# Draw a node from a `mentity`
	fun draw_node(mentity: MEntity): DotElement do
		if nodes.has_key(mentity) then return nodes[mentity]
		var node: DotElement = mentity.to_dot_node
		if mentity == center then node = highlight(node)
		nodes[mentity] = node
		graph.add node
		return node
	end