Pygame Pong，Paddle只上下移動一次，再生後球不移動

Question

所以我試圖創建一個單人Pong遊戲。我能夠讓球從屏幕上反彈回來，但是當它擊中左側的牆時，它會再生，但不會移動。此外，當試圖移動槳時，它只會像1像素一樣向上移動，並且只會向下移動1個像素，然後它不會再向上或向下移動。這很難解釋，所以這裏是代碼。

import sys 
import pygame 
pygame.init() 

size = width, height = 1000, 800 
screenColor = 0, 0, 0 
outline = 0, 0, 255 

paddleOne = pygame.image.load("PONGPADDLE.png") 
ball = pygame.image.load("Bullet.png") 
ballRect = ball.get_rect() 
paddleRect = paddleOne.get_rect() 
speed = [1, 1] 
paddleOne_x = 980 
paddleOne_y = 400 
FPS = 1000 
fpsClock = pygame.time.Clock() 

paddleOnePos_x = 0 
paddleOnePos_y = 0 

screen = pygame.display.set_mode(size) 

while 1: 
    for event in pygame.event.get(): 
     if event.type == pygame.QUIT: 
      sys.exit() 

     elif event.type == pygame.KEYDOWN: 
      if event.key == pygame.K_UP: 
       paddleRect.y += 10 
       if paddleRect.top > 0: 
        paddleRect.top = -1 
      if event.key == pygame.K_DOWN: 
       paddleRect.y -= 10 
       if paddleRect.bottom < 800: 
        paddleRect.top = +1 

     if event.type == pygame.KEYUP: 
      if event.key == pygame.K_UP: 
       paddleRect_y = 0 
      if event.key == pygame.K_DOWN: 
       paddleRect_y = 0 

    ballRect = ballRect.move(speed) 
    if ballRect.right > width: 
     speed[0] = -speed[0] 

    if ballRect.top < 0 or ballRect.bottom > height: 
     speed[1] = -speed[1] 

    if ballRect.left < 0: 
     ballRect = ball.get_rect() 
    elif ballRect.colliderect(paddleRect): 
     speed[1] = -speed[1] 


    paddleOne_y += paddleRect.bottom 
    paddleOne_y += paddleRect.top 

    screen.fill(screenColor) 
    screen.blit(paddleOne, (paddleRect.left, paddleRect.top)) 
    # screen.blit(paddleOne, (paddleOne_x, paddleOne_y)) 
    screen.blit(ball, ballRect) 
    pygame.draw.rect(screen, outline, ((0, 0), (width, height)), 5) 
    pygame.display.flip() 
    fpsClock.tick(FPS) 

Answer 1

如果你想爲一個箭頭鍵被按下槳只要移動，並希望它停止移動鍵被釋放時，那麼你應該改變槳的速度，而不是它的位置。示例實現：

paddle_y_velocity = 0 

while 1: 
    if paddleRect.top < 0: 
     paddleRect.top = 0 
    if paddleRect.bottom > 800: 
     paddleRect.bottom = 800 

    for event in pygame.event.get(): 
     if event.type == pygame.QUIT: 
      sys.exit() 

     elif event.type == pygame.KEYDOWN: 
      if event.key == pygame.K_UP: 
       paddle_y_velocity -= 1 
      if event.key == pygame.K_DOWN: 
       paddle_y_velocity += 1 

     if event.type == pygame.KEYUP: 
      if event.key == pygame.K_UP or event.key == pygame.K_DOWN: 
       paddle_y_velocity = 0 

    paddleRect.top += paddle_y_velocity 

    ballRect = ballRect.move(speed) 
    #etc