In .NET you would do that using compound pens, but it seems they don't have equivalent in Java. Instead, you could set node.CustomDraw to CustomDraw.Additional to draw a second border from the drawNode event handler:

public void drawNode(DrawNodeEvent e)
{
	Rectangle2D rect = e.getBounds();
	rect.setFrame(
			rect.getMinX() + 1,
			rect.getMinY() + 1,
			rect.getWidth() - 2,
			rect.getHeight() -2);

	Graphics2D g = e.getGraphics();
	e.getNode().getPen().applyTo(g);
	g.draw(rect);
} 

I hope that helps,
Stoyan

You can derive from Pen and set your custom stroke from the applyTo method.

class MyPen extends Pen
{
	@Override
	public void applyTo(Graphics2D g)
	{
		g.setStroke(new CompositeStroke(
			new BasicStroke(getWidth()),
			new BasicStroke(getWidth() / 4)));
		g.setPaint(getColor());
	}
}

public void nodeCreated(NodeEvent e)
{
	MyPen pen = new MyPen();
	pen.setWidth(3);
	e.getNode().setPen(pen);
	// ...
} 

The sample CompositeStroke from that page doesn't look that great when applied to anything more complex than a simple line or curve though.

Stoyan

Here's a stroke class that works fine for most shapes:
http://mindfusion.eu/_samples/DoubleStroke.txt



It ignores open figures in the shape and paints them as single lines. There are open figures drawn by ShapeNodes whose shapes contain decoration lines. You can replace the addPolygon(openFigure, result, false) line with something similar to the CompositeStroke.createStrokedShape implementation to add double lines for open figures.

I hope that helps,
Stoyan