pygame-两个对象之间的碰撞不起作用

问题描述

我正在尝试重新创建“ Pong”，并且正在努力找出碰撞的原因。这是代码：

ball_x += ball_x_change
    collide = player_collision(player_x,ball_x,player_y,ball_y)
    if collide:
        ball_x -= ball_x_change
    ball(ball_x,ball_y)

这旨在将球从其起始位置移向玩家，并检查玩家图标和球是否发生碰撞。如果有，它将改变球的方向。然后将球渲染到屏幕上。这就是整个事情：

import pygame
import math

pygame.init()

screen = pygame.display.set_mode((800,600))

pygame.display.set_caption("Pong")

icon = pygame.image.load("ping-pong.png")
pygame.display.set_icon(icon)

player_icon = pygame.image.load("vertical-line.png")
player_x = 800 - (64 + 32)
player_y = 236
player_y_change = 0

cpu_icon = pygame.image.load("vertical-line.png")
cpu_x = 0 - 32
cpu_y = 236
cpu_y_change = 0

ball_icon = pygame.image.load("oval.png")
ball_x = 384
ball_y = 284
ball_x_change = 0.5
ball_y_change = 0

def player(player_x,player_y):
    screen.blit(player_icon,(player_x,player_y))

def cpu(cpu_x,cpu_y):
    screen.blit(cpu_icon,(cpu_x,cpu_y))

def ball(ball_x,ball_y):
    screen.blit(ball_icon,(ball_x,ball_y))

def player_collision(ball_x,ball_y,player_x,player_y):
    bump = math.hypot(player_x - ball_x,player_y - ball_y)
    if bump < 20:
        return True
    else:
        return False

running = True
while running:

    screen.fill((255,255,255))

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_DOWN:
                player_y_change += 1
            if event.key == pygame.K_UP:
                player_y_change -= 1
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_DOWN or pygame.K_UP:
                player_y_change = 0

    player_y += player_y_change
    if player_y <= 0:
        player_y = 0
    elif player_y >= 472:
        player_y = 472
    player(player_x,player_y)

    cpu_y += cpu_y_change
    if cpu_y <= 0:
        player_y = 0
    elif player_y >= 472:
        player_y = 472
    cpu(cpu_x,cpu_y)

    ball_x += ball_x_change
    collide = player_collision(player_x,ball_y)

    pygame.display.update()

感谢您的时间。

更新了代码，但仍然无法使用：

import pygame
import math

pygame.init()

screen = pygame.display.set_mode((800,600))

pygame.display.set_caption("Pong")

icon = pygame.image.load("ping-pong.png")
pygame.display.set_icon(icon)

player_icon = pygame.image.load("vertical-line.png")
player_x = 672
player_y = 236
player_y_change = 0

cpu_icon = pygame.image.load("vertical-line.png")
cpu_x = 0
cpu_y = 236
cpu_y_change = 0

ball_icon = pygame.image.load("oval.png")
ball_x = 384
ball_y = 284
ball_x_change = 0.8
ball_y_change = 0

def player(player_x,player_y):
    touch = math.hypot(player_x - ball_x,ball_y - player_y)
    if touch < 10:
        return True
    else:
        return False

running = True
while running:

    screen.fill((255,cpu_y)

    ball_x += ball_x_change
    collide = player_collision(ball_x,player_y)
    if collide:
        ball_x_change = -ball_x_change
        ball_x += ball_x_change
    ball(ball_x,ball_y)

    pygame.display.update()

解决方法

函数player_collision在(ball_x,ball_y,player_x,player_y)中接受其参数，但是在调用该函数时，您按错误的顺序输入了参数

collide = player_collision(player_x,ball_x,player_y,ball_y)
#should be
collide = player_collision(ball_x,player_y)

您还应该执行@RFairey建议的操作并添加ball_x_change *= -1

就像发生碰撞时一样，您只需将球向x后退一步：

register

要反转其方向，您还需要消除ball_x_change，以便在弹跳后沿另一个方向移动：

serve

collision-detection pygame python