Hardworking Strawberry

1. Set Label Size
　Iterator iter = vis.items("graph.nodes");
　while ( iter.hasNext() ) {
　　　VisualItem item = (VisualItem)iter.next();
　　　item.setSize(4)
　}

2. Read Data
　Iterator iter = vis.items("graph.nodes");
　while ( iter.hasNext() ) {
　　　VisualItem item = (VisualItem)iter.next();
　　　double tw = item.getDouble("weight");
　}