game_functions.py

import sys
import pygame
import pygame.mixer

from bullet import Bullet
from alien import Alien
from time import sleep

def start_game(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets):
        #Hide the mouse cursor.
        pygame.mixer.music.stop()
        #shooting_sound = pygame.mixer.Sound("music/Ghost_Chase_Thriller.mp3")
        #pygame.mixer.Sound.play("music/Ghost_Chase_Thriller.mp3")

        #pygame.mixer.music.load('music/Action_Time.mp3')
        #pygame.mixer.music.play(-1)

        pygame.mouse.set_visible(False)
        # Reset the game statistics.
        stats.reset_stats()
        stats.game_active = True

        # Reset the scoreboard images.
        sb.prep_images()

        # Empty the list of aliens and bullets.
        aliens.empty()
        bullets.empty()

        # Create a new fleet and center the ship.
        create_fleet(ai_settings, screen, ship, aliens)
        ship.center_ship()

def check_keydown_events(event, ai_settings, screen, stats, ship, bullets):
    """Respond to keypresses."""
    if event.key == pygame.K_RIGHT:
        ship.moving_right = True
    elif event.key == pygame.K_LEFT:
        ship.moving_left = True
    elif event.key == pygame.K_SPACE:
        pygame.mixer.music.load('music/Crash_Metal_Sweetener_Distant.mp3')
        pygame.mixer.music.play(0)

        fire_bullets(ai_settings, screen, ship, bullets)
        #pygame.mixer.Sound.play("music/Ghost_Chase_Thriller.mp3")
        
    elif event.key == pygame.K_q:
        update_high_score(stats)
        sys.exit()

def update_high_score(stats):
    file = open("highest_score.txt", "w")
    file.write(str(stats.high_score))
    file.close()

def fire_bullets(ai_settings, screen, ship, bullets):
    # Create a new bullet and add it to the bullets group.
    if len(bullets) < ai_settings.bullets_allowed:
        new_bullet = Bullet(ai_settings, screen, ship)
        bullets.add(new_bullet)

def check_keyup_events(event, ship):
    """Respond to key releases."""
    if event.key == pygame.K_RIGHT:
        ship.moving_right = False
    elif event.key == pygame.K_LEFT:
        ship.moving_left = False


def check_events(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets):
    """Respond to keypresses and mouse events."""
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            update_high_score(stats)
            sys.exit()

        elif event.type == pygame.KEYDOWN:
            check_keydown_events(event, ai_settings, screen, stats, ship, bullets)
            if event.key == pygame.K_p and not stats.game_active:
                start_game(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets)

        elif event.type == pygame.KEYUP:
            check_keyup_events(event, ship)

        elif event.type == pygame.MOUSEBUTTONDOWN:
            mouse_x, mouse_y = pygame.mouse.get_pos()
            check_play_button(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets, mouse_x, mouse_y)

def check_play_button(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets, mouse_x, mouse_y):
    """Start a new game when the player clicks play"""
    button_clicked = play_button.rect.collidepoint(mouse_x, mouse_y)
    if button_clicked and not stats.game_active:
        # Reset the game settings.
        ai_settings.initialize_dynamic_settings()
        start_game(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets)

def get_number_aliens_x(ai_settings, alien_width):
    """Determine the number of aliens that fit in a row."""
    available_space_x = ai_settings.screen_width - 2*alien_width
    number_aliens_x = int(available_space_x / (2*alien_width))
    return number_aliens_x

def get_number_rows(ai_settings, ship_height, alien_height):
    """Determine the number of rows of aliens that fit on the screen."""
    available_space_y = ai_settings.screen_height - 5*alien_height - ship_height
    number_rows = int(available_space_y / (2*alien_height))
    return number_rows

def create_alien(ai_settings, screen, aliens, alien_number, row_number):
    # Create an alien and place it in the row.
    alien = Alien(ai_settings, screen)
    alien_width = alien.rect.width
    alien.x = alien_width + 2*alien_width*alien_number + 50
    alien.rect.x = alien.x
    alien.rect.y = 2*alien.rect.height + 2*alien.rect.height*row_number
    aliens.add(alien)

def create_fleet(ai_settings, screen, ship, aliens):
    """Create a full fleet of aliens."""
    # Create an alien and find the number of aliens in a row.
    alien = Alien(ai_settings, screen)
    number_aliens_x = get_number_aliens_x(ai_settings, alien.rect.width)
    number_rows = get_number_rows(ai_settings, ship.rect.height, alien.rect.height)

    # Create the fleet of aliens.
    for row_number in range(number_rows):
        for alien_number in range(number_aliens_x):
            create_alien(ai_settings, screen, aliens, alien_number, row_number)

def check_fleet_edges(ai_settings, aliens):
    """Respond appropriately if any aliens have reached an edge."""
    for alien in aliens.sprites():
        if alien.check_edges():
            change_fleet_direction(ai_settings, aliens)
            break

def change_fleet_direction(ai_settings, aliens):
    """Drop the entire fleet and change the fleet's direction."""
    for alien in aliens.sprites():
        alien.rect.y += ai_settings.fleet_drop_speed
    ai_settings.fleet_direction *= -1

def ship_hit(ai_settings, stats, sb, screen, ship, aliens, bullets):
    """Respond to ship being hit by alien."""
    if stats.ships_left > 0:
        # Decrement ships_left
        stats.ships_left -= 1

        # Update scoreboard.
        sb.prep_ships()

        # Empty the list of aliens and bullets.
        aliens.empty()
        bullets.empty()

        # Create a new fleet and center the ship.
        create_fleet(ai_settings, screen, ship, aliens)
        ship.center_ship()

        # Pause
        sleep(0.5)
    else:
        stats.game_active = False
        pygame.mouse.set_visible(True)

def check_aliens_bottom(ai_settings, stats, screen, ship, aliens, bullets):
    """Check if any aliens have reached the bottom of the screen."""
    screen_rect = screen.get_rect()
    for alien in aliens.sprites():
        if alien.rect.bottom >= screen_rect.bottom:
            # Treat this same as if the ship got hit.
            pygame.mixer.music.stop()
            pygame.mixer.music.load('music/Crash.mp3')
            pygame.mixer.music.play(0)

            ship_hit(ai_settings, stats, sb, screen, ship, aliens, bullets)
            break

def update_aliens(ai_settings, stats, screen, sb, ship, aliens, bullets):
    """
    Check if the fleet is at an edge
    and then update the position of all aliens in the fleet.
    """
    check_fleet_edges(ai_settings, aliens)
    aliens.update()

    # Look for alien-ship collisions.
    if pygame.sprite.spritecollideany(ship, aliens):
        pygame.mixer.music.stop()
        pygame.mixer.music.load('music/Crash.mp3')
        pygame.mixer.music.play(0)
        ship_hit(ai_settings, stats, sb, screen, ship, aliens, bullets)

    # Look for aliens hitting the bottom of the screen.
    check_aliens_bottom(ai_settings, stats, screen, ship, aliens, bullets)

def update_level(ai_settings, screen, stats, sb, ship, aliens, bullets):
    if len(aliens) == 0:
        # Destroy existing bullets, apeed up game, and create new fleet.
        bullets.empty()
        ai_settings.increase_speed()

        pygame.mixer.music.load('music/Beep_Short.mp3')
        pygame.mixer.music.play(0)

        # Increase level
        stats.level += 1
        sb.prep_level()

        create_fleet(ai_settings, screen, ship, aliens)

def update_score(ai_settings, stats, sb, aliens, collisions):
    for aliens in collisions.values():
        stats.score += ai_settings.alien_points * len(aliens)
        sb.prep_score()
    check_high_score(stats, sb)

def check_bullet_alien_collisions(ai_settings, screen, stats, sb, ship, aliens, bullets):
    """Respond to bullet-alien collision."""
    # Remove any bullets and aliens that have collided.
    collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)
    if collisions:
        
        update_score(ai_settings, stats, sb, aliens, collisions)
    update_level(ai_settings, screen, stats, sb, ship, aliens, bullets)

def update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets):
    """Update position of bullets and get rid of old bullets."""
    # Update bullet position.
    bullets.update()

    # Get rid of bullets that have disappeared.
    for bullet in bullets.copy():
        if bullet.rect.bottom <= 0:
            bullets.remove(bullet)

    check_bullet_alien_collisions(ai_settings, screen, stats, sb, ship, aliens, bullets)

def check_high_score(stats, sb):
    """Check to see if there's new high score."""
    if stats.score > stats.high_score:
        stats.high_score = stats.score
        sb.prep_high_score()

def update_screen(ai_settings, screen, stats, sb, ship, aliens, bullets, play_button):
    # Redraw the screen during each pass through the loop.
    #screen.fill(ai_settings.bg_color)

    # Redraw all bullets behind ship and aliens.
    for bullet in bullets.sprites():
        bullet.draw_bullet()

    ship.blitme()
    aliens.draw(screen)

    # Draw the score information.
    sb.show_score()

    # Draw the play button if the game is inactive.
    if not stats.game_active:
        play_button.draw_button()

    # Make the most recently drawn screen visible.
    pygame.display.flip()
    pygame.display.update()