.package(url: "https://github.com/vospennikov/ClusterMap.git", from: "1.1.0")

let clusterManager = ClusterManager()

let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2D(latitude: 21.283921, longitude: -157.831661)
manager.add(annotation)

extension ViewController: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        if let annotation = annotation as? ClusterAnnotation {
            return CountClusterAnnotationView(annotation: annotation, reuseIdentifier: "cluster")
        } else {
            return MKPinAnnotationView(annotation: annotation, reuseIdentifier: "pin")
        }
    }
}

class CountClusterAnnotationView: ClusterAnnotationView {
    override func configure(_ annotation: ClusterAnnotation) {
        super.configure(annotation)
        layer.borderColor = UIColor.white.cgColor
        layer.borderWidth = 1.5
    }
}

manager.remove(annotation)

func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
    clusterManager.reload(mapView: mapView) { finished in
        // handle completion
    }
}

var zoomLevel: Double // The current zoom level of the visible map region.
var maxZoomLevel: Double // The maximum zoom level before disabling clustering.
var minCountForClustering: Int // The minimum number of annotations for a cluster. The default is `2`.
var shouldRemoveInvisibleAnnotations: Bool // Whether to remove invisible annotations. The default is `true`.
var shouldDistributeAnnotationsOnSameCoordinate: Bool // Whether to arrange annotations in a circle if they have the same coordinate. The default is `true`.
var distanceFromContestedLocation: Double // The distance in meters from contested location when the annotations have the same coordinate. The default is `3`.
var clusterPosition: ClusterAlignment // The position of the cluster annotation. The default is `.nearCenter`.

// The size of each cell on the grid at a given zoom level.
func cellSize(for zoomLevel: Double) -> Double? { ... }

// Whether to cluster the given annotation.
func shouldClusterAnnotation(_ annotation: MKAnnotation) -> Bool { ... }