56 lines
1.9 KiB
Python
56 lines
1.9 KiB
Python
# 创建飞船Ship类
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import pygame
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from pygame.sprite import Sprite
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class Ship(Sprite):
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"""
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初始化飞船并设置其初始位置
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"""
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def __init__(self, ai_settings, screen):
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super().__init__()
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self.screen = screen
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self.ai_settings = 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() # 获取飞船图片外接矩形（即是让其可以像矩形一样被处理）
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self.screen_rect = self.screen.get_rect() # 获取屏幕图片外接矩形（即是让其可以像矩形一样被处理）
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# 将每搜新飞船放在屏幕底部中央
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self.rect.centerx = self.screen_rect.centerx # 将飞船的centerx与屏幕的centerx捆绑在一起
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self.rect.bottom = self.screen_rect.bottom # 将飞船的bottom与屏幕的bottom捆绑在一起
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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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# 飞船水平移动标志
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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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"""
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根据移动标志调整飞船水平位置
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"""
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# 飞船持续向右移动
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if self.moving_right and self.rect.right < self.screen_rect.right:
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self.center += self.ai_settings.ship_speed_factor
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# 飞船持续向左移动
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if self.moving_left and self.rect.left > 0:
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self.center -= self.ai_settings.ship_speed_factor
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# 根据self.center更新image_rect对象
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self.rect.centerx = self.center
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def blitem(self):
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"""
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在指定位置绘制飞船
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"""
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self.screen.blit(self.image, self.rect)
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def center_ship(self):
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"""让飞船在屏幕底部居中"""
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self.ship_center = self.screen_rect.centerx
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