Draw an Undirected Graph

In this example we draw an undirected graph using the Fruchterman-Reingold layout. You must have matplotlib installed for this to work.

Start by importing the package

import jgrapht
import jgrapht.drawing.draw_matplotlib as drawing
import matplotlib.pyplot as plt

Creating a graph

g = jgrapht.create_graph(directed=False, weighted=True)

Add some vertices

for i in range(0,10):
    g.add_vertex()

and some edges

e1 = g.add_edge(0, 1)
e2 = g.add_edge(0, 2)
e3 = g.add_edge(0, 3)
e4 = g.add_edge(0, 4)
e5 = g.add_edge(0, 5)
e6 = g.add_edge(0, 6)
e7 = g.add_edge(0, 7)
e8 = g.add_edge(0, 8)
e9 = g.add_edge(0, 9)
e10 = g.add_edge(1, 2)

Compute the position of the vertices

positions = drawing.layout(g, seed=10, name="fruchterman_reingold")

Draw the graph using the vertex labels and the edge labels

vertex_labels = {v:v for v in g.vertices}
edge_labels = {e:e for e in g.edges}
drawing.draw_jgrapht(g, position=positions, vertex_labels=vertex_labels, edge_labels=edge_labels, axis=False)
plt.show()