def game_loop():
""" Main game loop. Contains event handling for crashes, moving between menus,
and score-keeping."""
# Defines object starting positions.
chicken_x = random.randrange(25, aspect_ratio[0] - 100)
chicken_y = -aspect_ratio[1]
vehicle_x = aspect_ratio[0] * 0.455
vehicle_y = aspect_ratio[1] * 0.75
# Defines object rectangles for collision detection.
chicken = Obstacles.Chicken(game_display, chicken_x, chicken_y, 74, 74)
car = Obstacles.Vehicle(game_display, vehicle_x, vehicle_y, 81, 240)
# Vertical displacement of chicken with each frame.
chicken_speed = aspect_ratio[1] * 0.00833
# Continuously updating score for the game.
score = 0
# Sets maximum number of chickens that will appear in the game.
chicken_count = 30
while chicken_count >= 0:
# Controls event handling for quitting and car movement.
for event in pygame.event.get():
Menus.quit_game(event)
car.move(event)
# Adds a hard cap to the chicken speed.
if chicken_speed < 0.02 * aspect_ratio[1]:
chicken_speed += 0.00075 * aspect_ratio[1]
chicken.move(chicken_speed)
# Handles scoring conditions.
if chicken.collide(car):
if score >= 50:
score -= 50
else:
score = 0
elif car.xpos < chicken.xpos < car.xpos + car.width or \
car.xpos < chicken.xpos + chicken.width + car.xpos + car.width:
score += int(30**(1 / (car.ypos -
(chicken.ypos + chicken.height))))
# Draws everything to the game display and updates chicken_count.
game_display.blit(background, (0, 0))
chicken_count = chicken.spawn(chicken_count)
chicken.draw()
car.draw()
# Updates the surface display.
pygame.display.update()
clock.tick(60)
