Method constructor

src/base/stack-mixin.js:13–51

()

 */
export class StackMixin extends CoordinateGridMixin {
    constructor () {
        super();

        this._stackLayout = stack();

        this._stack = [];
        this._titles = {};

        this._hidableStacks = false;
        this._evadeDomainFilter = false;

        this.data(() => {
            const layers = this._stack.filter(this._visibility);
            if (!layers.length) {
                return [];
            }
            layers.forEach((l, i) => this._prepareValues(l, i));
            const v4data = layers[0].values.map((v, i) => {
                const col = {x: v.x};
                layers.forEach(layer => {
                    col[layer.name] = layer.values[i].y;
                });
                return col;
            });
            const keys = layers.map(layer => layer.name);
            const v4result = this.stackLayout().keys(keys)(v4data);
            v4result.forEach((series, i) => {
                series.forEach((ys, j) => {
                    layers[i].values[j].y0 = ys[0];
                    layers[i].values[j].y1 = ys[1];
                });
            });
            return layers;
        });

        this.colorAccessor(function (d) {
            return this.layer || this.name || d.name || d.layer;
        });
    }

    _prepareValues (layer, layerIdx) {
        const valAccessor = layer.accessor || this.valueAccessor();