ship.py

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().__init__()
        self.screen = screen
        self.ai_settings = ai_settings

        # Load the ship image and get its rect.
        self.image = pygame.image.load('images/mega-ball.png')
        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

        # Movement flag.
        self.moving_right = False
        self.moving_left = False
        # self.moving_up = False
        # self.moving_down = False

        # Store a decimal value for the ship's center.
        self.center_x = float(self.rect.centerx)
        # self.center_y = float(self.rect.centery)

    def update(self):
        """Update the ship's position based on the movement flag."""
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.center_x += self.ai_settings.ship_speed_factor
        if self.moving_left and self.rect.left > 0:
            self.center_x -= self.ai_settings.ship_speed_factor
        """
        if self.moving_up and self.rect.top > 0:
            self.center_y -= self.ai_settings.ship_speed_factor
        if self.moving_down and self.rect.bottom < self.screen_rect.bottom:
            self.center_y += self.ai_settings.ship_speed_factor
        """
        # Update rect object from self.center.
        self.rect.centerx = self.center_x
        # self.rect.centery = self.center_y

    def center_ship(self):
        """Center the ship on the screen."""
        self.center = self.screen_rect.centerx

    def blitme(self):
        """Draw the ship at its current location."""
        self.screen.blit(self.image, self.rect)