public void MoveRight()
 {
     LeftTopCorner = new RenderCell(0, 1);
 }
 public void MoveLeft()
 {
     LeftTopCorner = new RenderCell(0, -1);
 }
 public void MoveUp()
 {
     LeftTopCorner = new RenderCell(-1, 0);
 }
 public void MoveDown()
 {
     LeftTopCorner = new RenderCell(1, 0);
 }
 /// <summary>
 /// 1.Parameter is the top left corner of the render
 /// 2.parameter is the render size
 /// </summary>
 /// <param name="renderLeftTopCorner"></param>
 /// <param name="renderSize"></param>
 public RenderHelper(RenderCell renderLeftTopCorner, RenderSize renderSize)
 {
     leftTopCorner = renderLeftTopCorner;
     size          = renderSize;
 }