g.Nodes.Sort(EntropyOrder)
	case cum:
		g.Nodes.Sort(CumNameOrder)
	default:
		g.Nodes.Sort(FlatNameOrder)
	}
}

// SelectTopNodePtrs returns a set of the top maxNodes *Node in a graph.
func (g *Graph) SelectTopNodePtrs(maxNodes int, visualMode bool) NodePtrSet {
	set := make(NodePtrSet)
	for _, node := range g.selectTopNodes(maxNodes, visualMode) {
		set[node] = true
	}
	return set

		// Remove low frequency tags and edges as they affect selection.
		g.TrimLowFrequencyTags(nodeCutoff)
		g.TrimLowFrequencyEdges(edgeCutoff)
		if callTree {
			if nodesKept := g.SelectTopNodePtrs(nodeCount, visualMode); len(g.Nodes) != len(nodesKept) {
				g.TrimTree(nodesKept)
				g.SortNodes(cumSort, visualMode)
			}
		} else {