Function computeBarClusterSlots

src/interaction/findNearestPoint.ts:160–194

(
  seriesConfigs: ReadonlyArray<ResolvedBarSeriesConfig>,
)

}>;

export function computeBarClusterSlots(
  seriesConfigs: ReadonlyArray<ResolvedBarSeriesConfig>,
): BarClusterSlots {
  // Cluster slots (mirrors `createBarRenderer.ts`):
  // - Each unique non-empty stackId gets a single cluster slot.
  // - Each unstacked series gets its own cluster slot.
  const stackIdToClusterIndex = new Map<string, number>();
  const clusterIndexBySeries: number[] = new Array(seriesConfigs.length);
  const stackIdBySeries: string[] = new Array(seriesConfigs.length);

  let clusterCount = 0;
  for (let i = 0; i < seriesConfigs.length; i++) {
    const stackId = normalizeStackId(seriesConfigs[i].stack);
    stackIdBySeries[i] = stackId;

    if (stackId !== '') {
      const existing = stackIdToClusterIndex.get(stackId);
      if (existing !== undefined) {
        clusterIndexBySeries[i] = existing;
      } else {
        const idx = clusterCount++;
        stackIdToClusterIndex.set(stackId, idx);
        clusterIndexBySeries[i] = idx;
      }
    } else {
      clusterIndexBySeries[i] = clusterCount++;
    }
  }

  return {
    clusterIndexBySeries,
    clusterCount: Math.max(1, clusterCount),
    stackIdBySeries,
  };
}

export function computeBarCategoryStep(seriesConfigs: ReadonlyArray<ResolvedBarSeriesConfig>): number {
  const xs: number[] = [];