关于pygame的问题

yuki0nagato

零基础学python的pygame碰撞检测的课件内容,自己打了一遍发现有个问题:

import pygame
import sys
import random
from pygame.locals import *

class Ball(pygame.sprite.Sprite):

    def __init__(self, image, position, speed, bg_size):
        self.image = pygame.image.load(image).convert_alpha()
        self.rect = self.image.get_rect()
        self.rect.left, self.rect.top = position
        self.speed = speed
        self.width, self.height = bg_size
        self.radius = self.rect.width / 2
        pygame.sprite.Sprite.__init__(self) #sprite

    def move(self):
        self.rect = self.rect.move(self.speed) ##移动放在前面就不会
        
        if self.rect.right < 0:
            self.rect.left = self.width
        elif self.rect.left > self.width:
            self.rect.right = 0
        elif self.rect.top > self.height:
            self.rect.bottom = 0
        elif self.rect.bottom < 0:
            self.rect.top = self.height
       
        ## self.rect = self.rect.move(self.speed) 如果把移动放在判断后面会出现两个小球难分难解的情况
        

def main():
    pygame.init()

    image = 'gray_ball.png'
    bg = 'background.png'

    runing = True

    
    bg_size = width, height = 1024, 681

    screen = pygame.display.set_mode(bg_size)
    pygame.display.set_caption('Play the ball')
    background = pygame.image.load(bg).convert_alpha()
    
    clock = pygame.time.Clock()
    balls = []
    group = pygame.sprite.Group()
    for each in range(5):
        position = random.randint(0, width-100), random.randint(0, height-100)
        speed = [random.randint(-5, 5), random.randint(-5, 5)]
        ball = Ball(image, position, speed, bg_size)
        while pygame.sprite.spritecollide(ball, group, False, pygame.sprite.collide_circle):
            ball.rect.left, ball.rect.top = random.randint(0, width-100), random.randint(0, height-100)
        balls.append(ball)
        group.add(ball)
        
    while runing:
        for event in pygame.event.get():
            if event.type == QUIT:
                sys.exit()

        screen.blit(background, (0, 0))
        for each_ball in balls:
            screen.blit(each_ball.image, each_ball.rect) 
            each_ball.move()

        for each in group:
            group.remove(each)
            if pygame.sprite.spritecollide(each, group, False, pygame.sprite.collide_circle):
                each.speed[0] = -each.speed[0]
                each.speed[1] = -each.speed[1]
            group.add(each)
        pygame.display.flip()
        clock.tick(120)

if __name__ == '__main__':
    main()

yuki0nagato

想知道造成难解难分的原因