pygame/game_functions.py

import sys
from time import sleep

import pygame

from bullet import Bullet
from bazi import Bazi

def check_keydown_events(event, ai_settings, screen, man, bullets):
    """对按键做出反应"""
    if event.key == pygame.K_RIGHT:
        man.moving_right = True
    elif event.key == pygame.K_LEFT:
        man.moving_left = True
    elif event.key == pygame.K_SPACE:
        fire_bullet(ai_settings, screen, man, bullets)
    elif event.key == pygame.K_q:
        sys.exit()
        
def check_keyup_events(event, man):
    """响应按键的发布"""
    if event.key == pygame.K_RIGHT:
        man.moving_right = False
    elif event.key == pygame.K_LEFT:
        man.moving_left = False

def check_events(ai_settings, screen, stats, sb, play_button, man, bazis,
        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, man, bullets)
        elif event.type == pygame.KEYUP:
            check_keyup_events(event, man)
        elif event.type == pygame.MOUSEBUTTONDOWN:
            mouse_x, mouse_y = pygame.mouse.get_pos()
            check_play_button(ai_settings, screen, stats, sb, play_button,
                man, bazis, bullets, mouse_x, mouse_y)
            
def check_play_button(ai_settings, screen, stats, sb, play_button, man,
        bazis, bullets, mouse_x, mouse_y):
    """当玩家点击Play时开始一个新游戏"""
    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()
        
        # 隐藏鼠标光标
        pygame.mouse.set_visible(False)
        
        # 重置游戏统计信息
        stats.reset_stats()
        stats.game_active = True
        
        # 重置记分板图像
        sb.prep_score()
        sb.prep_high_score()
        sb.prep_level()
        sb.prep_mans()
        
        # 清空靶子和子弹的名单
        bazis.empty()
        bullets.empty()
        
        # 创建一个人并将其置于中心
        create_fleet(ai_settings, screen, man, bazis)
        man.center_man()

def fire_bullet(ai_settings, screen, man, bullets):
    """发射一颗子弹，如果还没有达到极限"""
    # 创建新项目符号，添加到项目符号组
    if len(bullets) < ai_settings.bullets_allowed:
        new_bullet = Bullet(ai_settings, screen, man)
        bullets.add(new_bullet)

def update_screen(ai_settings, screen, stats, sb, man, bazis, bullets,
        play_button):
    """更新屏幕上的图像，然后切换到新屏幕。"""
    # 重新绘制屏幕，每次通过循环
    screen.fill(ai_settings.bg_color)
    
    # 重画所有子弹，在人和靶子后面
    for bullet in bullets.sprites():
        bullet.draw_bullet()
    man.blitme()
    bazis.draw(screen)
    
    # 绘制分数信息
    sb.show_score()
    
    # 如果游戏处于非活动状态，则绘制播放按钮
    if not stats.game_active:
        play_button.draw_button()

    # 使最近绘制的屏幕可见
    pygame.display.flip()
    
def update_bullets(ai_settings, screen, stats, sb, man, bazis, bullets):
    """更新子弹的位置，清除旧子弹"""
    # 更新子弹位置
    bullets.update()

    # 扔掉已经消失的子弹
    for bullet in bullets.copy():
        if bullet.rect.bottom <= 0:
            bullets.remove(bullet)
            
    check_bullet_bazi_collisions(ai_settings, screen, stats, sb, man,
        bazis, bullets)
        
def check_high_score(stats, sb):
    """查看是否有新的高分"""
    if stats.score > stats.high_score:
        stats.high_score = stats.score
        sb.prep_high_score()
            
def check_bullet_bazi_collisions(ai_settings, screen, stats, sb, man,
        bazis, bullets):
    """对子弹和靶子的碰撞做出反应（碰撞检测）"""
    # 移除所有碰撞的子弹和靶子
    collisions = pygame.sprite.groupcollide(bullets, bazis, True, True)
    
    if collisions:
        for bazis in collisions.values():
            stats.score += ai_settings.bazi_points * len(bazis)
            sb.prep_score()
        check_high_score(stats, sb)
    
    if len(bazis) == 0:
        # 如果靶子都被摧毁，开始一个新的关卡
        bullets.empty()
        ai_settings.increase_speed()
        
        # 提高水平
        stats.level += 1
        sb.prep_level()
        
        create_fleet(ai_settings, screen, man, bazis)
    
def check_fleet_edges(ai_settings, bazis):
    """如果有靶子到达边缘，请做出适当的反应"""
    for bazi in bazis.sprites():
        if bazi.check_edges():
            change_fleet_direction(ai_settings, bazis)
            break
        
def change_fleet_direction(ai_settings, bazis):
    """放下整个队列，改变队列的方向"""
    for bazi in bazis.sprites():
        bazi.rect.y += ai_settings.fleet_drop_speed
    ai_settings.fleet_direction *= -1
    
def man_hit(ai_settings, screen, stats, sb, man, bazis, bullets):
    """回应被靶子碰撞的人"""
    if stats.mans_left > 0:
        # 向左递减
        stats.mans_left -= 1
        
        # 更新分数面板
        sb.prep_mans()
        
    else:
        stats.game_active = False
        pygame.mouse.set_visible(True)
    
    # 清空靶子和子弹的名单
    bazis.empty()
    bullets.empty()
    
    # 创建一个新角色，并将人居中
    create_fleet(ai_settings, screen, man, bazis)
    man.center_man()

    sleep(0.5)
    
def check_bazis_bottom(ai_settings, screen, stats, sb, man, bazis,
        bullets):
    """检查是否有靶子到达屏幕底部"""
    screen_rect = screen.get_rect()
    for bazi in bazis.sprites():
        if bazi.rect.bottom >= screen_rect.bottom:
            # 人被击中一样
            man_hit(ai_settings, screen, stats, sb, man, bazis, bullets)
            break
            
def update_bazis(ai_settings, screen, stats, sb, man, bazis, bullets):
    """
    检查靶子是否处于边缘，然后更新靶子中所有靶子的位置
    """
    check_fleet_edges(ai_settings, bazis)
    bazis.update()
    
    # 寻找人和靶子碰撞
    if pygame.sprite.spritecollideany(man, bazis):
        man_hit(ai_settings, screen, stats, sb, man, bazis, bullets)

    # 在屏幕底部寻找靶子
    check_bazis_bottom(ai_settings, screen, stats, sb, man, bazis, bullets)
            
def get_number_bazis_x(ai_settings, bazi_width):
    """确定排成一行的外星人的数量"""
    available_space_x = ai_settings.screen_width - 1 * bazi_width
    number_bazi_x = int(available_space_x / (2 * bazi_width))
    return number_bazi_x
    
def get_number_rows(ai_settings, man_height, bazi_height):
    """确定适合屏幕的外星人行数"""
    available_space_y = (ai_settings.screen_height -
                            (1 * bazi_height) - man_height)
    number_rows = int(available_space_y / (2 * bazi_height))
    return number_rows
    
def create_bazi(ai_settings, screen, bazis, bazi_number, row_number):
    """创建一个靶子，并将其放置在行中"""
    bazi = Bazi(ai_settings, screen)
    bazi_width = bazi.rect.width
    bazi.x = bazi_width + 2 * bazi_width * bazi_number
    bazi.rect.x = bazi.x
    bazi.rect.y = bazi.rect.height + 2 * bazi.rect.height * row_number
    bazis.add(bazi)

def create_fleet(ai_settings, screen, man, bazis):
    """创造一个完整的靶子队列"""
    # 创建一个靶子，并查找一行中的靶子数量
    bazi = Bazi(ai_settings, screen)
    number_bazis_x = get_number_bazis_x(ai_settings, bazi.rect.width)
    number_rows = get_number_rows(ai_settings, man.rect.height,
        bazi.rect.height)
    
    # 创造外星人舰队
    for row_number in range(number_rows):
        for bazi_number in range(number_bazis_x):
            create_bazi(ai_settings, screen, bazis, bazi_number,
                row_number)