为什么我的 pygame 精灵组敌人会破坏边界条件？

问题描述

我和我的朋友都是 pygame 的新用户，他们注意到我们的代码结果存在问题。我想了解为什么敌人似乎变得更快并在某些时候穿越边界。我们为边界设置了条件，使敌人的精灵始终从边界反弹。

Here is a preview of the error

import pygame,sys,random,time
from pygame.locals import *
pygame.init()
screen_height = 870
screen_width = 1530
screen = pygame.display.set_mode((screen_width,screen_height))
fpsfunc = pygame.time.Clock()
enemy_speed = 1
SPAWNENEMY = USEREVENT + 1
pygame.time.set_timer(SPAWNENEMY,1000)

class Player(pygame.sprite.Sprite):
    def __init__(self):
        super().__init__()
        self.surf = pygame.Surface((50,50))
        self.surf.fill((255,0))
        self.rect = self.surf.get_rect(center=(screen_width / 2,screen_height - 100))

    def update(self,pressed_keys):
        if pressed_keys[K_d]:
            self.rect.move_ip(3,0)
        if pressed_keys[K_a]:
            self.rect.move_ip(-3,0)
        if pressed_keys[K_w]:
            self.rect.move_ip(0,-5)
        if pressed_keys[K_s]:
            self.rect.move_ip(0,1)
        if self.rect.left <= 0:
            self.rect.left = 0
        if self.rect.top <= 0:
            self.rect.top = 0
        if pressed_keys[K_SPACE]:
            bullet_sprites.add(player.create_bullet())

    def create_bullet(self):
        return PlayerBullet(self.rect.x + 25,self.rect.y)


class PlayerBullet(pygame.sprite.Sprite):
    def __init__(self,pos_x,pos_y):
        super().__init__()
        self.image = pygame.Surface((10,30))
        self.image.fill((0,255,255))
        self.rect = self.image.get_rect(center=(pos_x,pos_y))

    def update(self):
        self.rect.y -= 5
        if self.rect.y + 30 < 0:
          self.kill()
  

class Enemy(pygame.sprite.Sprite):
    def __init__(self,nice1,nice2):
        super(Enemy,self).__init__()
        self.image = pygame.Surface((35,35))
        self.image.fill((0,255))
        self.rect = self.image.get_rect(center = (nice1,nice2))
    def update(self):
        global enemy_speed
        self.rect.x += 3 * enemy_speed
        if self.rect.right >= screen_width:
          enemy_speed = -1
        if self.rect.left <= 0:
          enemy_speed = 1
        if pygame.sprite.spritecollide(self,bullet_sprites,True):
          self.kill()

def createnem(pos1,pos2):
    return Enemy(pos1,pos2)
  

player = Player()


bullet_sprites = pygame.sprite.Group()
enemy_sprites = pygame.sprite.Group()

while True:
    random1 = random.randint(1,100)
    random2 = random.randint(1,100)
    for event in pygame.event.get():
        if event.type == KEYDOWN:
            if event.key == K_ESCAPE:
                pygame.quit()
                sys.exit()
        if event.type == MOUSEBUTTONDOWN:
            bullet_sprites.add(player.create_bullet())
        if event.type == SPAWNENEMY and len(enemy_sprites) < 3:
            enemy_sprites.add(createnem(random1,random2))

    pressed_keys = pygame.key.get_pressed()
    screen.fill((0,0))
    screen.blit(player.surf,player.rect)
    bullet_sprites.draw(screen)
    enemy_sprites.draw(screen)
    player.update(pressed_keys)
    enemy_sprites.update()
    bullet_sprites.update()
    pygame.display.update()
    fpsfunc.tick(60)

解决方法

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