上传文件至 ''

ship.py

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+import pygame
+from pygame.sprite import Sprite
+
+
+class Ship(Sprite):
+
+    def __init__(self, ai_settings, screen):
+        """Initialize the ship, and set its starting position."""
+        super(Ship, self).__init__()
+        self.screen = screen
+        self.ai_settings = ai_settings
+
+        # Load the ship image, and get its rect.
+        self.image = pygame.image.load(r'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.bottom = self.screen_rect.bottom
+
+        # Store a decimal value for the ship's center.
+        self.center = float(self.rect.centerx)
+
+        # Movement flags.
+        self.moving_right = False
+        self.moving_left = False
+
+    def center_ship(self):
+        """Center the ship on the screen."""
+        self.center = self.screen_rect.centerx
+
+    def update(self):
+        """Update the ship's position, based on movement flags."""
+        # Update the ship's center value, not the rect.
+        if self.moving_right and self.rect.right < self.screen_rect.right:
+            self.center += self.ai_settings.ship_speed_factor
+        if self.moving_left and self.rect.left > 0:
+            self.center -= self.ai_settings.ship_speed_factor
+
+        # Update rect object from self.center.
+        self.rect.centerx = self.center
+
+    def blitme(self):
+        """Draw the ship at its current location."""
+        self.screen.blit(self.image, self.rect)