Compute edge doi/visibility only after all nodes are done

(commit robert-hoff@0e11399)

prefuse#33 reported that some edges were missing, if distance == 0. The missing
edges were edges to parents, which were already connected to other focus
nodes.

src/prefuse/action/filter/FisheyeTreeFilter.java

@@ -153,7 +153,13 @@ public void run(double frac) {
             VisualItem item = (VisualItem)items.next();
             if ( item.getDOI() == Constants.MINIMUM_DOI )
                 PrefuseLib.updateVisible(item, false);
-        }
+            else {
+                EdgeItem e =(EdgeItem) ((NodeItem)item).getParentEdge();
+            	if (e != null) {
+            		e.setDOI(item.getDOI());
+                    PrefuseLib.updateVisible(e, true);
+            	}
+            }
     }
 
     /**
@@ -175,12 +181,6 @@ private void visit(NodeItem n, NodeItem c, int doi, int ldist) {
         PrefuseLib.updateVisible(n, true);
         double localDOI = -ldist / Math.min(1000.0, m_divisor);
         n.setDOI(doi+localDOI);
-
-        if ( c != null ) {
-            EdgeItem e = (EdgeItem)c.getParentEdge();
-            e.setDOI(c.getDOI());
-            PrefuseLib.updateVisible(e, true);
-        }
     }
 
     /**