!7

lib 1007175 // mxGraph

import com.mxgraph.model.mxCell;

import com.mxgraph.util.mxPoint;

import com.mxgraph.view.mxGraph;

p { 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);

	}

}

import com.mxgraph.util.mxCellRenderer;

import com.mxgraph.util.mxEvent;

import com.mxgraph.util.mxEventObject;

import com.mxgraph.util.mxEventSource.mxIEventListener;

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();

	}

}