[Jung-support] [Open Discussion] Change the shape of vertex

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The following forum message was posted by gthaha at http://sourceforge.net/projects/jung/forums/forum/252062/topic/4589885:

I have a problem dealing with the shape of the vertex. 

I use the following code to customize the shape of my vertex: 
 Transformer <String, Shape> vertextShape = new Transformer <String, Shape>()
		 {
			public Shape transform(String arg0) {
				if (change.contains(arg0))
				{
				        Point2D center = layout.transform(arg0);
					//System.out.println (center.toString());
					Shape shape = new Ellipse2D.Double(center.getX(), center.getY(), 20, 20);
					return shape;
				}
				return new Ellipse2D.Double(0,0,20,20);
			}
		 };

After I applied this code, the shape of vertex was changed. However, all the
vertex were moved from their original location. I guess the problem is that
the center point of the vertex is changed after the customized shape is applied.
Could any one give me a hint on how to solve it?

Thanks!