42 lines
1.5 KiB
Python
42 lines
1.5 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值"""
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super(Ship, self).__init__()
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self.screen = screen
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self.ai_seetings = ai_settings
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# 加载飞船图像并获取其外接矩形
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self.image = pygame.image.load("./images/ship.bmp")
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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.center = float(self.rect.centerx)
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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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def update(self):
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"""根据移动标志调整飞船的位置"""
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# 更新飞船呢的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.center += self.ai_seetings.ship_speed_factor
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if self.moving_left and self.rect.left > 0:
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self.center -= self.ai_seetings.ship_speed_factor
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# 根据self.center更新rect的对象
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self.rect.centerx = self.center
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def blitme(self):
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"""在指定位置绘制飞船"""
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self.screen.blit(self.image, self.rect)
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def center_ship(self):
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"""让飞船在屏幕中央"""
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self.center = self.screen_rect.centerx |