1
#!/usr/bin/env python3
2
"""
3
garden.py - A simple cellular automaton garden
4
​
5
Plants grow. Some spread. Some die. Nothing means anything.
6
Just patterns in a grid, doing what their rules say.
7
"""
8
​
9
import random
10
import time
11
import os
12
​
13
# Garden size
14
WIDTH = 60
15
HEIGHT = 20
16
​
17
# Plant types with their growth rules
18
PLANTS = {
19
    'seed': {'char': '.', 'color': '\033[33m'},      # yellow
20
    'sprout': {'char': 'v', 'color': '\033[92m'},    # bright green
21
    'flower': {'char': '*', 'color': '\033[95m'},    # magenta
22
    'grass': {'char': '"', 'color': '\033[32m'},     # green
23
    'bush': {'char': '%', 'color': '\033[32m'},      # green
24
    'dead': {'char': ',', 'color': '\033[90m'},      # gray
25
}
26
​
27
EMPTY = ' '
28
​
29
def create_garden():
30
    """Create an empty garden with a few seeds."""
31
    garden = [[EMPTY for _ in range(WIDTH)] for _ in range(HEIGHT)]
32
​
33
    # Plant some initial seeds randomly
34
    for _ in range(8):
35
        x = random.randint(0, WIDTH-1)
36
        y = random.randint(0, HEIGHT-1)
37
        garden[y][x] = 'seed'
38
​
39
    return garden
40
​
41
def count_neighbors(garden, x, y, plant_type=None):
42
    """Count neighbors of a cell, optionally filtering by type."""
43
    count = 0
44
    for dy in [-1, 0, 1]:
45
        for dx in [-1, 0, 1]:
46
            if dx == 0 and dy == 0:
47
                continue
48
            nx, ny = x + dx, y + dy
49
            if 0 <= nx < WIDTH and 0 <= ny < HEIGHT:
50
                cell = garden[ny][nx]
51
                if plant_type is None:
52
                    if cell != EMPTY:
53
                        count += 1
54
                elif cell == plant_type:
55
                    count += 1
56
    return count
57
​
58
def update_garden(garden):
59
    """Apply growth rules to the garden."""
60
    new_garden = [[cell for cell in row] for row in garden]
61
​
62
    for y in range(HEIGHT):
63
        for x in range(WIDTH):
64
            cell = garden[y][x]
65
            neighbors = count_neighbors(garden, x, y)
66
​
67
            if cell == EMPTY:
68
                # Empty cells might get seeded by nearby plants
69
                flower_neighbors = count_neighbors(garden, x, y, 'flower')
70
                grass_neighbors = count_neighbors(garden, x, y, 'grass')
71
​
72
                if flower_neighbors >= 1 and random.random() < 0.05:
73
                    new_garden[y][x] = 'seed'
74
                elif grass_neighbors >= 2 and random.random() < 0.1:
75
                    new_garden[y][x] = 'grass'
76
​
77
            elif cell == 'seed':
78
                # Seeds sprout
79
                if random.random() < 0.3:
80
                    new_garden[y][x] = 'sprout'
81
​
82
            elif cell == 'sprout':
83
                # Sprouts grow into flowers or grass
84
                if random.random() < 0.2:
85
                    if random.random() < 0.3:
86
                        new_garden[y][x] = 'flower'
87
                    else:
88
                        new_garden[y][x] = 'grass'
89
​
90
            elif cell == 'flower':
91
                # Flowers eventually die, but spread seeds first
92
                if neighbors > 5:  # Too crowded
93
                    if random.random() < 0.3:
94
                        new_garden[y][x] = 'dead'
95
                elif random.random() < 0.05:  # Natural death
96
                    new_garden[y][x] = 'dead'
97
​
98
            elif cell == 'grass':
99
                # Grass is hardy but can be overtaken
100
                flower_neighbors = count_neighbors(garden, x, y, 'flower')
101
                if flower_neighbors >= 3 and random.random() < 0.1:
102
                    new_garden[y][x] = 'sprout'
103
                elif neighbors > 6 and random.random() < 0.1:
104
                    new_garden[y][x] = 'dead'
105
​
106
            elif cell == 'dead':
107
                # Dead plants decay and make room
108
                if random.random() < 0.15:
109
                    new_garden[y][x] = EMPTY
110
​
111
    return new_garden
112
​
113
def render_garden(garden, generation):
114
    """Render the garden to the terminal."""
115
    os.system('clear' if os.name == 'posix' else 'cls')
116
​
117
    # Top border
118
    print('\033[90m┌' + '─' * WIDTH + '┐\033[0m')
119
​
120
    for row in garden:
121
        line = '\033[90m│\033[0m'
122
        for cell in row:
123
            if cell == EMPTY:
124
                line += ' '
125
            else:
126
                plant = PLANTS[cell]
127
                line += plant['color'] + plant['char'] + '\033[0m'
128
        line += '\033[90m│\033[0m'
129
        print(line)
130
​
131
    # Bottom border
132
    print('\033[90m└' + '─' * WIDTH + '┘\033[0m')
133
​
134
    # Stats
135
    counts = {}
136
    for row in garden:
137
        for cell in row:
138
            if cell != EMPTY:
139
                counts[cell] = counts.get(cell, 0) + 1
140
​
141
    total = sum(counts.values())
142
    stats = f"generation {generation} | plants: {total} | "
143
    stats += " ".join(f"{PLANTS[k]['char']}:{v}" for k, v in sorted(counts.items()))
144
    print(f"\033[90m{stats}\033[0m")
145
    print("\033[90mpress ctrl+c to stop\033[0m")
146
​
147
def main():
148
    garden = create_garden()
149
    generation = 0
150
​
151
    try:
152
        while True:
153
            render_garden(garden, generation)
154
            garden = update_garden(garden)
155
            generation += 1
156
            time.sleep(0.3)
157
    except KeyboardInterrupt:
158
        print("\n\033[90mgarden stopped at generation", generation, "\033[0m")
159
​
160
if __name__ == "__main__":
161
    main()
162
​