[SOLVED] Openlayers: Update clusters depending on filter (geometryFunction)

Openlayers: Update clusters depending on filter (geometryFunction)

I have a geojson and use openlayers to show features on a map. I cluster them. Now I want to add a filter to the UI, allowing users to filter the map depending on some feature properties.

      const vectorSource = new VectorSource({
        format: new GeoJSON(),
        url: this.dataSourceUrl,
      })

      const clusterSource = new Cluster({
        distance: 30,
        minDistance: 1,
        source: vectorSource,
        geometryFunction: (feature) => {
          if (feature.get('poles') < this.filter) {
            return feature.getGeometry()
          } else {
            return null
          }
        },
      })

      const styleCache = {}
      const clusterLayer = new VectorLayer({
        source: clusterSource,
        style: (feature) => {
          const size = feature.get('features')?.length
          let style = styleCache[size]
          if (!style) {
            style = new Style({
              image: new CircleStyle({
                radius: 10,
                stroke: new Stroke({
                  color: '#fff',
                }),
                fill: new Fill({
                  color: '#3399CC',
                }),
              }),
              text: new Text({
                text: size.toString(),
                fill: new Fill({
                  color: '#fff',
                }),
              }),
            })
            styleCache[size] = style
          }
          return style
        },
      })

      this.map.addLayer(clusterLayer)

whereas this.filter is just a number for now. If I update that filter, I want to redraw the clusters, but so far I am not successful.

First I thought I could use the changed() method of Cluster: https://openlayers.org/en/latest/apidoc/module-ol_source_Cluster-Cluster.html#changed

but it has no effect.

I found out how I can clear the clusters.

clusterSource.getSource().clear()

but that is really all. How can I update the clusters, now showing more or less feature points?

Thank you so much for your input!

Solution