code: function move(offsetX, offsetY) {
      var imageData = this.imageData;
  
  
      this.moveTo(isUndefined(offsetX) ? offsetX : imageData.left + Number(offsetX), isUndefined(offsetY) ? offsetY : imageData.top + Number(offsetY));
  
      return this;
    }
docs: Move the image with relative offsets.
  @param {number} offsetX - The relative offset distance on the x-axis.
  @param {number} offsetY - The relative offset distance on the y-axis.
  @returns {Viewer} this