alien_invasion.py

import sys

import pygame

from settings import Settings
from ship import Ship
from character import Character
from bullet import Bullet
from alien import Alien

class AlienInvasion:
    """General class to manage the behaviour and resources of the game"""
    def __init__(self):
        """Initializes the game and creates resources"""
        pygame.init()
        self.clock = pygame.time.Clock()
        self.settings = Settings()

        self.screen = pygame.display.set_mode((0,0),pygame.FULLSCREEN)
        pygame.display.set_caption("Alien invasion")

        self.ship = Ship(self)
        # self.character = Character(self)

        self.bg_color = (230,230,230)

        self.bullets = pygame.sprite.Group()
        self.aliens = pygame.sprite.Group()

        self._create_fleet()

    def run_game(self):
        """Inicia el bucle principal para el juego"""
        while True:
            self._check_events()
            self._update_screen()
            self._update_bullets()

            self.clock.tick(60)

    def _update_bullets(self):
        for bullet in self.bullets.copy():
            if bullet.rect.bottom <= 0:
                self.bullets.remove(bullet)
        print (len(self.bullets))

    def _check_events(self):
        """Responds to keystrokes and mice events"""
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            
            elif event.type == pygame.KEYDOWN:
                self._check_keydown_events(event)
            elif event.type == pygame.KEYUP:
                self._check_keyup_events(event)

    def _check_keydown_events(self, event):
        """Respond to key pushes"""
        if event.key == pygame.K_RIGHT:
            self.ship.rect.x += 20
            self.ship.moving_right = True
        elif event.key == pygame.K_LEFT:
            self.ship.rect.x -= 20
            self.ship.moving_left = True
        elif event.key == pygame.K_q:
            sys.exit()
        elif event.key == pygame.K_SPACE:
            self._fire_bullet()

    def _check_keyup_events(self, event):
        if event.key == pygame.K_RIGHT:
            self.ship.moving_right = False
        elif event.key == pygame.K_LEFT:
            self.ship.moving_left = False

    def _fire_bullet(self):
        """Creates a new bullet and adds it to the group of bullets"""
        if len(self.bullets) < self.settings.bullets_allowed:
            new_bullet = Bullet(self)
            self.bullets.add(new_bullet)

    def _update_screen(self):
        self.screen.fill(self.settings.bg_color)
        for bullet in self.bullets.sprites():
            bullet.draw_bullet()
        self.ship.update()
        self.bullets.update()
        self.ship.blitme()
        self.aliens.draw(self.screen)
        # self.character.blitme()

        pygame.display.flip()

    def _create_alien(self, x_position, y_position):
        """Creates an alien and puts it within the row"""
        new_alien = Alien(self)
        new_alien.x = x_position
        new_alien.rect.x = x_position
        new_alien.y = y_position
        new_alien.rect.y = y_position
        self.aliens.add(new_alien)

    def _create_fleet(self):
        """Creates fleet of aliens"""
        # Creates an alien
        alien = Alien(self)
        alien_width, alien_height = alien.rect.size

        current_x, current_y = alien_width, alien_height
        while current_y < (self.settings.screen_height - 3 * alien_height):
            while current_x < (self.settings.screen_width - 2 * alien_width):
                self._create_alien(current_x, current_y)
                current_x += 2 * alien_width
            # finished row, next column
            current_x = alien_width
            current_y += 2 * alien_height

        self.aliens.add(alien)

if __name__ == '__main__':
    ai = AlienInvasion()
    ai.run_game()