#15 Support showing ClusteredPoint at centroid of all contained points instead of at initial point.

library/src/com/twotoasters/clusterkraf/ClusterPoint.java

@@ -12,6 +12,7 @@
  * due to pixel proximity
  */
 public class ClusterPoint extends BasePoint {
+	private static Options options;
 
 	private final ArrayList<InputPoint> pointsInClusterList = new ArrayList<InputPoint>();
 	private final HashSet<InputPoint> pointsInClusterSet = new HashSet<InputPoint>();
@@ -36,9 +37,23 @@ void add(InputPoint point) {
 		pointsInClusterList.add(point);
 		pointsInClusterSet.add(point);
 
+		if (options.isClusterShownAtCentroid()) {
+			mapPosition = getCenterLatLng();
+		}
+
 		boundsOfInputPoints = null;
 	}
 
+	private LatLng getCenterLatLng() {
+		LatLngBounds bounds = getBoundsOfInputPoints();
+		LatLng loc = new LatLng(avg(bounds.northeast.latitude, bounds.southwest.latitude), avg(bounds.northeast.longitude, bounds.southwest.longitude));
+		return loc;
+	}
+
+	private double avg(double a, double b) {
+		return (a + b) / 2;
+	}
+
 	ArrayList<InputPoint> getPointsInCluster() {
 		return pointsInClusterList;
 	}
@@ -92,4 +107,7 @@ LatLngBounds getBoundsOfInputPoints() {
 		return boundsOfInputPoints;
 	}
 
+	public static void setOptions(Options options) {
+		ClusterPoint.options = options;
+	}
 }

library/src/com/twotoasters/clusterkraf/Clusterkraf.java

@@ -51,6 +51,7 @@ public class Clusterkraf {
 	public Clusterkraf(GoogleMap map, Options options, ArrayList<InputPoint> points) {
 		this.mapRef = new WeakReference<GoogleMap>(map);
 		this.options = options;
+		ClusterPoint.setOptions(options);
 		this.innerCallbackListener = new InnerCallbackListener(this);
 		this.transitionsAnimation = new ClusterTransitionsAnimation(map, options, innerCallbackListener);
 

library/src/com/twotoasters/clusterkraf/Options.java

@@ -106,6 +106,13 @@ public class Options {
 	 * triggering cluster update processes.
 	 */
 	private long clusteringOnCameraChangeListenerDirtyLifetimeMillis = 200l;
+
+	/**
+	 * controls location of the cluster marker.  If true, it is shown at the center 
+	 * of the clustered points bounding box.  If false, it is shown on the default
+	 * location (which is a marker's location).
+	 */
+	private boolean showClusterOnCentroid = false;
 
 	/**
 	 * 
@@ -337,6 +344,14 @@ long getClusteringOnCameraChangeListenerDirtyLifetimeMillis() {
 	public void setClusteringOnCameraChangeListenerDirtyLifetimeMillis(long clusteringOnCameraChangeListenerDirtyLifetimeMillis) {
 		this.clusteringOnCameraChangeListenerDirtyLifetimeMillis = clusteringOnCameraChangeListenerDirtyLifetimeMillis;
 	}
+
+	public void setClusterShownAtCentroid(boolean showClusterOnCentroid) {
+		this.showClusterOnCentroid = showClusterOnCentroid;
+	}
+
+	public boolean isClusterShownAtCentroid() {
+		return showClusterOnCentroid;
+	}
 
 	ProcessingListener getProcessingListener() {
 		return processingListener;