public void UpdateDragDirectionDisp()
        {
            LineRenderer lr        = GetComponent <LineRenderer> ();
            bool         bDragging = _DragRoter.IsDragging();

            //print ("bDragging:" + bDragging);
            if (!bDragging)
            {
                lr.enabled = false;
                return;
            }
            int         draggingDir = _DragRoter.GetDragingDir();
            CellObjCtrl ctrl        = CellObjCtrlUtils.GetNbCellObjCtrlInAbsDir(_CCtrl, draggingDir);

            if (ctrl == null)
            {
                lr.enabled = false;
            }
            else
            {
                lr.enabled = true;
                Vector3 p0 = _CCtrl.transform.position + new Vector3(0, 0, _zbias);
                Vector3 p1 = ctrl.transform.position + new Vector3(0, 0, _zbias);
                lr.SetPosition(0, p0);
                lr.SetPosition(1, p1);
                lr.useWorldSpace = true;
            }
        }
        void OnMouseDrag()
        {
            if (!MiroPlayingStatus.bPlaying)
            {
                return;
            }

            if (CheckBlock())
            {
                return;
            }

            if (enabled)
            {
                _bDragging = true;
                //Debug.Log (_cctrl.name + " OnMouseDrag" + " rotate");

                Vector3 hitDir = GetHitDir();

                int   rightDir = _cctrl.GetDir();
                float minAngle = 100000.0f;
                for (int dir = 0; dir < 6; dir++)
                {
                    if (_banDirs.Contains(dir))
                    {
                        continue;
                    }
                    CellObjCtrl nbCtrl =
                        CellObjCtrlUtils.GetNbCellObjCtrlInAbsDir(_cctrl, dir);
                    if (nbCtrl == null)
                    {
                        continue;
                    }
                    Vector3 nbDir = nbCtrl.transform.position - _cctrl.transform.position;
                    nbDir.Normalize();

                    float angle = Vector3.Angle(hitDir, nbDir);
                    if (angle < minAngle)
                    {
                        minAngle = angle;
                        rightDir = dir;
                    }
                }

                if (rightDir != _cctrl.GetDir())
                {
                    _cctrl.SetDir(rightDir);
                    _cctrl.ChangeDir();
                    //print ("ChangeDir" + rightDir);

                    _RightDir = rightDir;
                    _DirChanged.Invoke(rightDir);
                }
            }
        }