Method getItemVisual

src/data/SeriesData.ts:1191–1199

(idx: number, key: K)

     */
    // eslint-disable-next-line
    getItemVisual<K extends keyof Visual>(idx: number, key: K): Visual[K] {
        const itemVisual = this._itemVisuals[idx] as Visual;
        const val = itemVisual && itemVisual[key];
        if (val == null) {
            // Use global visual property
            return this.getVisual(key);
        }
        return val;
    }

    /**
     * If exists visual property of single data item