Jurij

A simple Python application for drawing graphs, useful for teaching and experiments.

To run the program, start gui.py from command line or the Python IDLE interface.

The program files are as follows:

• jurij.py is the main program which just starts the application
• jurij/__init__.py just imports everything else in jurij
• jurij/graph.py the graph data structure and basic operations
• jurij/group.py finitely-generated groups (used for Cayley graphs)
• jurij/library.py basic graphs
• jurij/view.py a simple graph viewer with a spring embedder

How to use the graph viewer

To draw a graph, enter its Python definition in the input field and press the Draw! button. Examples of definitions:

• cycle(5)
• path(30)
• complete_graph(7)
• cone(cycle(10))
• product(path(3), cycle(4))
• igraph(5,2,1)
• cayley_graph(symmetric_group(4))
• cayley_graph(Group([1,2], operation=(lambda x,y: (x+y)%13)))
• cayley_graph(permutation_group([(1,0,2,3), (0,3,1,2)]))

You can also enter a specific graph by giving a list of edges or an adjancency dictionary, for example:

  [(1,2), (2,3), (2,4), (3,4)]

or

  {1 : [2], 2 : [3,4], 3 : [4], 4 : []}

For further information on what is available see the modules jurij.graph, jurij.group and jurij.library.