Method setExtent

src/scale/Ordinal.ts:219–221

* NOTICE: OrdinalScale extent should always originates from * `[0, ordinalMeta.categories.length - 1]`, regardless of min/max of `series.data`. * But settings like `xxxAxis.min/max` can still modify the extent. * It is handled by constructor of `ScaleRawExtentInfo`.

(start, end)

         * It is handled by constructor of `ScaleRawExtentInfo`.
         */
        setExtent(start, end) {
            return this._mapper.setExtent(start, end);
        },

        setExtent2(kind, start, end) {
            return this._mapper.setExtent2(kind, start, end);