51 lines
1.8 KiB
Python
51 lines
1.8 KiB
Python
import pygame
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from pygame.sprite import Sprite
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class Ship(Sprite):
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def __init__(self, ai_settings, screen):
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"""初始化飞船并设置其初始位置"""
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super(Ship, self).__init__()
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self.screen = screen
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self.ai_settings = ai_settings
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self.image = pygame.image.load('images/ship.png')
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self.rect = self.image.get_rect()
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self.screen_rect = screen.get_rect()
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# 将每艘新飞船放在屏幕底部中央
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self.rect.centerx = self.screen_rect.centerx
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self.rect.bottom = self.screen_rect.bottom
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# 在飞船的属性center中存储小数值
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self.centerx = float(self.rect.centerx)
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self.centery = float(self.rect.centery)
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# 移动标志
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self.moving_right = False
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self.moving_left = False
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self.moving_up = False
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self.moving_down = False
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def update(self):
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"""根据移动标志调整飞船的位置"""
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# 更新飞船的center值，而不是rect
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if self.moving_right and self.rect.right < self.screen_rect.right:
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self.centerx += self.ai_settings.ship_speed_factor
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if self.moving_left and self.rect.left > 0:
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self.centerx -= self.ai_settings.ship_speed_factor
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if self.moving_up and self.rect.top > 0:
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self.centery -= self.ai_settings.ship_speed_factor
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if self.moving_down and self.rect.bottom < self.screen_rect.bottom:
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self.centery += self.ai_settings.ship_speed_factor
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# 根据self.center更新rect对象
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self.rect.centerx = self.centerx
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self.rect.centery = self.centery
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def blitme(self):
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self.screen.blit(self.image, self.rect)
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def center_ship(self):
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"""让飞船在屏幕上居中"""
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self.center = self.screen_rect.centerx
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