Method _preprocessData

src/charts/series-chart.js:55–95

()

    }

    _preprocessData () {
        const keep = [];
        let childrenChanged;

        const nesting = d3compat.nester({
            key: this._seriesAccessor,
            sortKeys: this._seriesSort,
            sortValues: this._valueSort,
            entries: this.data()
        });

        const children =
            nesting.map((sub, i) => {
                const subChart = this._charts[sub.key] || this._chartFunction(this, this._chartGroup , sub.key, i);
                if (!this._charts[sub.key]) {
                    childrenChanged = true;
                }
                this._charts[sub.key] = subChart;
                keep.push(sub.key);
                return subChart
                    .dimension(this.dimension())
                    .group({
                        all: typeof sub.values === 'function' ? sub.values : utils.constant(sub.values)
                    }, sub.key)
                    .keyAccessor(this.keyAccessor())
                    .valueAccessor(this.valueAccessor())
                    .brushOn(false);
            });
        // this works around the fact compositeChart doesn't really
        // have a removal interface
        Object.keys(this._charts)
            .filter(c => keep.indexOf(c) === -1)
            .forEach(c => {
                this._clearChart(c);
                childrenChanged = true;
            });
        this._compose(children);
        if (childrenChanged && this.legend()) {
            this.legend().render();
        }
    }

    _clearChart (c) {
        if (this._charts[c].g()) {