code: function moveSelectionHelper(hepler, startX, startY, endX, endY) {
  
                      var box = transformBox(startX, startY, endX, endY);
  
                      helper.css({
                          "top": box.beginY + "px",
                          "left": box.beginX + "px",
                          "width": (box.endX - box.beginX) + "px",
                          "height": (box.endY - box.beginY) + "px"
                      });
                  }
docs: Method move selection helper
  @param  {Element} hepler
  @param  {Number} startX
  @param  {Number} startY
  @param  {Number} endX
  @param  {Number} endY