import sys from time import sleep import pygame from settings import Settings from game_stats import GameStats from scoreboard import Scoreboard from button import Button from ship import Ship from bullet import Bullet from alien import Alien class AlienInvasion: """Overall class to manage game assets and behavior.""" def __init__(self): """Initialize the game, and create game resources.""" pygame.init() self.settings = Settings() self.screen = pygame.display.set_mode((0, 0), pygame.FULLSCREEN) self.settings.screen_width = self.screen.get_rect().width self.settings.screen_height = self.screen.get_rect().height pygame.display.set_caption("Alien Invasion") # Create an instance to store game statistics, # and create a scoreboard. self.stats = GameStats(self) self.sb = Scoreboard(self) self.ship = Ship(self) self.bullets = pygame.sprite.Group() self.aliens = pygame.sprite.Group() self._create_fleet() # Make the Play button. self.play_button = Button(self, "Play") def run_game(self): """Start the main loop for the game.""" while True: self._check_events() #COMPLETE #Make this code run only if self.stats.game_active is True if self.stats.game_active: self.ship.update() self._update_bullets() self._update_aliens() self._update_screen() def _check_events(self): """Respond to keypresses and mouse events.""" for event in pygame.event.get(): #COMPLETE #make this code run event.type is pygame.QUIT sys.exit() #make this code run event.type is pygame.KEYDOWN self._check_keydown_events(event) #make this code run event.type is pygame.KEYUP self._check_keyup_events(event) #make this code run event.type is pygame.MOUSEBOTTOMDOWN mouse_pos = pygame.mouse.get_pos() self._check_play_button(mouse_pos) def _check_play_button(self, mouse_pos): """Start a new game when the player clicks Play.""" #COMPLETE button_clicked = self.play_button.rect.collidepoint(mouse_pos) #make this code run if button_clicked is True and self.stats.game_active is False #Reset the game settings. self.settings.initialize_dynamic_settings() # Reset the game statistics. self.stats.reset_stats() self.stats.game_active = True self.sb.prep_score() self.sb.prep_level() self.sb.prep_ships() # Get rid of any remaining aliens and bullets. self.aliens.empty() self.bullets.empty() # Create a new fleet and center the ship. self._create_fleet() self.ship.center_ship() # Hide the mouse cursor. pygame.mouse.set_visible(False) def _check_keydown_events(self, event): """Respond to keypresses.""" #COMPLETE #make this code run when event.key is pygame.K_RIGHT self.ship.moving_right = True #make this code run when event.key is pygame.K_LEFT self.ship.moving_left = True #make this code run when event.key is pygame.K_q sys.exit() #make this code run when event.key is pygame.K_SPACE self._fire_bullet() def _check_keyup_events(self, event): """Respond to key releases.""" #COMPLETE #write code so that when event.key is pygame.K_RIGHT self.ship.moving is set to False #else if event.key is pygame.K_LEFT self.ship.moving is set to True def _fire_bullet(self): """Create a new bullet and add it to the bullets group.""" #COMPLETE #make this code run if len(self.bullets) is less than self.settings.bullets_allowed new_bullet = Bullet(self) self.bullets.add(new_bullet) def _update_bullets(self): """Update position of bullets and get rid of old bullets.""" #Update bullet positions. self.bullets.update() #Get rid of bullets that have disappeared. for bullet in self.bullets.copy(): #COMPLETE #Make this code run if bullet.rect.bottom is less than or equal to 0 self.bullets.remove(bullet) self._check_bullet_alien_collisions() def _check_bullet_alien_collisions(self): """Respond to bullet-alien collisions.""" # Remove any bullets and aliens that have collided. collisions = pygame.sprite.groupcollide( self.bullets, self.aliens, True, True) #COMPLETE # Make this code happen when collisions is True for aliens in collisions.values(): self.stats.score += self.settings.alien_points * len(aliens) self.sb.prep_score() self.sb.check_high_score() #COMPLETE # Make this code happen when self.aliens is False #Destroy existing bullets and create new fleet. self.bullets.empty() self._create_fleet() self.settings.increase_speed() # Increase level. self.stats.level += 1 self.sb.prep_level() def _update_aliens(self): """ Check if the fleet is at an edge, then update the positions of all aliens in the fleet. """ self._check_fleet_edges() self.aliens.update() # Look for alien-ship collisions. if pygame.sprite.spritecollideany(self.ship, self.aliens): self._ship_hit() # Look for aliens hitting the bottom of the screen. self._check_aliens_bottom() def _check_aliens_bottom(self): """Check if any aliens have reached the bottom of the screen.""" screen_rect = self.screen.get_rect() for alien in self.aliens.sprites(): #COMPLETE # Make this code happen when alien.rect.bottom is greater than or equal to screen_rect.bottom # Treat this the same as if the ship got hit. self._ship_hit() break def _ship_hit(self): """Respond to the ship being hit by an alien.""" #COMPLETE # Make this code happen if self.stats.ships_left is greater than 0 #Decrement ships_left, and update scoreboard. self.stats.ships_left -= 1 self.sb.prep_ships() # Get rid of any remaining aliens and bullets. self.aliens.empty() self.bullets.empty() # Create a new fleet and center the ship. self._create_fleet() self.ship.center_ship() # Pause. sleep(0.5) else: #COMPLETE # set self.stats.game_active to False pygame.mouse.set_visible(True) def _create_fleet(self): """Create the fleet of aliens.""" # Create an alien and find the number of aliens in a row. # Spacing between each alien is equal to one alien width. alien = Alien(self) alien_width, alien_height = alien.rect.size available_space_x = self.settings.screen_width - (2 * alien_width) number_aliens_x = available_space_x // (2 * alien_width) # Determine the number of rows of aliens that fit on the screen. ship_height = self.ship.rect.height available_space_y = (self.settings.screen_height - (3 * alien_height) - ship_height) number_rows = available_space_y // (2 * alien_height) # Create the full fleet of aliens. for row_number in range(number_rows): for alien_number in range(number_aliens_x): self._create_alien(alien_number, row_number) def _create_alien(self, alien_number, row_number): """Create an alien and place it in the row.""" alien = Alien(self) alien_width, alien_height = alien.rect.size alien.x = alien_width + 2 * alien_width * alien_number #COMPLETE # Set alien.rect.x to alien.x alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number self.aliens.add(alien) def _check_fleet_edges(self): """Respond appropriately if any aliens have reached an edge.""" for alien in self.aliens.sprites(): if alien.check_edges(): self._change_fleet_direction() break def _change_fleet_direction(self): """Drop the entire fleet and change the fleet's direction.""" for alien in self.aliens.sprites(): alien.rect.y += self.settings.fleet_drop_speed self.settings.fleet_direction *= -1 def _update_screen(self): """Update images on the screen, and flip to the new screen.""" self.screen.fill(self.settings.bg_color) self.ship.blitme() for bullet in self.bullets.sprites(): bullet.draw_bullet() self.aliens.draw(self.screen) # Draw the score information. self.sb.show_score() # Draw the play button if the game is inactive. if not self.stats.game_active: self.play_button.draw_button() pygame.display.flip() if __name__ == '__main__': # Make a game instance, and run the game. ai = AlienInvasion() ai.run_game()