ShortestPathConnectionRouter使用的例子

public class Connection {
	
	static String layer1 = "layer1";
	static String layer2 = "layer2";
	
	public static void main(String args[]) {
		Shell shell = new Shell();
		shell.setSize(350, 350);
		shell.open();
		shell.setText("Connection Demo");
		LightweightSystem lws = new LightweightSystem(shell);
		LayeredPane manager = new LayeredPane();
		lws.setContents(manager);
		
		IFigure panel = new Layer();
		panel.setOpaque(false);
		manager.add(panel, layer1, -1);

		IFigure conLayer = new Layer();
		conLayer.setOpaque(false);
		manager.add(conLayer, layer2, -1);

		
		RectangleFigure node1 = new RectangleFigure(), node2 = new RectangleFigure();
		node1.setBackgroundColor(ColorConstants.red);
		node1.setBounds(new Rectangle(30, 30, 64, 36));
		
		RectangleFigure node3 = new RectangleFigure();
		node3.setBounds(new Rectangle(100, 100, 64, 36));

		node2.setBackgroundColor(ColorConstants.blue);
		node2.setBounds(new Rectangle(200, 200, 64, 36));

		PolylineConnection conn = new PolylineConnection();
		conn.setSourceAnchor(new ChopboxAnchor(node1));
		conn.setTargetAnchor(new ChopboxAnchor(node2));
		conn.setTargetDecoration(new PolygonDecoration());
		
//		conn.setConnectionRouter(new ManhattanConnectionRouter());		
		
		conn.setConnectionRouter(new ShortestPathConnectionRouter(panel));

		Label label = new Label("Midpoint");
		label.setOpaque(true);
		label.setBackgroundColor(ColorConstants.buttonLightest);
		label.setBorder(new LineBorder());

		// 添加连线的Locator
		conn.add(label, new MidpointLocator(conn, 0));

		// 在底层Figure中添加子Figure
		panel.add(node1);
		panel.add(node2);
		panel.add(node3);
		conLayer.add(conn);
		new Dragger(node1);
		new Dragger(node2);
		new Dragger(node3);
		
		Display display = Display.getDefault();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
	}

	static class Dragger extends MouseMotionListener.Stub implements MouseListener{
		private Point last;

		public Dragger(IFigure figure){
			figure.addMouseMotionListener(this);
			figure.addMouseListener(this);
		}

		public void mouseDoubleClicked(MouseEvent e) {
		}

		public void mousePressed(MouseEvent e) {
			last = e.getLocation();
		}

		public void mouseReleased(MouseEvent e) {
		}

		public void mouseDragged(MouseEvent e) {
			Point p = e.getLocation();
			Dimension delta = p.getDifference(last);
			last = p;
			Figure f = (Figure) e.getSource();
			//设置拖动的Figure的位置
			f.setBounds(f.getBounds().getTranslated(delta.width,delta.height));
		}
	}
}

 

使用 ShortestPathConnectionRouter需要使用多层次。这个使用了两层，一层是放置的node，一层放置的是连线。