Class: LifeGrid

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

Instance Method Summary collapse

Constructor Details

#initialize(window) ⇒ LifeGrid

Manages the underlying array of cells and their life process



71
72
73
74
75
76
 
# File 'lib/NanoLife.rb', line 71

def initialize(window)
  @num_cols = WIN_WIDTH / CELL_SIZE
  @num_rows = WIN_HEIGHT / CELL_SIZE
  @grid = create_grid
  @window = window
end

Instance Method Details

#check_neighbors(x, y) ⇒ Object

Given an x and y, calculate how many neighbors cell has



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
 
# File 'lib/NanoLife.rb', line 111

def check_neighbors(x, y)
  num_neighbors = 0

  # Previous row
  if y > 0 and x > 0
    num_neighbors += @grid[x-1][y-1]
  end
  if y > 0
    num_neighbors += @grid[x][y-1]
  end
  if x < @num_cols - 1 and y > 0
    num_neighbors += @grid[x+1][y-1]
  end

  # Current row
  if x > 0
    num_neighbors += @grid[x-1][y]
  end
  if x < @num_cols - 1
    num_neighbors += @grid[x+1][y]
  end

  # Lower row
  if x > 0 and y < @num_rows - 1
    num_neighbors += @grid[x-1][y+1]
  end
  if y < @num_rows - 1
    num_neighbors += @grid[x][y+1]
  end
  if x < @num_cols - 1 and y < @num_rows - 1
    num_neighbors += @grid[x+1][y+1]
  end

  return num_neighbors
end

#clear ⇒ Object

Utility function to randomize grid



184
185
186
187
188
189
190
 
# File 'lib/NanoLife.rb', line 184

def clear
  (0...@num_cols).each do |x|
    (0...@num_rows).each do |y|
      @grid[x][y] = 0
    end
  end
end

#create_grid ⇒ Object

Create an empty grid array



79
80
81
 
# File 'lib/NanoLife.rb', line 79

def create_grid
  return Array.new(@num_cols) {Array.new(@num_rows, 0)}
end

#draw ⇒ Object

Draw the cell grid to the window



148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
 
# File 'lib/NanoLife.rb', line 148

def draw
  # draw grid
  (0...@num_cols).each do |x|
    (0...@num_rows).each do |y|
      if @grid[x][y] == 0
        color = EMPTY_COLOR
      else
        color = CELL_COLOR
      end
      realx = x * CELL_SIZE
      realy = y * CELL_SIZE
      @window.draw_quad(
        realx, realy, color,
        realx + CELL_SIZE, realy, color,
        realx, realy + CELL_SIZE, color,
        realx + CELL_SIZE, realy + CELL_SIZE, color,
      )
    end
  end
end

#invert_cell(x, y) ⇒ Object

Flip the state of a cell. Useful for manual click manipulation



170
171
172
 
# File 'lib/NanoLife.rb', line 170

def invert_cell(x, y)
  @grid[x][y] = (@grid[x][y] == 0 ? 1 : 0)
end

#randomize ⇒ Object

Utility function to randomize grid



175
176
177
178
179
180
181
 
# File 'lib/NanoLife.rb', line 175

def randomize
  (0...@num_cols).each do |x|
    (0...@num_rows).each do |y|
      @grid[x][y] = rand(2)
    end
  end
end

#update ⇒ Object

Ipdate state of all cells based on Conway’s Game of Life rules



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
 
# File 'lib/NanoLife.rb', line 84

def update
  # For all cells check neighbors and kill or birth
  tmp_grid = create_grid
  (0...@num_cols).each do |x|
    (0...@num_rows).each do |y|
      num_neighbors = check_neighbors(x, y)

      if num_neighbors < 2 and @grid[x][y] == 1
        tmp_grid[x][y] = 0
      end
      if num_neighbors == 2 or num_neighbors == 3
        if @grid[x][y] == 1
          tmp_grid[x][y] = 1
        end
      end
      if num_neighbors == 3 and @grid[x][y] == 0
        tmp_grid[x][y] = 1
      end
      if num_neighbors > 3 and @grid[x][y] == 1
        tmp_grid[x][y] = 0
      end
    end
  end
  @grid = tmp_grid
end