Method _updateViewCoordSys

src/chart/tree/TreeView.ts:252–297

(seriesModel: TreeSeriesModel, api: ExtensionAPI)

    }

    private _updateViewCoordSys(seriesModel: TreeSeriesModel, api: ExtensionAPI) {
        const data = seriesModel.getData();
        const points: number[][] = [];
        data.each(function (idx) {
            const layout = data.getItemLayout(idx);
            if (layout && !isNaN(layout.x) && !isNaN(layout.y)) {
                points.push([+layout.x, +layout.y]);
            }
        });
        const min: number[] = [];
        const max: number[] = [];
        bbox.fromPoints(points, min, max);

        // If don't Store min max when collapse the root node after roam,
        // the root node will disappear.
        const oldMin = this._min;
        const oldMax = this._max;

        // If width or height is 0
        if (max[0] - min[0] === 0) {
            min[0] = oldMin ? oldMin[0] : min[0] - 1;
            max[0] = oldMax ? oldMax[0] : max[0] + 1;
        }
        if (max[1] - min[1] === 0) {
            min[1] = oldMin ? oldMin[1] : min[1] - 1;
            max[1] = oldMax ? oldMax[1] : max[1] + 1;
        }

        // Here we use viewCoordSys just for computing the 'position' and 'scale' of the group,
        // and 'treeRoam' action.
        const ownCoordSys = seriesModel.coordinateSystem = createViewCoordSysSimply(
            seriesModel,
            api,
            min[0], min[1], max[0] - min[0], max[1] - min[1]
        );

        applyViewCoordSysTransToElement(
            this.group,
            VIEW_COORD_SYS_TRANS_OVERALL,
            ownCoordSys,
            this._firstRender ? null : seriesModel,
        );

        this._min = min;
        this._max = max;
    }

    _updateNodeAndLinkScale(seriesModel: TreeSeriesModel) {
        const data = seriesModel.getData();