Method getExtent

src/scale/scaleMapper.ts:237–237

* [NOTICE]: * In EC_FULL_UPDATE_CYCLE, scale extent is finally determined at `coordSys#update` stage. * * Get a clone of the scale extent. * An extent is always in an increase order. * It always returns an array - never be a null/undefined. * * @see SCALE_EXTENT_C

(this: This)

     * @see SCALE_EXTENT_CONSTRUCTION for the full processing flow.
     */
    getExtent(this: This): number[];

    /**
     * [NOTICE]: