constants.py

# Color constants
GREEN = (0, 255, 0)
YELLOW = (255, 255, 0)
BLUE_SKY = (135, 206, 235)

# Game constants
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
BIRD_WIDTH = 30
BIRD_HEIGHT = 30
BIRD_X_POSITION = 100

# Physics constants
GRAVITY = 800
FLAP_STRENGTH = -300
BIRD_INITIAL_Y = SCREEN_HEIGHT // 2

# Pipe constants
PIPE_WIDTH = 60
PIPE_GAP_HEIGHT = 150
PIPE_SPEED = 200
PIPE_SPAWN_DISTANCE = 300
PIPE_MIN_GAP_Y = 100
PIPE_MAX_GAP_Y = SCREEN_HEIGHT - 250

# Neural network constants
NN_INPUT_SIZE = 4 # Vectorized bird states: [y_pos, y_velocity, fitness, alive]
NN_HIDDEN1_SIZE = 8
NN_HIDDEN2_SIZE = 16
NN_OUTPUT_SIZE = 1
NN_ARCHITECTURE = [NN_INPUT_SIZE, NN_HIDDEN1_SIZE, NN_HIDDEN2_SIZE, NN_OUTPUT_SIZE]

# Evolution constants
DEFAULT_POPULATION_SIZE = 2000
ELITE_PERCENTAGE = 0.2  # Top 20% as parents
ELITE_SURVIVORS = 10    # Best performers to keep unchangeable
MUTATION_RATE = 0.1
MUTATION_STRENGTH = 0.1
CROSSOVER_THRESHOLD = 0.5

# Simulation constants
DEFAULT_FPS = 60
DEFAULT_GENERATION_TIME = 30
SURVIVAL_POINTS_PER_SECOND = 100
PIPE_PASS_BONUS = 1000

# Constants to normalize NN inputs
Y_POSITION_NORM = 600.0
VELOCITY_NORM = 400.0
DISTANCE_NORM = 800.0
GAP_RELATIVE_NORM = 300.0

# Visualization constants
GENERATION_DISPLAY_INTERVAL = 5