_extendOptions(options) {
    const selectionStyles = fObjectOptions.SELECTION_STYLE;
    const { canvasImage, createStaticCanvas } = this.graphics;

    options = extend({}, SHAPE_INIT_OPTIONS, this._options, selectionStyles, options);

    return makeFabricFillOption(options, canvasImage, createStaticCanvas);
  }
Get the options to create the shape
@param {Object} options - Options to creat the shape
@returns {Object} Shape options
@private