int ShowCube(){                                     //生成一个方块的同时,在右上角显示下一个方块的形态
    int left,top;
    srand(SDL_GetTicks());
    curblk.number = next;
    next = random(CurBlkNum);
    Block nextblk = blk[next];
    nextblk.Reset(15,2);
    Screen.bar(350,100,150,200,BLACK);                           // clear previous image
    xyprintf(330,100,"Next: ");
    Screen.rectangle(350,120,500,220,WHITE);
    nextblk.DrawCube();
    // update a new block
    blk[curblk.number].Reset();                                 //恢复方块初始坐标(回到最上面)
    curblk = blk[curblk.number];
    curblk.DrawCube();
    Screen.flip();
    if( !curblk.isOk() ){                            //满了
//        Complete();
//        gameOver = true;
    }
    return 0;
}
int ThreadFunc(void * unused){
    int old_time,cur_time,x,y;
    old_time = cur_time = SDL_GetTicks();
    while( !gameOver ){
        while( alive ){
            while( !Operation.isEmpty() && alive){
                EnterCriticalSection(&cs);
                Operation.DeleteQ(command);
                curblk.ClearCube();
                switch( command ){
                    case MOVEDOWN: curblk.MoveDown();
                                   break;
                    case MOVELEFT: curblk.MoveLeft();
                                   break;
                    case MOVERIGHT:curblk.MoveRight();
                                   break;
                    case ROTATE  : curblk.Rotate();
                                   break;
                 }
                 if( command == TURNNEXT ){                 //有的特殊命令最好特殊处理
                    curblk.TurnNext();
                    break;
                 }
                 curblk.DrawCube();
                 Screen.flip();
                 LeaveCriticalSection(&cs);
            }
            cur_time = SDL_GetTicks();
            SDL_Delay(1);
            if( !AIMode ){
                if( cur_time - old_time < 500 ) continue;
                old_time = cur_time;
                Operation.AddQ(MOVEDOWN);
            }else{
                if( cur_time - old_time < 50 ) continue;
                old_time = cur_time;
                x = curblk.x;
                y = curblk.y;
                if( BestRotate>0 ){
                    Operation.AddQ(ROTATE);
                    BestRotate -= 1;
                    continue;
                }
                if( BestPath[x][y+1] ){
                    Operation.AddQ(MOVEDOWN);
                    BestPath[x][y+1] = 0;
                    y += 1;
                    continue;
                }else if( BestPath[x+1][y] ){
                    Operation.AddQ(MOVERIGHT);
                    BestPath[x+1][y] = 0;
                    x += 1;
                    continue;
                }else if( BestPath[x-1][y] ){
                    Operation.AddQ(MOVELEFT);
                    BestPath[x-1][y] = 0;
                    x -= 1;
                    continue;
                }
                alive = 0;
            }
        }
        while(DelLine());
        Operation.ClearQ();
        ShowCube();
        ShowScore();
        if( AIMode ) Search();
        alive = 1;
    }
    return 0;
}