Method render

src/chart/custom/CustomView.ts:215–269

(
        customSeries: CustomSeriesModel,
        ecModel: GlobalModel,
        api: ExtensionAPI,
        payload: Payload
    )

    private _progressiveEls: Element[];

    render(
        customSeries: CustomSeriesModel,
        ecModel: GlobalModel,
        api: ExtensionAPI,
        payload: Payload
    ): void {

        // Clear previously rendered progressive elements.
        this._progressiveEls = null;

        const oldData = this._data;
        const data = customSeries.getData();
        const group = this.group;
        const renderItem = makeRenderItem(customSeries, data, ecModel, api);

        if (!oldData) {
            // Previous render is incremental render or first render.
            // Needs remove the incremental rendered elements.
            group.removeAll();
        }

        data.diff(oldData)
            .add(function (newIdx) {
                createOrUpdateItem(
                    api, null, newIdx, renderItem(newIdx, payload), customSeries, group,
                    data
                );
            })
            .remove(function (oldIdx) {
                const el = oldData.getItemGraphicEl(oldIdx);
                el && applyLeaveTransition(el, customInnerStore(el).option, customSeries);
            })
            .update(function (newIdx, oldIdx) {
                const oldEl = oldData.getItemGraphicEl(oldIdx);

                createOrUpdateItem(
                    api, oldEl, newIdx, renderItem(newIdx, payload), customSeries, group,
                    data
                );
            })
            .execute();

        // Do clipping
        const clipPath = customSeries.get('clip', true)
            ? createClipPath(customSeries.coordinateSystem, false, customSeries)
            : null;
        if (clipPath) {
            group.setClipPath(clipPath);
        }
        else {
            group.removeClipPath();
        }

        this._data = data;
    }

    incrementalPrepareRender(
        customSeries: CustomSeriesModel,