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我是 python/pygame 的新手，我正在尝试进行 boids 模拟，但似乎无法创建边框，以便 boids 不会超出窗口。这是我到目前为止所做的。

 #importing the needed modules and libraries 
import pygame, sys, random, pygame.math

#Initialize pygame and pygame time
pygame.init()
clock = pygame.time.Clock()

#This is some screen settings, giving the screen size.
screen_width = 1000
screen_height = 750
screen = pygame.display.set_mode((screen_width, screen_height))

#Making the background, loading it and scaling the background to fit the screen.
background = pygame.image.load("Background.jpg")
background = pygame.transform.scale(background, (screen_width, screen_height))

#Make parent-class for boids and hoiks
class Moving_Object(pygame.sprite.Sprite):
    def __init__(self, picture_load, X_pos, Y_pos): #speed_x, speed_y
        super().__init__()
        #Creating picture_load to make it easier to load image. Creating a rectangle around image
        self.image = pygame.image.load(picture_load)
        self.image = pygame.transform.scale(self.image, (40, 40))
        #Make rectangle around image
        self.rect = self.image.get_rect()
        self.rect.center = [X_pos, Y_pos]
        self.speed_x = random.randint(-3,3)
        self.speed_y = random.randint(-3,3)

    def border(self):
        if self.rect.right >= screen_width or self.rect.left <= 0:
            self.speed_x *= -1
        if self.rect.bottom >= screen_height or self.rect.top <= 0:
            self.speed_y *= -1
        if self.rect.collidrect(boid):
            print("yesir")


    def update(self):
        self.rect.x += self.speed_x
        self.rect.y += self.speed_y
    
    


    #making moving_object group and adding boids & hoiks
    moving_object_group = pygame.sprite.Group()
    for boid in range(50):
        new_boid = Moving_Object("Logo.png", random.randrange(0, screen_width), random.randrange(0, screen_height))
        moving_object_group.add(new_boid)
    
    for hoiks in range(10):
        new_hoik = Moving_Object('skullObstacle.png',random.randrange(0, screen_width), random.randrange(0, screen_height))
        moving_object_group.add(new_hoik)

"""游戏厕所，它保持窗口打开并检查事件并调用不同的类和方法""" while True: for event in pygame.event.get(): if event.type == pygame.QUIT: pygame.退出（） sys.exit（）

    pygame.display.flip()
    screen.blit(background, (0,0))
    moving_object_group.draw(screen)
    moving_object_group.update()
    clock.tick(60)
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