Function computeBaselineDomainAndPx

src/interaction/findNearestPoint.ts:371–407

(
  seriesConfigs: ReadonlyArray<ResolvedBarSeriesConfig>,
  yScale: LinearScale,
  plotHeightPx: number,
)

}

export function computeBaselineDomainAndPx(
  seriesConfigs: ReadonlyArray<ResolvedBarSeriesConfig>,
  yScale: LinearScale,
  plotHeightPx: number,
): Readonly<{ baselineDomain: number; baselinePx: number }> {
  // Axis-aware baseline logic (mirrors `createBarRenderer.ts`, but in px-space):
  // Determine visible y-domain from yScale via invert(bottom/top) where top=0 and bottom=plotHeightPx.
  const yDomainA = yScale.invert(plotHeightPx);
  const yDomainB = yScale.invert(0);
  const yMin = Math.min(yDomainA, yDomainB);
  const yMax = Math.max(yDomainA, yDomainB);

  let baselineDomain: number;
  if (!Number.isFinite(yMin) || !Number.isFinite(yMax)) {
    baselineDomain = computeBaselineForBarsFromData(seriesConfigs);
  } else if (yMin <= 0 && 0 <= yMax) {
    baselineDomain = 0;
  } else if (yMin > 0) {
    baselineDomain = yMin;
  } else if (yMax < 0) {
    baselineDomain = yMax;
  } else {
    baselineDomain = computeBaselineForBarsFromData(seriesConfigs);
  }

  let baselinePx = yScale.scale(baselineDomain);
  if (!Number.isFinite(baselinePx)) {
    baselineDomain = computeBaselineForBarsFromData(seriesConfigs);
    baselinePx = yScale.scale(baselineDomain);
  }
  if (!Number.isFinite(baselinePx)) {
    baselineDomain = 0;
    baselinePx = yScale.scale(0);
  }

  return { baselineDomain, baselinePx };
}

export function bucketStackedXKey(
  xCenterPx: number,