double factor = 2.0*(double)maxCard /
((double)params.numEdges*
Math.sin(2.0*Math.PI/(double)params.numEdges))/(radius*radius);
VennObjectFactory factory = new VennObjectFactory();
factory.setPolygonParameters( params.numEdges, factor );
setLayout(new GridLayout(1,models.length));
arrangements = new VennArrangement[models.length];