[OpenLayers-Dev] Problem with cluster strategy

[Jerome Freyre]

Hi everybody,

In my project, I currently use the cluster strategy.

In the example
http://dev.openlayers.org/sandbox/vector-behavior/examples/strategy-cluster.html

we use a little formula in the context to define the radius :
Math.min(feature.attributes.count, 7) + 3;

Personnally, I am not sure that it is the right way to define the radius
size of the cluster.

Normally, the radius should be defined by the "max value of all cluster" and
the "max radius we autorize"!?

Personally, I add a function in the Cluster.js file which is called before
the this.layer.addFeatures(clusters) in the cluster function :

    getBiggestClusterValue: function(clusters) {
      
      if (this.maxVal == -1) {
      
        if(clusters) {
          for(var i=0; i<clusters.length; ++i) {
              if (clusters[i].attributes.count > this.maxVal)
                this.maxVal =
clusters[i].attributes[this.AttributeUsedToCount];
           }
        }  
        return this.maxVal;
      }
      else
      return this.maxVal;      
    }, 

And in the context, I use this formula to determine the radius

var maxClustersValue = parseInt(clusterStrategy.maxVal);
var maxRadius = 18;
var currentClusterValue = feature.attributes.nbOfSpams;
var radius = Math.ceil(currentClusterValue * (maxRadius /
maxClustersValue));
return Math.max(2,radius);


Is my reflexion correct? 

Thanks all,
Jérome


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