Pygame Pong，Paddle只上下移动一次，再生后球不移动

Question

所以我试图创建一个单人Pong游戏。我能够让球从屏幕上反弹回来，但是当它击中左侧的墙时，它会再生，但不会移动。此外，当试图移动桨时，它只会像1像素一样向上移动，并且只会向下移动1个像素，然后它不会再向上或向下移动。这很难解释，所以这里是代码。

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

如果你想为一个箭头键被按下桨只要移动，并希望它停止移动键被释放时，那么你应该改变桨的速度，而不是它的位置。示例实现：

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