dist/vue-draggable-nested-tree.es.js
function offsetToViewPort() {
      var r = this.nodeInnerEl.getBoundingClientRect();
      r.x = r.left;
      r.y = r.top;
      return r;
    }
function offsetToViewPort() {
      var r = this.nodeInnerEl.getBoundingClientRect();
      r.x = r.left;
      r.y = r.top;
      return r;
    }
function offsetToViewPort ( ) { var r = this . nodeInnerEl . getBoundingClientRect ( ) ; r . x = r . left ; r . y = r . top ; return r ; }
right bottom point
right bottom point