80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
import pygame
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from pygame.sprite import Sprite
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class Bullet(Sprite):
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"""一个对飞船发射的子弹进行管理的类"""
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def __init__(self, ai_settings, screen, ship):
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"""在飞船所处的位置创建一个子弹对象"""
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super(Bullet, self).__init__()
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self.screen = screen
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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, ai_settings.bullet_width,
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ai_settings.bullet_height)
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self.rect.centerx = ship.rect.centerx
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self.rect.top = ship.rect.top
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# 存储用小数表示的子弹位置
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self.y = float(self.rect.y)
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self.color = ai_settings.bullet_color
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self.speed_factor = ai_settings.bullet_speed_factor
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def update(self):
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"""向上移动子弹"""
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# 更新表示子弹位置的小数值
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self.y -= self.speed_factor
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# 更新表示子弹的rect的位置
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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)
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class BossBullet(Sprite):
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"""Boss发射的子弹"""
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def __init__(self, ai_settings, screen, bossalien):
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"""在飞船所处的位置创建一个子弹对象"""
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super(BossBullet, self).__init__()
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self.screen = screen
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# 在boss底部中央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, ai_settings.bossbullet_width,
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ai_settings.bossbullet_height)
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self.rect.x = bossalien.x
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self.rect.y = bossalien.rect.bottom
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self.width = ai_settings.bossbullet_width
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self.height = ai_settings.bossbullet_height
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# 存储用小数表示的子弹位置
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self.y = float(self.rect.y)
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self.y = bossalien.rect.bottom
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self.x = bossalien.x
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self.color = ai_settings.bossbullet_color
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self.speed_factor = ai_settings.bossbullet_speed_factor
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def update(self):
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"""向下移动子弹"""
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# 更新表示子弹位置的小数值
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self.y += self.speed_factor
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# 更新表示子弹的rect的位置
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self.rect.y = self.y
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def reset_position(self, bossalien):
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"""（当子弹飞出屏幕底部或者击中飞船时）回到开始的地方"""
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self.y = bossalien.rect.bottom
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self.x = bossalien.x
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# 更新rect位置
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self.rect.y = self.y
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self.rect.x = self.x
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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.x, self.y), (self.width, self.height)))
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