Find a VisualItem directly

In order to find a VisualItem in prefuse Visualization, there are two ways.

#1 The general way is to get an Iterator by calling Visualization class' item(), getGroup(), or other methods, which will return an Iterator. Then in a while loop, query this Iterator one by one and search for the VisualItem with certain contents.

Iterator i= v.items(SOURCE);

VisualItem vitem, v1=null, v2=null;

while(i.hasNext()){

vitem=(VisualItem) i.next();

if (vitem instanceof VisualItem){

if (vitem.getInt("ID")==s){

v1=vitem;

}

if (vitem.getInt("ID")==t){

v2=vitem;

}

}

}

#2 A specific way is to cast the TupleSet into a VisualTable if your back up data is a Table. So in this way, the VisualItem can be directly queried by using the row number.

VisualTable ts=(VisualTable) v.getGroup(SOURCE);

VisualItem v1=ts.getItem(s-1);

VisualItem v2=ts.getItem(t-1);

The speed of #2 is much fast than #1. Using this solution, it is easy to handle ~10000 nodes and lines.

But #1 is safe, since if your backup data is not a Table, there may be an exception of casting TupleSet into VisualTable.

If your data nodes is small, ~1000, #1 solution would be safe to use. If you want speed, use #2 with careful data design.