Move the canvas with relative offsets
@param {number} offsetX - The relative offset distance on the x-axis.
@param {number} [offsetY=offsetX] - The relative offset distance on the y-axis.
@returns {Cropper} this
function move(offsetX) {
    var offsetY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : offsetX;
    var _this$canvasData = this.canvasData,
        left = _this$canvasData.left,
        top = _this$canvasData.top;
    return this.moveTo(isUndefined(offsetX) ? offsetX : left + Number(offsetX), isUndefined(offsetY) ? offsetY : top + Number(offsetY));
  }