30 lines
1009 B
Python
30 lines
1009 B
Python
import pygame
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from pygame.sprite import Sprite
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class Bullet(Sprite):
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#管理飞船所发射子弹的类
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def __init__(self, ai_game):
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#在飞船当前位置创建一个子弹对象
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super().__init__()
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self.screen = ai_game.screen
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self.settings = ai_game.settings
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self.color = self.settings.bullet_color
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# 在（0，0）处创建一个表示子弹的矩形，再设置正确的位置
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self.rect = pygame.Rect(0, 0, self.settings.bullet_width,
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self.settings.bullet_height)
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self.rect.midtop = ai_game.ship.rect.midtop
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# 储存用小数表示的子弹位置
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self.y = float(self.rect.y)
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def update(self):
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# 更新表示子弹位置的小数值
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self.y -= self.settings.bullet_speed
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#更新表示子弹的rect位置
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self.rect.y = self.y
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def draw_bullet(self):
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#在屏幕上绘制子弹
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pygame.draw.rect(self.screen, self.color, self.rect) |