import java.util.*;
import java.util.zip.*;
import java.util.List;
import java.util.regex.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.locks.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.table.*;
import java.io.*;
import java.net.*;
import java.lang.reflect.*;
import java.lang.ref.*;
import java.lang.management.*;
import java.security.*;
import java.security.spec.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.math.*;
import com.mxgraph.model.mxCell;
import com.mxgraph.util.mxPoint;
import com.mxgraph.view.mxGraph;
import com.mxgraph.util.mxCellRenderer;
import com.mxgraph.util.mxEvent;
import com.mxgraph.util.mxEventObject;
import com.mxgraph.util.mxEventSource.mxIEventListener;
public class main {


 // mxGraph


public static void main(final String[] args) throws Exception { Frame.main(args); }

/**
 * The frame example uses the graph model API to programmatically create
 * a graph image to be used as a background of a JComponent.
 */
static class Frame extends JFrame
{

	/**
	 * 
	 */
	private static final long serialVersionUID = -578683911307318455L;

	/**
	 * 
	 */
	private GraphControl graphControl;

	/**
	 * 
	 */
	public Frame()
	{
		super("mxGraph");

		// Creates graph with model
		mxGraph graph = new mxGraph();
		Object parent = graph.getDefaultParent();

		graph.getModel().beginUpdate();
		try
		{

			Object v1 = graph.insertVertex(parent, null, "Hello", 20, 20, 80,
					30);
			mxCell v2 = (mxCell) graph.insertVertex(parent, null, "World!",
					240, 150, 80, 30);
			Object e1 = graph.insertEdge(parent, null, "e1", v1, v2);

			mxCell v3 = (mxCell) graph.insertVertex(e1, null, "v3", -0.5, 0,
					40, 40, "shape=triangle");
			v3.getGeometry().setRelative(true);
			v3.getGeometry().setOffset(new mxPoint(-20, -20));
		}
		finally
		{
			graph.getModel().endUpdate();
		}

		// Creates a control in a scrollpane
		graphControl = new GraphControl(graph);
		JScrollPane scrollPane = new JScrollPane(graphControl);
		scrollPane.setAutoscrolls(true);

		// Puts the control into the frame
		getContentPane().setLayout(new BorderLayout());
		getContentPane().add(scrollPane, BorderLayout.CENTER);
		setSize(new Dimension(320, 200));
	}

	/**
	 * 
	 */
	public static void main(String[] args)
	{
		Frame frame = new Frame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
}



static class GraphControl extends JComponent {

	/**
	 * 
	 */
	private static final long serialVersionUID = -7470544285363165479L;

	mxGraph graph;

	Icon buffer;

	public GraphControl(mxGraph graph)
	{
		this.graph = graph;
		this.graph.getModel().addListener(mxEvent.CHANGE,
				new mxIEventListener()
				{
					public void invoke(Object source, mxEventObject evt)
					{
						GraphControl.this.graphModelChanged();
					}
				});
	}

	public mxGraph getGraph()
	{
		return graph;
	}

	public void paint(Graphics g)
	{
		super.paint(g);
		paintBuffer(g);

	}

	void paintBuffer(Graphics g)
	{
		Icon icon = getBuffer();
		icon.paintIcon(this, g, 0, 0);
	}

	public Icon getBuffer()
	{
		if (buffer == null)
		{
			updateBuffer();
		}
		return buffer;
	}

	protected void updateBuffer()
	{
		buffer = createBuffer();
		int width = buffer.getIconWidth() + 1;
		int height = buffer.getIconHeight() + 1;
		Dimension d = new Dimension(width, height);

		if (!getPreferredSize().equals(d))
		{
			setPreferredSize(d);
			revalidate();
		}
	}

	protected Icon createBuffer()
	{
		return new ImageIcon(mxCellRenderer.createBufferedImage(graph, null,
				graph.getView().getScale(), null, true, null));
	}

	protected void clearBuffer()
	{
		buffer = null;
	}

	public void refreshBuffer()
	{
		clearBuffer();
		repaint();
	}

	protected void graphModelChanged()
	{
		refreshBuffer();
	}

}

static void revalidate(Component c) {
  if (c == null || !c.isShowing()) return;
  // magic combo to actually relayout and repaint
  c.revalidate();
  c.repaint();
}

}