void Show_Extend() { //cleardevice(); Date_IMAGE_Init(); Play = { 400,350,169,52, BLACK,"简单模式" }; Introduce = { 400, 404, 169, 52, BLACK, "困难模式" }; Upgrade_of_Combat = { 400, 456, 169, 52,BLACK, "炼狱模式" }; while(1) { // 贴图 & 绘制按键 DrawAlpha_Transparent(&img_tmp_Extend, 0, 0, &img_Extend); DrawAlpha_Transparent(&img_tmp_Extend, Play.x, Play.y, &img_Extend_Button); DrawAlpha_Transparent(&img_tmp_Extend, Introduce.x, Introduce.y, &img_Extend_Button); DrawAlpha_Transparent(&img_tmp_Extend, Upgrade_of_Combat.x, Upgrade_of_Combat.y, &img_Extend_Button); DrawAlpha_Transparent(&img_tmp_Extend, 100, 0, &Plane_Game); putimage(0, 0, &img_tmp_Extend); DrawImage_BUTTON(&Play); DrawImage_BUTTON(&Upgrade_of_Combat); DrawImage_BUTTON(&Introduce); FlushBatchDraw(); // 按键判断 if (MouseHit()) { MOUSEMSG msg = GetMouseMsg(); if (Switch_Buton(&Play, msg.x, msg.y)) Play.color = RGB(234, 54, 128); else Play.color = BLACK; if (Switch_Buton(&Upgrade_of_Combat, msg.x, msg.y)) Upgrade_of_Combat.color = RGB(234, 54, 128); else Upgrade_of_Combat.color = BLACK; if (Switch_Buton(&Introduce, msg.x, msg.y)) Introduce.color = RGB(234, 54, 128); else Introduce.color = BLACK; switch (msg.uMsg) { case WM_LBUTTONDOWN: if (Switch_Buton(&Play, msg.x, msg.y)) // 简单模式 { enemya_num = 12; v_enemyb = 3; v_enemyc = 5; BOSS_Damage = 5; BOSS_num = 12; goto next; } if (Switch_Buton(&Upgrade_of_Combat, msg.x, msg.y)) // 困难模式 { enemya_num = 15; v_enemyb = 6; v_enemyc = 8; BOSS_Damage = 8; BOSS_num = 15; goto next; } if (Switch_Buton(&Introduce, msg.x, msg.y)) // 炼狱模式 { enemya_num = 20; v_enemyb = 9; v_enemyc = 10; BOSS_Damage = 15; BOSS_num = 20; goto next; } } } } next: Init_Button(); f[0] = 0; cleardevice(); }请为上述程序画出流程图

抱歉，我无法为您画出流程图，但是我可以将代码进行简要的注释，帮助您更好地理解程序的执行流程：

void Show_Extend() { 	// 清空屏幕并初始化图片
    Date_IMAGE_Init();
    // 定义三个按钮对象
    Play = { 400,350,169,52, BLACK,"简单模式" };
    Introduce = { 400, 404, 169, 52, BLACK, "困难模式" };
    Upgrade_of_Combat = { 400, 456, 169, 52,BLACK, "炼狱模式" };
 	
    while(1) { 		// 贴图 & 绘制按键
        // 绘制背景图
        DrawAlpha_Transparent(&img_tmp_Extend, 0, 0, &img_Extend);
        // 绘制三个按钮
        DrawAlpha_Transparent(&img_tmp_Extend, Play.x, Play.y, &img_Extend_Button);
        DrawAlpha_Transparent(&img_tmp_Extend, Introduce.x, Introduce.y, &img_Extend_Button);
        DrawAlpha_Transparent(&img_tmp_Extend, Upgrade_of_Combat.x, Upgrade_of_Combat.y, &img_Extend_Button);
        // 绘制飞机图片
        DrawAlpha_Transparent(&img_tmp_Extend, 100, 0, &Plane_Game);
        // 显示整个界面
        putimage(0, 0, &img_tmp_Extend);
        // 绘制三个按钮对象
        DrawImage_BUTTON(&Play);
        DrawImage_BUTTON(&Upgrade_of_Combat);
        DrawImage_BUTTON(&Introduce);  	
        FlushBatchDraw();	// 更新屏幕
 
        if (MouseHit()) { 		// 判断鼠标是否点击
            MOUSEMSG msg = GetMouseMsg(); // 获取鼠标信息
            // 判断鼠标是否在按钮范围内
            if (Switch_Buton(&Play, msg.x, msg.y)) Play.color = RGB(234, 54, 128); 
            else Play.color = BLACK; 
            if (Switch_Buton(&Upgrade_of_Combat, msg.x, msg.y)) Upgrade_of_Combat.color = RGB(234, 54, 128); 
            else Upgrade_of_Combat.color = BLACK; 
            if (Switch_Buton(&Introduce, msg.x, msg.y)) Introduce.color = RGB(234, 54, 128);
            else Introduce.color = BLACK; 

            switch (msg.uMsg) { 			// 判断鼠标操作类型
                case WM_LBUTTONDOWN: 				// 左键按下
                    if (Switch_Buton(&Play, msg.x, msg.y)) // 简单模式
                    { 
                        enemya_num = 12; 
                        v_enemyb = 3; 
                        v_enemyc = 5; 
                        BOSS_Damage = 5; 
                        BOSS_num = 12; 
                        goto next; 				// 跳转到下一步
                    } 
                    if (Switch_Buton(&Upgrade_of_Combat, msg.x, msg.y))  // 困难模式
                    { 
                        enemya_num = 15; 
                        v_enemyb = 6; 
                        v_enemyc = 8; 
                        BOSS_Damage = 8; 
                        BOSS_num = 15; 
                        goto next; 				// 跳转到下一步
                    } 
                    if (Switch_Buton(&Introduce, msg.x, msg.y)) // 炼狱模式
                    { 
                        enemya_num = 20; 
                        v_enemyb = 9; 
                        v_enemyc = 10; 
                        BOSS_Damage = 15; 
                        BOSS_num = 20; 
                        goto next; 				// 跳转到下一步
                    } 
            } 
        } 
    } 
  
    next: // 标记跳转位置
        Init_Button(); // 初始化按钮
        f[0] = 0; // 初始化分数
        cleardevice(); // 清空屏幕
}