public void Layout(HierarchicalData root, double actualWidth, double actualHeight)
{
// actualWidth and actualHeight are not used. We render the circles independent of the sizes and scale them later.
// Counters over all steps
DebugHelper.ResetDbgCounter();
// Cleanup previous layouting
root.TraverseTopDown(x => x.Layout = null);
Layout(root);
// Center root node to screen. Move to (0,0)
var rootLayout = GetLayout(root);
MoveCircles(root, -(Vector)rootLayout.Center);
ApplyPendingMovements(root);
}