tkCanvasGraph is a Python library that implements a tkinter canvas on which users can display and manipulate graphs.

The documentation is available on http://tkCanvasgraph.readthedocs.io/.

A small example of its usage:

import tkinter
from tkCanvasGraph import CanvasFrame, Vertex, Edge
root = tkinter.Tk()
frame = CanvasFrame(root)
frame.pack(fill="both", expand=True)
v1 = Vertex(frame.canvas, label="vertex1")
frame.canvas.add_vertex(v1)
v2 = Vertex(frame.canvas, label="vertex2")
frame.canvas.add_vertex(v2)
edge = Edge(frame.canvas, v1, v2, label="edge")
frame.canvas.add_edge(edge)
root.mainloop()

It creates a new tkinter window, fills it with a CanvasFrame (a tkinter frame containing a tkCanvasGraph frame.canvas, but also buttons to apply layouts, and scrollbars), then add two vertices and one edge.

Another example is the tkCanvasGraph/__main__.py file:

python -m tkCanvasGraph

It opens a similar window with additional functionalities:

• new vertices can be created with CTRL + left click,
• new edges by maintaining CTRL and dragging and dropping the mouse from one vertex to another,
• elements can be deleted with CTRL + right click,
• labels can be modified by right-clicking on any element,
• "j" key will create a new vertex in a random position,
• "k" key will create a new edge between two vertices without an edge,
• "o" key will apply one step of the force based layout.

Look at the code to get more insight on how to use the library.