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    python外星人与飞船小游戏源码免费下载

    2019-08-13 09:24 来源/作者:懒人模板 分类:Python  « »
     Python3编写的飞船与外星人的小游戏

    import sys
    from time import  sleep
    import pygame
    from bullet import Bullet
    from alien import Alien
     
    def fire_bullet(ai_settings, screen, ship, bullets):
        """如果还没有到达限制,就发射一颗子弹"""
        #创建新子弹,并将其加入到编组bullets中
        if len(bullets) < ai_settings.bullets_allowed:
            new_bullet = Bullet(ai_settings, screen, ship)
            bullets.add(new_bullet)
     
    def check_keydown_events(event, ai_settings, screen, ship, bullets):
        """响应按键"""
        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:
            fire_bullet(ai_settings, screen, ship, bullets)
        elif event.key == pygame.K_q:
            sys.exit()
     
    def check_keyup_events(event,ship):
        """响应松开"""
        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):
        """响应按键和鼠标事件"""
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            elif event.type == pygame.KEYDOWN:
                check_keydown_events(event, ai_settings, screen, ship, 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):
        """在玩家单击Play按钮时开始新游戏"""
        button_clicked = play_button.rect.collidepoint(mouse_x, mouse_y)
        if button_clicked and not stats.game_active:
            #重置游戏设置
            ai_settings.initialize_dynamic_settings()
     
            #隐藏光标
            pygame.mouse.set_visible(False)
     
            #重置游戏统计信息
            stats.reset_stats()
            stats.game_active = True
     
            #重置记分牌图像
            sb.prep_score()
            sb.prep_high_score()
            sb.prep_level()
            sb.prep_ships()
     
            #清空外星人列表和子弹列表
            aliens.empty()
            bullets.empty()
     
            #创建一群新的外星人,并让飞船居中
            create_fleet(ai_settings, screen, ship, aliens)
            ship.center_ship()
     
     
    def update_screen(ai_settings, screen, stats, sb, ship, aliens, bullets, play_button):
        """更新屏幕上的图像,并切换到新屏幕"""
        #每次循环时都重绘屏幕
        screen.fill(ai_settings.bg_color)
     
        #在飞船和外星人后面重绘所有子弹
        for bullet in bullets.sprites():
            bullet.draw_bullet()
        ship.blitme()
        aliens.draw(screen)
     
        #显示得分
        sb.show_score()
     
        #如果游戏处于非活动状态,就绘制Play按钮
        if not stats.game_active:
            play_button.draw_button()
     
        #让最近绘制的屏幕可见
        pygame.display.flip()
     
    def update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets):
        """更新子弹的位置,并删除已消失的子弹"""
        #更新子弹的位置
        bullets.update()
     
        #删除已消失的子弹
        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_bullet_alien_collisions(ai_settings, screen, stats, sb, ship, aliens, bullets):
        """响应子弹和外星人的碰撞"""
        #删除发生碰撞的子弹和外星人
        collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)
     
        if collisions:
            for aliens in collisions.values():
                stats.score += ai_settings.alien_points * len(aliens)
                sb.prep_score()
            check_high_score(stats, sb)
     
        if len(aliens) == 0:
            #删除现有的子弹并重新创建一群外星人
            bullets.empty()
            ai_settings.increase_speed()
            #提升等级
            stats.level += 1
            sb.prep_level()
            create_fleet(ai_settings, screen, ship, aliens)
     
    def get_number_aliens_x(ai_settings, alien_width):
        """计算每行可容纳多少个外星人"""
        available_space_x = ai_settings.screen_width - 2*alien_width
        number_alien_x = int(available_space_x / (2*alien_width))
        return number_alien_x
     
    def get_number_rows(ai_settings, ship_height, alien_height):
        """计算屏幕可容纳多少行外星人"""
        available_space_y = (ai_settings.screen_height - (3 * 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):
        """创建一个外星人并将其放在当前行"""
        alien = Alien(ai_settings, screen)
        alien_width = alien.rect.width
        alien.x = alien_width + 2 * alien_width * alien_number
        alien.rect.x = alien.x
        alien.rect.y = alien.rect.height + 2 * alien_width * row_number
        aliens.add(alien)
     
    def create_fleet(ai_settings, screen, ship, aliens):
        """创建外星人群"""
        #创建一个外星人,并计算一行可容纳多少外星人
        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)
     
        #创建外星人群
        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):
        """有外星人到达边缘时采取相应的措施"""
        for alien in aliens.sprites():
            if alien.check_edges():
                change_fleet_direction(ai_settings, aliens)
                break
     
    def change_fleet_direction(ai_settings, aliens):
        """将整群外星人下移,并改变它们的方向"""
        for alien in aliens.sprites():
            alien.rect.y += ai_settings.fleet_drop_speed
        ai_settings.fleet_direction *= -1
     
    def ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets):
        """响应被外星人撞到的飞船"""
     
        if stats.ships_left > 0:
            #将ship_left减1
            stats.ships_left -= 1
     
            #更新记分牌
            sb.prep_ships()
     
            #清空外星人列表和子弹列表
            aliens.empty()
            bullets.empty()
     
            #创建一群新的外星人,并将飞船放到屏幕底端中央
            create_fleet(ai_settings, screen, ship, aliens)
            ship.center_ship()
     
            #暂停
            sleep(0.5)
     
        else:
            stats.game_active = False
            pygame.mouse.set_visible(True)
     
    def check_aliens_bottom(ai_settings, screen, stats, sb, ship, aliens, bullets):
        """检查是否有外星人到达了屏幕底端"""
        screen_rect = screen.get_rect()
        for alien in aliens.sprites():
            if alien.rect.bottom >= screen_rect.bottom:
                #像飞船被撞到一样进行处理
                ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets)
                break
     
    def update_aliens(ai_settings, screen, stats, sb, ship, aliens, bullets):
        """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"""
        check_fleet_edges(ai_settings, aliens)
        aliens.update()
     
        #检测外星人和飞船之间的碰撞
        if pygame.sprite.spritecollideany(ship, aliens):
            ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets)
     
        #检查是否有外星人到达屏幕底端
        check_aliens_bottom(ai_settings, screen, stats, sb, ship, aliens, bullets)
     
    def check_high_score(stats, sb):
        """检查是否诞生了新的最高得分"""
        if stats.score > stats.high_score:
            stats.high_score = stats.score
            sb.prep_high_score()
     
     
     
     

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