Function getMaxScatterRadiusCssPx

src/interaction/findNearestPoint.ts:110–149

(seriesCfg: ResolvedScatterSeriesConfig)

};

const getMaxScatterRadiusCssPx = (seriesCfg: ResolvedScatterSeriesConfig): number => {
  const cached = scatterMaxRadiusCache.get(seriesCfg);
  if (cached !== undefined) return cached;

  const data = seriesCfg.data;
  const seriesSymbolSize = seriesCfg.symbolSize;

  let maxRadius = 0;

  // Fast path: numeric (or missing) series size means max is just max(point.size, series/default).
  if (typeof seriesSymbolSize !== 'function') {
    const seriesFallback =
      typeof seriesSymbolSize === 'number' && Number.isFinite(seriesSymbolSize)
        ? Math.max(0, seriesSymbolSize)
        : DEFAULT_SCATTER_RADIUS_CSS_PX;

    let maxPerPoint = 0;
    let anyPointWithoutSize = false;
    for (let i = 0; i < data.length; i++) {
      const pSize = getPointSizeCssPx(data[i]);
      if (pSize == null) {
        anyPointWithoutSize = true;
      } else {
        const r = Math.max(0, pSize);
        if (r > maxPerPoint) maxPerPoint = r;
      }
    }
    maxRadius = anyPointWithoutSize ? Math.max(maxPerPoint, seriesFallback) : maxPerPoint;
  } else {
    // Slow path: symbolSize function can vary per point, so compute true max once and cache it.
    for (let i = 0; i < data.length; i++) {
      const r = getScatterRadiusCssPx(seriesCfg, data[i]);
      if (r > maxRadius) maxRadius = r;
    }
  }

  maxRadius = Number.isFinite(maxRadius) ? Math.max(0, maxRadius) : DEFAULT_SCATTER_RADIUS_CSS_PX;
  scatterMaxRadiusCache.set(seriesCfg, maxRadius);
  return maxRadius;
};

// Note: we intentionally do NOT compute “nearest bar by distance”.
// Bars are only considered a match when the cursor is inside their rect bounds.