Class: GameOfLife::Core

Inherits:
Object
  • Object
show all
Defined in:
lib/gameoflife/core.rb

Constant Summary collapse

LIVE = 
1
DEAD = 
nil

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(array) ⇒ Core

Returns a new instance of Core.



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# File 'lib/gameoflife/core.rb', line 6

def initialize array
  @world = {}
  array.each_with_index do |row, row_index|
    row.each_with_index do |e, col_index| 
      @world[[row_index, col_index]]  = e
    end
  end

  @world.reject!{|k, v|v.nil? || v == 0}
  @static_world = @world.clone
end

Instance Attribute Details

#world ⇒ Object (readonly)

Returns the value of attribute world.



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# File 'lib/gameoflife/core.rb', line 5

def world
  @world
end

Instance Method Details

#neighbor_count(x, y) ⇒ Object 



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# File 'lib/gameoflife/core.rb', line 18

def neighbor_count x, y
  count_map = {}
  (-1..1).each do |i|
    (-1..1).each do |j|
      count_map[[x+i,y+j]] = @static_world[[x+i,y+j]]
    end
  end
  count_map.reject! {|k, v| v.nil?}
  count_map.count - count_map[[x,y]].to_i
end

#next_state(x, y) ⇒ Object 



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# File 'lib/gameoflife/core.rb', line 47

def next_state x, y
  conditions = {
    1 => DEAD,
    2 => @static_world[[x,y]],
    3 => LIVE,
    4 => DEAD,
    5 => DEAD,
    6 => DEAD,
    7 => DEAD,
    8 => DEAD
  }[neighbor_count x, y]
end

#next_world ⇒ Object 



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# File 'lib/gameoflife/core.rb', line 29

def next_world
  visited_pos = {}
  @static_world.each do |k, v|
    x,y = k[0], k[1]
    (-1..1).each do |i|
      (-1..1).each do |j|
        if not visited_pos[[x+i,y+j]]
          @world[[x+i,y+j]] = next_state(x+i, y+j)
          visited_pos[[x+i,y+j]] = true
        end
      end
    end
  end

  @world.reject!{|k, v|v.nil?}
  @static_world = @world.clone
end