-
Notifications
You must be signed in to change notification settings - Fork 0
/
game_of_life.rb
149 lines (123 loc) · 3.21 KB
/
game_of_life.rb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
# Basic file
class Game
attr_accessor :world, :seeds
def initialize(world = World.new, seeds = [])
@world = world
@seeds = seeds
seeds.each do |seed|
world.cell_grid[seed[0]][seed[1]].alive = true
end
end
def tick!
next_round_live_cells = []
next_round_dead_cells = []
world.cells.each do |cell|
neighbours = world.live_neighbours_around_cell(cell).count
# Rule 1
if cell.alive? && neighbours < 2
next_round_dead_cells << cell
end
# Rule 2
if cell.alive? && [2, 3].include?(neighbours)
next_round_live_cells << cell
end
# Rule 3
if cell.alive? && neighbours > 3
next_round_dead_cells << cell
end
# Rule 4
if cell.dead? && neighbours == 3
next_round_live_cells << cell
end
end
next_round_live_cells.each(&:revive!)
next_round_dead_cells.each(&:die!)
end
end
class World
attr_accessor :rows, :cols, :cell_grid, :cells
def initialize(rows = 3, cols = 3)
@rows = rows
@cols = cols
@cells = []
@cell_grid = Array.new(rows) do |row|
Array.new(cols) do |col|
cell = Cell.new(col, row)
cells << cell
cell
end
end
end
def live_neighbours_around_cell(cell)
live_neighbours = []
# it detects a neighbour to the north east
if cell.y > 0 && cell.x < (cols - 1)
candidate = cell_grid[cell.y - 1][cell.x + 1]
live_neighbours << candidate if candidate.alive?
end
# it detects a neighbour to the south east
if cell.y < (rows - 1) && cell.x < (cols - 1)
candidate = @cell_grid[cell.y + 1][cell.x + 1]
live_neighbours << candidate if candidate.alive?
end
# it detects a neighbour to the south west
if cell.y < (rows - 1) && cell.x > 0
candidate = @cell_grid[cell.y + 1][cell.x - 1]
live_neighbours << candidate if candidate.alive?
end
# it detects a neighbour to the north west
if cell.y > 0 && cell.x > 0
candidate = @cell_grid[cell.y - 1][cell.x - 1]
live_neighbours << candidate if candidate.alive?
end
# it detects a neighbour to the north
if cell.y > 0
candidate = @cell_grid[cell.y - 1][cell.x]
live_neighbours << candidate if candidate.alive?
end
# it detects a neighbour to the east
if cell.x < (cols - 1)
candidate = @cell_grid[cell.y][cell.x + 1]
live_neighbours << candidate if candidate.alive?
end
# it detects a neighbour to the south
if cell.y < (rows - 1)
candidate = @cell_grid[cell.y + 1][cell.x]
live_neighbours << candidate if candidate.alive?
end
# it detects a neighbour to the west
if cell.x > 0
candidate = @cell_grid[cell.y][cell.x - 1]
live_neighbours << candidate if candidate.alive?
end
live_neighbours
end
def live_cells
cells.select(&:alive)
end
def randomly_populate
cells.each do |cell|
cell.alive = [true, false].sample
end
end
end
class Cell
attr_accessor :alive, :x, :y
def initialize(x = 0, y = 0)
@alive = false
@x = x
@y = y
end
def alive?
alive
end
def dead?
!alive
end
def revive!
@alive = true
end
def die!
@alive = false
end
end