Pygame Pong，球拍只能上下移动一次，恢复后球不会移动

Question

因此，我正在尝试创建一个单人Pong游戏。 我能够使球从屏幕上反弹并返回，但是当它碰到左侧的墙壁时，它会再生但不会移动。 同样，当尝试移动桨叶时，它只会像1个像素一样向上移动，而只能像向下一样移动1个像素，否则就不会再向上或向下移动。 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

如果您希望在按住箭头键的同时一直移动桨板，并且希望它在释放键时停止移动，则应该更改桨板的速度，而不是其位置。 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