Method _updateInterval

src/component/visualMap/ContinuousView.ts:449–470

* @private * @param {(number|string)} handleIndex 0 or 1 or 'all' * @param {number} dx * @param {number} dy

(handleIndex: 0 | 1 | 'all', delta: number)

     * @param {number} dy
     */
    private _updateInterval(handleIndex: 0 | 1 | 'all', delta: number) {
        delta = delta || 0;
        const visualMapModel = this.visualMapModel;
        const handleEnds = this._handleEnds;
        const sizeExtent = [0, visualMapModel.itemSize[1]];

        sliderMove(
            delta,
            handleEnds,
            sizeExtent,
            handleIndex,
            // cross is forbidden
            0
        );

        const dataExtent = visualMapModel.getExtent();
        // Update data interval.
        this._dataInterval = [
            linearMap(handleEnds[0], sizeExtent, dataExtent, true),
            linearMap(handleEnds[1], sizeExtent, dataExtent, true)
        ];
    }

    private _updateView(forSketch?: boolean) {
        const visualMapModel = this.visualMapModel;