【问题标题】:Pygame collision check bug [duplicate]Pygame碰撞检查错误[重复]
【发布时间】:2020-03-27 19:36:15
【问题描述】:

我最近开始在 Pygame 中制作 Atari Breakout,但遇到了一个奇怪的错误。每当球接触桨的左侧时,它会正常反弹,但当它在右侧时,它会飞过桨。请帮忙,因为我不知道如何解决它。

这是我的代码:

import pygame, random, math

pygame.init()

screen = pygame.display.set_mode((800,600))
pygame.display.set_caption('Atari Breakout')

player = pygame.image.load('player copy.png')
ball = pygame.image.load('poland.png')

ballx, bally = 400, 300
balldx, balldy = 2,2
def isCollision(x1,y1,x2,y2):
    distance = math.sqrt(math.pow(x1 - x2, 2) + math.pow(y1 - y2, 2))
    if distance <= 32:
        return True
    else:
        return False
running = True

while running:

    screen.fill((0,0,0))

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

    pos = pygame.mouse.get_pos()
    if isCollision(ballx, bally, pos[0], 525):
        balldy *= -1
    if bally >= 0:
        balldy *= -1
    if bally <= 570:
        balldy *= -1
    if ballx <= 0:
        balldx *= -1
    if ballx >= 770:
        balldx *= -1

    ballx += balldx
    bally += balldy

    screen.blit(player, (pos[0], 525))
    screen.blit(ball, (ballx,bally))

    pygame.display.update()

【问题讨论】:

    标签: python python-3.x pygame collision-detection


    【解决方案1】:

    实际上isCollision 计算了围绕球的矩形左上角和球拍左上角之间的Euclidean distance
    玩家(桨)的形状是一个长方形,边很长,边很短。因此,碰撞算法根本不起作用。我推荐使用pygame.Rect 对象和colliderect,来检测球和球员之间的碰撞。例如:

    def isCollision(x1,y1,x2,y2):
        ballRect = ball.get_rect(topleft = (x1, y1))
        playerRect = player.get_rect(topleft = (x2, y2))
        return ballRect.colliderect(playerRect)
    
    while running:
        # [...]
    
        pos = pygame.mouse.get_pos()
        if isCollision(ballx, bally, pos[0], 525):
            balldy *= -1
    

    【讨论】:

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