261 lines
8.4 KiB
Python
261 lines
8.4 KiB
Python
import sys
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from time import sleep
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import pygame
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from bullet import Bullet
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from alien import Alien
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def check_keydown_events(event, ai_settings, screen, ship, bullets):
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"""响应按键"""
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if event.key == pygame.K_RIGHT:
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ship.moving_right = True
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elif event.key == pygame.K_LEFT:
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ship.moving_left = True
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elif event.key == pygame.K_UP:
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ship.moving_up = True
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elif event.key == pygame.K_DOWN:
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ship.moving_down = True
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elif event.key == pygame.K_SPACE:
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fire_bullet(ai_settings, screen, ship, bullets)
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elif event.key == pygame.K_q:
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sys.exit()
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def fire_bullet(ai_settings, screen, ship, bullets):
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"""如果还没有到达限制，就发射一颗子弹"""
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# 创建一颗子弹，并将其加入到编组bullets中
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if len(bullets) < ai_settings.bullets_allowed:
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new_bullet = Bullet(ai_settings, screen, ship)
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bullets.add(new_bullet)
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def check_keyup_events(event, ship):
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"""响应松开"""
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if event.key == pygame.K_RIGHT:
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ship.moving_right = False
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elif event.key == pygame.K_LEFT:
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ship.moving_left = False
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elif event.key == pygame.K_UP:
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ship.moving_up = False
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elif event.key == pygame.K_DOWN:
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ship.moving_down = False
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def check_events(ai_settings, screen, stats, sb, play_button, ship, aliens,
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bullets):
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"""响应按键和鼠标事件"""
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for event in pygame.event.get():
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if event.type == pygame.QUIT:
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sys.exit()
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elif event.type == pygame.KEYDOWN:
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check_keydown_events(event, ai_settings, screen, ship, bullets)
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elif event.type == pygame.KEYUP:
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check_keyup_events(event, ship)
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elif event.type == pygame.MOUSEBUTTONDOWN:
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mouse_x, mouse_y = pygame.mouse.get_pos()
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check_play_button(ai_settings, screen, stats, sb, play_button, ship,
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aliens, bullets, mouse_x, mouse_y )
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def check_play_button(ai_settings, screen, stats, sb, play_button, ship, aliens,
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bullets, mouse_x, mouse_y):
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"""在玩家单击Play按钮时开始新游戏"""
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button_clicked = play_button.rect.collidepoint(mouse_x, mouse_y)
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if button_clicked and not stats.game_active:
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# 重置游戏设置
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ai_settings.initialize_dynamic_settings()
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# 隐藏光标
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pygame.mouse.set_visible(False)
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# 重置游戏统计信息
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stats.reset_stats()
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stats.game_active = True
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# 重置记分牌图像
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sb.prep_score()
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sb.prep_high_score()
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sb.prep_level()
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sb.prep_ships()
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# 清空外星人列表和子弹列表
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aliens.empty()
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bullets.empty()
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# 创建一群新的外星人，并让飞船居中
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create_fleet(ai_settings, screen, ship, aliens)
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ship.center_ship()
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def update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets):
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"""更新子弹的位置，并删除已消失的子弹"""
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# 更新子弹的位置
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bullets.update()
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# 删除已消失的子弹
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for bullet in bullets.copy():
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if bullet.rect.bottom <= 0:
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bullets.remove(bullet)
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check_bullet_alien_collisions(ai_settings, screen, stats, sb, ship,
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aliens, bullets)
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def check_bullet_alien_collisions(ai_settings, screen, stats, sb, ship,
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aliens, bullets):
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"""响应子弹和外星人的碰撞"""
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# 删除发生碰撞的子弹和外星人
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collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)
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if collisions:
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for aliens in collisions.values():
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stats.score += ai_settings.alien_points * len(aliens)
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sb.prep_score()
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check_high_score(stats, sb)
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if len(aliens) == 0:
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# 如果整群外星人都被消灭，就提高一个等级
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bullets.empty()
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ai_settings.increase_speed()
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# 提高等级
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stats.level += 1
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sb.prep_level()
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create_fleet(ai_settings, screen, ship, aliens)
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def update_screen(ai_settings, screen, stats, sb, ship, aliens, bullets,
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play_button):
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"""更新屏幕上的图像，并切换到新屏幕"""
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# 每次循环时都重绘屏幕
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# 背景图片
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bg_image = pygame.image.load('images/111.bmp')
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screen.blit(bg_image, (0, 0))
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# 在飞船和外星人后面重绘所有子弹
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for bullet in bullets.sprites():
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bullet.draw_bullet()
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ship.blitme()
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aliens.draw(screen)
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# 显示得分
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sb.show_score()
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# 如果游戏处于非活动状态，就绘制Play按钮
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if not stats.game_active:
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play_button.draw_button()
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# 让最近绘制的屏幕可见
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pygame.display.flip()
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def get_number_aliens_x(ai_settings, alien_width):
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"""计算每行可容纳多少个外星人"""
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available_space_x = ai_settings.screen_width - 2 * alien_width
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number_aliens_x = int(available_space_x / (2 * alien_width))
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return number_aliens_x
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def get_number_rows(ai_settings, ship_height, alien_height):
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"""计算屏幕可容纳多少行外星人"""
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available_space_y = (ai_settings.screen_height -
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(3 * alien_height) - ship_height)
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number_rows = int(available_space_y / (3 * alien_height))
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return number_rows
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def create_alien(ai_settings, screen, aliens, alien_number, row_number):
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"""创建一个外星人并将其放在当前行"""
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alien = Alien(ai_settings, screen)
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alien_width = alien.rect.width
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alien.x = alien_width + 2 * alien_width * alien_number
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alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number
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alien.rect.x = alien.x
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aliens.add(alien)
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def create_fleet(ai_settings, screen, ship, aliens):
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"""创建外星人群"""
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# 创建一个外星人，并计算每行可容纳多少个外星人
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alien = Alien(ai_settings, screen)
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number_aliens_x = get_number_aliens_x(ai_settings, alien.rect.width)
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number_rows = get_number_rows(ai_settings, ship.rect.height,
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alien.rect.height)
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# 创建外星人群
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for row_number in range(number_rows):
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for alien_number in range(number_aliens_x):
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create_alien(ai_settings, screen, aliens, alien_number,
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row_number)
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def check_fleet_edges(ai_settings, aliens):
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"""有外星人到达边缘时采取相应的措施"""
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for alien in aliens.sprites():
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if alien.check_edges():
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change_fleet_direction(ai_settings, aliens)
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break
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def change_fleet_direction(ai_settings, aliens):
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"""将整群外星人下移，并改变它们的方向"""
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for alien in aliens.sprites():
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alien.rect.y += ai_settings.fleet_drop_speed
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ai_settings.fleet_direction *= -1
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def ship_hit(ai_settings, stats, screen, sb, ship, aliens, bullets):
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"""响应被外星人撞到的飞船"""
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if stats.ships_left > 0:
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# 将ships_left减1
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stats.ships_left -= 1
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# 更新记分牌
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sb.prep_ships()
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# 清空外星人列表和子弹列表
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aliens.empty()
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bullets.empty()
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# 创建一群新的外星人，并将飞船放到屏幕底端中央
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create_fleet(ai_settings, screen, ship, aliens)
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ship.center_ship()
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# 暂停
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sleep(3)
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else:
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stats.game_active = False
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pygame.mouse.set_visible(True)
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def check_aliens_bottom(ai_settings, stats, screen, sb, ship, aliens, bullets):
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"""检查是否有外星人到达了屏幕底端"""
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screen_rect = screen.get_rect()
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for alien in aliens.sprites():
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if alien.rect.bottom >= screen_rect.bottom:
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# 像飞船被撞到一样进行处理
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ship_hit(ai_settings, stats, screen, sb, ship, aliens, bullets)
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break
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def check_high_score(stats, sb):
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"""检查是否诞生了新的最高得分"""
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if stats.score > stats.high_score:
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stats.high_score = stats.score
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sb.prep_high_score()
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def update_aliens(ai_settings, stats, screen, sb, ship, aliens, bullets):
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"""
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检查是否有外星人位于屏幕边缘，并更新整群外星人的位置
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"""
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check_fleet_edges(ai_settings, aliens)
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aliens.update()
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# 检测外星人和飞船之间的碰撞
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if pygame.sprite.spritecollideany(ship, aliens):
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ship_hit(ai_settings, stats, screen, sb, ship, aliens, bullets)
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# 检查是否有外星人到达屏幕底端
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check_aliens_bottom(ai_settings, stats, screen, sb, ship, aliens, bullets) |