Graph animation problem

[Stephen Andrasi <andristv94 AT gmail.com>]

Hi, my name is Stephen.

I'm working on a project where my task is to make a graph algorithm 
visualizer.

I have a Jbutton at the bottom of the window and above it there is the graph.
I have an "Animate" button to start the algorithm on the graph, but it does 
not
work.

I want to draw the edges step by step. (I added a little pause)
What am I doing wrong? :( 



public class EZ{
private static Graph graph = new SingleGraph("Graph");

public static class MyFrame extends JFrame
{
    private Viewer viewer = new
Viewer(graph,Viewer.ThreadingModel.GRAPH_IN_GUI_THREAD);
    private View view = viewer.addDefaultView(false);
    private JButton button = new JButton("ASD");
        public ViewerPipe pipe = viewer.newViewerPipe();
    
    public MyFrame()
    {
    
        graph.addAttribute("ui.stylesheet", "url('src/style/graph.css')");
        viewer.enableAutoLayout();
        setLayout(new BorderLayout());
        add((Component) view,BorderLayout.CENTER);
        add(button, BorderLayout.AFTER_LAST_LINE);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                
                        graph.getNode("A").setAttribute("ui.class", 
"walking");
                        pipe.pump();
                        long start = new Date().getTime();   // small pause 
                        while(new Date().getTime() - start < 1000L){}

                        graph.getNode("A").setAttribute("ui.class", 
"walking");
                        pipe.pump();
            }
        });
    }
}

public static void main(String args[])
{
    SwingUtilities.invokeLater(new Runnable() 
    {

        public void run() {

            graph.addNode("A").setAttribute("ui.label", "A");
            graph.addNode("B").setAttribute("ui.label", "B");
            graph.addNode("C").setAttribute("ui.label", "C");
            graph.addEdge("AB", "A", "B").setAttribute("ui.label", "1");
            graph.addEdge("BC", "B", "C").setAttribute("ui.label", "6");
            graph.addEdge("CA", "C", "A").setAttribute("ui.label", "2");
            
            MyFrame frame = new MyFrame();
            frame.setSize(500, 500);
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        }
    });
}
}


Greetings,
Stephen