Function pan

src/ChartGPU.ts:724–729

(delta)

      coordinator?.setZoomRange(nextStart, nextStart + nextSpan);
    };
    const pan: ZoomState['pan'] = (delta) => {
      if (!Number.isFinite(delta)) return;
      const r = coordinator?.getZoomRange();
      if (!r) return;
      coordinator?.setZoomRange(r.start + delta, r.end + delta);
    };
    const onChange: ZoomState['onChange'] = (callback) => coordinator?.onZoomRangeChange(callback) ?? (() => {});

    return { getRange, setRange, zoomIn, zoomOut, pan, onChange };