Cluster Location limitation and Bounds bug

[Magnus]

It seems like there's a limitation to Cluster locations and a bug regarding its Bounds. I noticed that the location of a Cluster is always at the location of the first item added to it. I would expect that it actually would be at the center of all added items. Looking at the ClusterData.Add method it seems like it would be easy to update the Cluster-location there since the bounds are updated each time a new item is added. I tried solving it by overriding the DefaultClusterGenerator like the code below, but then I noticed that the calculation for the Bounds are actually wrong in the ClusterData.Add method. The last Math.Min should be a Math.Max. In the end I had to calculate the Bounds myself, and then update the Cluster Location.

 

public class ClusterGenerator : DefaultClusterGenerator

{
    public override ClusterData CreateCluster(Location center, object item)
    {
        var clusterData = base.CreateCluster(center, item);
        clusterData.AutoCalculateBounds = true;

        clusterData.PropertyChanged += this.ClusterDataOnPropertyChanged;
        return clusterData;
    }

    private void ClusterDataOnPropertyChanged(object sender, PropertyChangedEventArgs args)
    {
        // Check if an item has been added or removed
        if (args.PropertyName == nameof(ClusterData.Count))
        {
            var clusterData = sender as ClusterData;
            if (!clusterData.Bounds.IsEmpty)
            {
                clusterData.Location = clusterData.Bounds.Center;
            }
        }
    }
}

[Dinko | Tech Support Engineer]

Hello Magnus,

Thank you for the provided code snippet.

I am currently investigating this behavior. I will contact you again as soon as I have more information about your case.

Regards,
Dinko
Progress Telerik

[Petar Mladenov]

Hello Magnus,

We understand your requirement for the center of the cluster. This is a valid request and you can submit it in our feedback portal. To be honest, we need to evaluate the performance and the behavior of the cluster if we change the way its Location is calculated. As for the Bounds, we managed to isolate the issue and a fix for it will be available in the in the build next week. We logged it in our portal and increased your telerik account points as thanks for your cooperation.

Regards,
Petar Mladenov
Progress Telerik