OpenLayers boundingExtent returns a single point

Question

I'm trying to zoom to a clicked cluster in OpenLayers in order to show polygons in that cluster.

const zoomToCluster = (cluster: Feature) => {
  const features = cluster.get('features')
  const extent = boundingExtent(
    features.map((f: any) => f.getGeometry().getFlatCoordinates())
  )
  viewRef.current.fit(extent,
    {duration: 1000, padding: [200, 200, 200, 200]}
  )
}

I did this similarly to an official example:

map.on('click', (e) => {
  clusters.getFeatures(e.pixel).then((clickedFeatures) => {
    if (clickedFeatures.length) {
      // Get clustered Coordinates
      const features = clickedFeatures[0].get('features');
      if (features.length > 1) {
        const extent = boundingExtent(
          features.map((r) => r.getGeometry().getCoordinates()),
        );
        map.getView().fit(extent, {duration: 1000, padding: [50, 50, 50, 50]});
      }
    }
  });
});

The problem is that clicking on a cluster with a single polygon will make boundingExtent return a point-sized extent instead of the expected extent around the polygon.

I have checked and getCoordinates() returns the correct coordinates of my polygon, but the result is an array of pairs, so I used getFlatCoordinates() instead.

OldDew · Accepted Answer · 2025-10-22 09:14:23Z

This is not an actual solution, but a workaround. I managed to get it working by simply not using boundingExtent() when I have a single polygon in a cluster:

const zoomToCluster = (cluster: Feature) => {
  const features = cluster.get('features')
  let extent: number[] = []

  if (features.length > 1) {
    extent = boundingExtent(
      features.map((f: any) => f.getGeometry().getFlatCoordinates())
    )
  } else if (features.length === 1) {
    extent = features[0].getGeometry().getExtent()
  }

  viewRef.current.fit(extent,
    {duration: 1000, padding: [200, 200, 200, 200]}
  )
}

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