如何解决创建一个太空入侵者类型的游戏，但很难弄清楚如何一次打印 1 个小行星
截至目前，游戏会同时打印所有小行星。我正在尝试使打印小行星的循环运行并等待几秒钟，然后再绘制下一个（截至目前，我将其设置为 20 个小行星）。我尝试使用 time.sleep 和 pygame.time.wait 没有运气。
处理这些任务的代码可以在 Asteroids 类、_create_asteroids 函数和 _create_astroid 函数中找到。最后，它们都在 Game 类的 run_game 函数中调用。谢谢！
class Game:
""" a class the creates a window with a blue screen """
def __init__(self):
pygame.init()
#--------------------------------------------------------------------------------------------
#screen size,color,caption
self.screen = pygame.display.set_mode((1200,800)) #create attribute to hold display settings
self.bg_color = (0,0) #create attribute to hold RGB color (blue)
pygame.display.set_caption("Blue Screen")
#--------------------------------------------------------------------------------------------
#--------------------------------------------------------------------------------------------
#tank drawing
self.screen_rect = self.screen.get_rect() #get the screen rect dim
self.image = pygame.image.load('images/tank.bmp') #load the image from directory
self.rect = self.image.get_rect() #get the image rect dim
self.rect.center = self.screen_rect.center #store the screens center x/y coord
#tank movement
self.tank_moving_left = False
self.tank_moving_right = False
self.tank_moving_up = False
self.tank_moving_down = False
self.tank_speed = 1 #tank pixels
self.direction_right = self.image #holds right image
self.direction_left = pygame.transform.flip(self.image,True,False) #holds left image
#--------------------------------------------------------------------------------------------
#--------------------------------------------------------------------------------------------
#bullet
self.bullets = pygame.sprite.Group()
self.current_direction = self.direction_right
#--------------------------------------------------------------------------------------------
#--------------------------------------------------------------------------------------------
#asteroids
self.asteroids = pygame.sprite.Group()
self._create_asteroids()
#--------------------------------------------------------------------------------------------
def move(self):
""" move tnak tank_speed based on direction of movement (key pressed)
also detect collision """
if self.tank_moving_right and self.rect.right < self.screen_rect.right:
self.rect.x += self.tank_speed
if self.tank_moving_left and self.rect.left > self.screen_rect.left:
self.rect.x -= self.tank_speed
if self.tank_moving_down and self.rect.bottom < self.screen_rect.bottom:
self.rect.y += self.tank_speed
if self.tank_moving_up and self.rect.top > self.screen_rect.top:
self.rect.y -= self.tank_speed
def blitme(self):
""" draw the image of the tank """
self.screen.blit(self.image,self.rect)
def _update_screen(self):
""" update screen """
self.screen.fill(self.bg_color)
self.blitme()
for bullet in self.bullets.sprites():
self.bullets.draw(self.screen)
#print(bullet.rect)
self.asteroids.draw(self.screen)
pygame.display.flip()
def _check_KEYDOWN(self,event):
""" when key is press either quit,or move direction of arrow pressed and flip image """
if event.key == pygame.K_q:
sys.exit()
elif event.key == pygame.K_RIGHT:
self.tank_moving_right = True
self.image = self.direction_right
self.current_direction = self.direction_right
elif event.key == pygame.K_LEFT:
self.tank_moving_left = True
self.image = self.direction_left
self.current_direction = self.direction_left
elif event.key == pygame.K_UP:
self.tank_moving_up = True
elif event.key == pygame.K_DOWN:
self.tank_moving_down = True
elif event.key == pygame.K_SPACE:
self._fire_bullet()
def _check_KEYUP(self,event):
""" when key is let go stop moving """
if event.key == pygame.K_RIGHT:
self.tank_moving_right = False
elif event.key == pygame.K_LEFT:
self.tank_moving_left = False
elif event.key == pygame.K_UP:
self.tank_moving_up = False
elif event.key == pygame.K_DOWN:
self.tank_moving_down = False
def _fire_bullet(self):
""" create a bullet and add it to the bullets group """
if self.current_direction == self.direction_left:
#create new bullet and set bullet path
new_bullet = Bullet(self)
new_bullet.bullet_shootRight = False
new_bullet.bullet_shootLeft = True
#change direction of bullet starting point
new_bullet.x -= 100
#add bullet to sprite list
self.bullets.add(new_bullet)
elif self.current_direction == self.direction_right:
#create new bullet and set bullet path
new_bullet = Bullet(self)
new_bullet.bullet_shootRight = True
new_bullet.bullet_shootLeft = False
#change direction of bullet starting point
#add bullet to sprite list
self.bullets.add(new_bullet)
def run_game(self):
""" loops the game/ updates screen/ checks for key clicks"""
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:
self._check_KEYDOWN(event)
elif event.type == pygame.KEYUP:
self._check_KEYUP(event)
self.move()
self.bullets.update()
self.asteroids.update()
#get rid of bullets that have disapeared
for bullet in self.bullets.copy():
if bullet.rect.left >= 1200 or bullet.rect.right <= 0:
self.bullets.remove(bullet)
#print(len(self.bullets))
self._update_screen()
def _create_asteroids(self):
""" create the asteroid shower """
#create a asteroid
asteroid = Asteroid(self)
self.asteroids.add(asteroid)
number_of_aliens = 20
for asteroid_num in range(number_of_aliens):
self._create_asteroid()
def _create_asteroid(self):
asteroid = Asteroid(self)
if asteroid.x <= 0:
asteroid.direction = 1
elif asteroid.x >= 1160:
asteroid.direction = -1
self.asteroids.add(asteroid)
class Bullet(Sprite):
""" A class to manage bullets fired from the ship """
def __init__(self,game):
""" create a bullet object at the ships current position """
super().__init__()
self.screen = game.screen
self.bullet_speed = 2.0
self.bullet_width = 20
self.bullet_height = 5
self.bullet_color = (0,200,200)
self.bullet_shootRight = False
self.bullet_shootLeft = False
self.image = pygame.Surface((self.bullet_width,self.bullet_height))
self.image.fill(self.bullet_color)
self.rect = self.image.get_rect()
self.rect.midright = game.rect.midright
self.rect.y -= 5 #the tanks barrel is 5 pixels above center
self.rect.x += 15
#store the bullets position as a decimal value
self.y = float(self.rect.y)
self.x = float(self.rect.x)
def update(self):
""" move the bullet up the screen """
#update the decimal position of the bullet.
if self.bullet_shootRight:
self.x += self.bullet_speed
self.rect.x = self.x
elif self.bullet_shootLeft:
self.x -= self.bullet_speed
self.rect.x = self.x
class Asteroid(Sprite):
""" a class that represents a single asteroid """
def __init__(self,game):
""" initialize the asteroid and set its starting position """
super().__init__()
self.screen = game.screen
self.speed = 0.25
self.direction = 1
#load the asteroid image onto the screen
self.image = pygame.image.load('images/asteroid.bmp')
self.rect = self.image.get_rect()
#start each new asteroid in a random part just outside the map on either the left or right
self.rect.x = random.randint(*random.choice([(0,0),(1160,1160)]))
self.rect.y = random.randint(0,760)
#store the asteroid's exact horizontal positon
self.x = float(self.rect.x)
self.y = float(self.rect.y)
def update(self):
""" move the asteroid to the right or left """
self.x += self.speed * self.direction
self.rect.x = self.x
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