Function buildPayload

src/ChartGPU.ts:1079–1122

(match: HitTestMatch | null, event: PointerEvent)

  };

  const buildPayload = (match: HitTestMatch | null, event: PointerEvent): ChartGPUEventPayload => {
    if (!match) {
      return { seriesIndex: null, dataIndex: null, value: null, seriesName: null, event };
    }

    const seriesIndex = match.kind === 'cartesian' ? match.match.seriesIndex : match.seriesIndex;
    const dataIndex = match.kind === 'cartesian' ? match.match.dataIndex : match.dataIndex;

    const series = resolvedOptions.series[seriesIndex];
    const seriesNameRaw = series?.name ?? null;
    const seriesName = seriesNameRaw && seriesNameRaw.trim().length > 0 ? seriesNameRaw : null;

    if (match.kind === 'pie') {
      // Pie series are non-cartesian; expose slice value in y so consumers can read a numeric.
      return {
        seriesIndex,
        dataIndex,
        value: [0, match.sliceValue],
        seriesName,
        event,
      };
    }

    if (match.kind === 'candlestick') {
      const timestamp = getOHLCTimestamp(match.point);
      const close = getOHLCClose(match.point);
      return {
        seriesIndex,
        dataIndex,
        value: [timestamp, close],
        seriesName,
        event,
      };
    }

    const { x, y } = getPointXY(match.match.point);
    return {
      seriesIndex,
      dataIndex,
      value: [x, y],
      seriesName,
      event,
    };
  };

  const emit = (
    eventName: ChartGPUEventName,