Function zoomIn

src/interaction/createZoomState.ts:247–258

(center, factor)

  };

  const zoomIn: ZoomState['zoomIn'] = (center, factor) => {
    if (!Number.isFinite(center) || !Number.isFinite(factor)) return;
    if (factor <= 1) return;

    const c = clamp(center, 0, 100);
    const span = end - start;
    const r = span === 0 ? 0.5 : clamp01((c - start) / span);
    const nextSpan = span / factor;
    const nextStart = c - r * nextSpan;
    const nextEnd = nextStart + nextSpan;
    applyNextRange(nextStart, nextEnd, { anchor: { center: c, ratio: r } });
  };

  const zoomOut: ZoomState['zoomOut'] = (center, factor) => {
    if (!Number.isFinite(center) || !Number.isFinite(factor)) return;