I made a border in this pong game, but the paddles can cross it. How do I stop that?

Question

I made a border in this pong game, and the paddles on the screen can cross it. I have done this before in another piece of code, but everything\'s different now. I have a ma

Answer 1

To keep the paddles on the field, add a check in the game loop to block paddle movement when the paddle reaches an edge.

.......
if pong.rect.x < 10:
    pong.rect.x, pong.rect.y = 375, 250
    pong.dx = 1
    paddle2.points += 1

# keep paddles in correct range     # add this section
if paddle1.rect.y < 0 : paddle1.rect.y = 0
if paddle3.rect.y < 0 : paddle3.rect.y = 0
if paddle2.rect.y < 200 : paddle2.rect.y = 200
if paddle4.rect.y < 200 : paddle4.rect.y = 200
if paddle1.rect.y > 200 - 75 : paddle1.rect.y = 200 - 75
if paddle3.rect.y > 200 - 75 : paddle3.rect.y = 200 - 75
if paddle2.rect.y > 500 - 75 : paddle2.rect.y = 500 - 75
if paddle4.rect.y > 500 - 75 : paddle4.rect.y = 500 - 75  

#if the ball and paddle collide, bounce off it
if paddle1.rect.colliderect(pong.rect):
    pong.dx = 1
if paddle2.rect.colliderect(pong.rect):
    pong.dx = -1
.....

Answer 2

PyGame has a feature that does exactly what you want it to do. Use pygame.Rect objects and pygame.Rect.clamp() respectively pygame.Rect.clamp_ip():

Returns a new rectangle that is moved to be completely inside the argument Rect.

With this function, an object can be kept completely in the window. Get the window rectangle with get_rectand clamp the object in the window:

while run:
    # [...]

    key = pygame.key.get_pressed()
    if key[pygame.K_w]:
        paddle1.rect.y += -paddle_speed
    
    # [...]
    
    winRect = win.get_rect()
    paddle1.rect.clamp_ip(winRect)
    paddle2.rect.clamp_ip(winRect)
    paddle3.rect.clamp_ip(winRect)
    paddle4.rect.clamp_ip(winRect)

    # [...]