Display the tree in a gaphical windows

Graphviz with a working -Txlib is expected Used for debugging

Property definitions

trees $ TreeMap :: show_dot
	# Display the tree in a gaphical windows
	# Graphviz with a working -Txlib is expected
	# Used for debugging
	fun show_dot is abstract
lib/trees/abstract_tree.nit:33,2--36,25

trees $ BinTreeMap :: show_dot
	redef fun show_dot do
		assert not_empty: root != null
		var f = new ProcessWriter("dot", "-Txlib")
		f.write "digraph \{\n"
		dot_down(root.as(not null), f)
		f.write "\}\n"
		f.close
	end
lib/trees/bintree.nit:342,2--349,4