    end
  end
end

#each_neighbor(x, y) ⇒ Object 



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# File 'lib/life/board.rb', line 81

def each_neighbor(x, y)
  (-1..1).each do |dy|
    (-1..1).each do |dx|
      next if dx == 0 && dy == 0

      nx = x + dx
      ny = y + dy
      yield nx, ny, self[nx, ny]
    end
  end
end

#tick ⇒ Object 



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# File 'lib/life/board.rb', line 93

def tick
  old_board = clone()
  each do |x, y, alive|
    neighbor_count = old_board.count_neighbors(x, y)

    if alive
      self[x, y] = (2..3).include?(neighbor_count)
    else
      self[x, y] = (neighbor_count == 3)
    end
  end
end

#to_a ⇒ Object 



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# File 'lib/life/board.rb', line 27

def to_a
  clone_2d_array(@cells)
end

#update_from_array(cells) ⇒ Object 



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# File 'lib/life/board.rb', line 31

def update_from_array(cells)
  @cells = clone_2d_array(cells)
end