ship.py

#! python3
# ship.py: To manage behaviour of player's ship

import pygame
from pygame.sprite import Sprite


class Ship(Sprite):
    """A class to manage the ship"""

    def __init__(self, ai_game) -> None:
        """Initialize the ship and set its starting position"""
        super().__init__()
        self.screen = ai_game.screen
        self.screen_rect = ai_game.screen.get_rect()
        self.settings = ai_game.settings

        # Load ship image and get its rect
        self.image = pygame.image.load("images/ship.bmp")
        self.rect = self.image.get_rect()

        # Start each new ship at the bottom center of the screen.
        self.rect.midbottom = self.screen_rect.midbottom

        # Store a decimal value for the ship's horizontal position
        self.x = float(self.rect.x)

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

    def center_ship(self):
        """Center the ship on screen"""
        self.rect.midbottom = self.screen_rect.midbottom
        self.x = float(self.rect.x)

    def update(self):
        """Update the ship's position based on movement flag"""
        # Update the ship's x value not the rect
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.x += self.settings.ship_speed
        if self.moving_left and self.rect.left > 0:
            self.x -= self.settings.ship_speed

        # Update rect object
        self.rect.x = self.x  # will store the integer part

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