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12-3
import pygame
class Ship():
?? ?def __init__(self, ai_settings, screen):
?? ??? ?''' Initialize the ship and set its starting position.'''
?? ??? ?self.screen=screen
?? ??? ?self.ai_settings = ai_settings
?? ??? ?# Load the ship image and get its rect.
?? ??? ?self.image = pygame.image.load('images/ship.bmp')
?? ??? ?self.rect = self.image.get_rect()
?? ??? ?self.screen_rect = screen.get_rect()
?? ??? ?# Start each new ship at the bottom center of the screen.
?? ??? ?self.rect.centerx = self.screen_rect.centerx
?? ??? ?self.rect.centery = self.screen_rect.centery
?? ??? ?# Store a decimal value for the ship's center.
?? ??? ?self.centerx = float(self.rect.centerx)
?? ??? ?self.centery = float(self.rect.centery)
?? ??? ?# Movement flags
?? ??? ?self.moving_right = False
?? ??? ?self.moving_left = False
?? ??? ?self.moving_up = False
?? ??? ?self.moving_down = False
?? ?def update(self):
?? ??? ?''' Update the ship's position based on the movement flags.'''
?? ??? ?# Update the ship's center value, not the rect.
?? ??? ?if self.moving_right and self.rect.right < self.screen_rect.right:
?? ??? ??? ?self.centerx += self.ai_settings.ship_speed_factor
?? ??? ?if self.moving_left and self.rect.left > 0:
?? ??? ??? ?self.centerx -= self.ai_settings.ship_speed_factor
?? ??? ?if self.moving_down and self.rect.bottom < self.screen_rect.bottom:
?? ??? ??? ?self.centery += self.ai_settings.ship_speed_factor
?? ??? ?if self.moving_up and self.rect.top > 0:
?? ??? ??? ?self.centery -= self.ai_settings.ship_speed_factor
?? ??? ?# Update rect object from self.center.
?? ??? ?self.rect.centerx = self.centerx
?? ??? ?self.rect.centery = self.centery
?? ?def blitme(self):
?? ??? ?''' Draw the ship at its current location.'''
?? ??? ?self.screen.blit(self.image, self.rect)
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