Refactor main.py: Fix Event Loop, Collision Checks, and Random Usage Bugs

[GitJohnFis]

The main.py file contains several bugs and structural issues that hinder the game's functionality. Below is a list of the identified bugs and a proposed refactored code snippet to illustrate the required changes:

Identified Bugs:

1. Undefined Variable:

   • The reference to players.containers is invalid since players is not defined anywhere in the code.

2. Incorrect Collision Checks:

   • The code uses player.collides_with(player) to check collisions with asteroids. It should instead compare the player with each asteroid (i.e., player.collides_with(asteroid)).
   • Similarly, shot.collides_with(shot) is used within the shot loop, which is incorrect. It should be checking the shot against asteroids (i.e., shot.collides_with(asteroid)).

3. Powerup Handling Errors:

   • The incorrect reference of power_up.power_type is used instead of powerup.power_type.
   • There are typos with "sheild" instead of "shield" and the incorrect method name activate_sheild() instead of activate_shield().

4. Random Module Usage:

   • The random.choice function is misused with two separate arguments: random.choice(["shield"], ["speed"]) instead of random.choice(["shield", "speed"]).
   • Ensuring proper use of random.random() for determining a 20% chance of spawning a powerup.

5. Pre-Game Loop Code Execution:

   • The powerup update/draw block is executed before the game loop starts, using dt before it has been assigned.

6. Structural Issues in the Game Loop:

   • The event loop, updates, collision checks, and drawing logic are not well-organized, leading to potential runtime errors and poor maintainability.

Proposed Refactored Code Snippet:

import pygame
import sys
import random

from player import Player
from constants import *
from asteroid import Asteroid
from asteroidfield import AsteroidField
from shoot import Shot
from powerups import PowerUp

def main():
    pygame.init()
    screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
    clock = pygame.time.Clock()

    # Initialize sprite groups
    updatable = pygame.sprite.Group()
    drawable = pygame.sprite.Group()
    asteroids = pygame.sprite.Group()
    shots = pygame.sprite.Group()
    powerups = pygame.sprite.Group()

    # Set container references
    Asteroid.containers = (asteroids, updatable, drawable)
    Shot.containers = (shots, updatable, drawable)
    AsteroidField.containers = updatable
    PowerUp.containers = (powerups, updatable, drawable)

    asteroid_field = AsteroidField()
    player = Player(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2)

    dt = 0
    running = True
    while running:
        # Event handling
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False
        
        # Update all objects
        updatable.update(dt)
        
        # Check for player-asteroid collisions
        for asteroid in asteroids:
            if player.collides_with(asteroid):
                print("Game Over!")
                pygame.quit()
                sys.exit()

        # Check for player-powerup collisions
        for powerup in powerups:
            if player.collides_with(powerup):
                if powerup.power_type == "shield":
                    player.activate_shield()
                elif powerup.power_type == "speed":
                    player.activate_speed_boost()
                powerups.remove(powerup)

        # Check for shot-asteroid collisions
        for shot in shots:
            for asteroid in asteroids:
                if shot.collides_with(asteroid):
                    shot.kill()
                    asteroid.split()
                    if random.random() <= 0.2:
                        power_type = random.choice(["shield", "speed"])
                        spawn_powerup = PowerUp(asteroid.position.x, asteroid.position.y, power_type)
                        powerups.add(spawn_powerup)

        # Drawing
        screen.fill("black")
        for obj in drawable:
            obj.draw(screen)
        player.draw(screen)
        pygame.display.flip()
        dt = clock.tick(60) / 1000
    pygame.quit()

if __name__ == "__main__":
    main()

// Please review this draft issue.