Function pan

examples/million-points/main.ts:314–318

(delta)

    const getRange: ZoomState['getRange'] = () => coordinator?.getZoomRange() ?? { start: 0, end: 100 };
    const setRange: ZoomState['setRange'] = (start, end) => coordinator?.setZoomRange(start, end);
    const pan: ZoomState['pan'] = (delta) => {
      const r = coordinator?.getZoomRange();
      if (!r || !Number.isFinite(delta)) return;
      coordinator?.setZoomRange(r.start + delta, r.end + delta);
    };
    const zoomIn: ZoomState['zoomIn'] = () => {
      // Not needed for slider UI; keep as a no-op for interface completeness.
    };