46 lines
1.6 KiB
Python
46 lines
1.6 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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"""Initialize the ship, and set its starting position."""
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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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# Load the ship image, and get its rect.
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self.image = pygame.image.load(r'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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# Start each new ship at the bottom center of the screen.
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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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# Store a decimal value for the ship's center.
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self.center = float(self.rect.centerx)
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# Movement flags.
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self.moving_right = False
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self.moving_left = False
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def center_ship(self):
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"""Center the ship on the screen."""
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self.center = self.screen_rect.centerx
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def update(self):
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"""Update the ship's position, based on movement flags."""
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# Update the ship's center value, not the 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_settings.ship_speed_factor
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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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# Update rect object from self.center.
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self.rect.centerx = self.center
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def blitme(self):
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"""Draw the ship at its current location."""
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self.screen.blit(self.image, self.rect)
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