code: function () {
          // Must update after view transform updated
          var rawTransformMatrix = this._rawTransformable.getLocalTransform();
          var roamTransform = this._roamTransformable;
          var defaultCenter = this.getDefaultCenter();
          var center = this.getCenter();
          var zoom = this.getZoom();
  
          center = vector.applyTransform([], center, rawTransformMatrix);
          defaultCenter = vector.applyTransform([], defaultCenter, rawTransformMatrix);
  
          roamTransform.origin = center;
          roamTransform.position = [
              defaultCenter[0] - center[0],
              defaultCenter[1] - center[1]
          ];
          roamTransform.scale = [zoom, zoom];
  
          this._updateTransform();
      }
docs: Remove roam