Pygame Bullet Movement

Question

So I was trying to code a space invaders game and I got stuck while trying to figure out how to shoot bullets so they appear like animation and not teleport to the end position where they collide (top of the screen) and I don't know how to do that I was trying to figure out a lot but nothing helped it just kept teleporting Note: player is the instance of the Player class so that why I did the 'player.', I'm just trying to practice classes

if event.type == pygame.KEYDOWN:
    if event.key == pygame.K_SPACE:
        while player.bullet_rect.y > 0:
            player.bullet_rect.y -= bullet_velocity

This question is duplicate. It has been asked 100 times and the answer is still the same. — Rabbid76, Feb 07 '21 at 13:04

Rabbid76 · Answer 1 · 2021-02-07T13:37:09.463

You must implement bullet movement in the application loop, not in an additional loop within the event loop. Add a fired variable that indicates whether pressing SPACE fired the bullet. Move the bullet when the fired status is set. Reset fired when the bullet reaches the top of the screen:

fired = False

while run:
    # [...]

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                fired = True

    if fired:
        player.bullet_rect.y -= bullet_velocity
        if player.bullet_rect.y < 0:
            fired = False

The general approach to firing bullets is to store the positions of the bullets in a list (bullet_list). When a bullet is fired, add a copy of the bullet rectangle to the list. The starting position is the position of the player. Use a for-loop to iterate through all the bullets in the list. Move position of each individual bullet in the loop. Remove a bullet from the list that leaves the screen (bullet_list.remove(bullet_pos)). For this reason, a copy of the list (bullet_list[:]) must be run through (see How to remove items from a list while iterating?). Use another for-loop to blit the remaining bullets on the screen:

bullet_list = []

while run:
    # [...]

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                
                # create bullet rectangle with the position of the player
                bullet_rect = 
                
                bullet_list.append(bullet_rect)

    for bullet_rect in bullet_list[:]:
        bullet_rect.y += bullet_velocity
        if bullet_rect.y < 0:
            bullet_list.remove(bullet_rect)

    # [...]

    for bullet_rect in bullet_list[:]
        # draw bullet at bullet_rect 
        # [...]

Pygame Bullet Movement

1 Answers1