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Force Atlas 2 graph layout

Project description

ForceAtlas2 is a continuous graph layout algorithm for handy network visualization.

This implementation is based on this paper.

Warning: Some features (especially Prevent Overlapping) are not completely implemented. I’m waiting for your pull-requests.

Example of social graph rendered with force atlas 2 layout:

https://raw.githubusercontent.com/bosiakov/fa2l/master/_static/result.jpg

Installing

Supports Python 3.3+

Install from pip:

pip install fa2l

To build and install run from source:

python setup.py install

Usage

import networkx as nx
from fa2l import force_atlas2_layout
import matplotlib.pyplot as plt

G = nx.erdos_renyi_graph(100, 0.15, directed=False)

positions = force_atlas2_layout(G,
                                iterations=1000,
                                pos_list=None,
                                node_masses=None,
                                outbound_attraction_distribution=False,
                                lin_log_mode=False,
                                prevent_overlapping=False,
                                edge_weight_influence=1.0,

                                jitter_tolerance=1.0,
                                barnes_hut_optimize=True,
                                barnes_hut_theta=0.5,

                                scaling_ratio=2.0,
                                strong_gravity_mode=False,
                                multithread=False,
                                gravity=1.0)

nx.draw_networkx(G, positions, cmap=plt.get_cmap('jet'), node_size=50, with_labels=False)
plt.show()

Features

Force Atlas 2 features these settings:

  • Approximate Repulsion: Barnes Hut optimization: n² complexity to n.ln(n).
  • Gravity: Attracts nodes to the center. Prevents islands from drifting away.
  • Dissuade Hubs: Distributes attraction along outbound edges. Hubs attract less and thus are pushed to the borders.
  • LinLog mode: Switch ForceAtlas model from lin-lin to lin-log. Makes clusters more tight.
  • Prevent Overlap. WARNING! Does not work very well.
  • Tolerance: How much swinging you allow. Above 1 discouraged. Lower gives less speed and more precision.
  • Edge Weight Influence: How much influence you give to the edges weight. 0 is “no influence” and 1 is “normal”.

Documentation

You will find all the documentation in the source code

Project details


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