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Description:

phitigra 0.2.6

Phitigra

Phitigra is a graph editor widget for SageMath
when using the Jupyter notebook.

Try the demo notebook on mybinder!
Note: for some unknown reason the above link stopped working.
Features
With phitigra one can:

draw graphs using the mouse to add vertices and edges
move the vertices positions, zoom in and out
draw undirected as well as directed graphs
choose the color of vertices and edges
apply various layout algorithms
easily retrieve the drawn graph for use with SageMath
run step-by-step a custom script on the drawn graph
change and refresh the drawing with external functions

Non-features
The following are not supported:

multigraphs: multiple edges will not be drawn
large graphs: the rendering will be unpraticably slow

Dependencies

ipywidgets, for user interaction
ipycanvas, for the drawing

With jupyter, you might need the following
jupyter nbextension enable --py widgetsnbextension

after you install ipywidgets, and possibly more if using virtualenv and working in an activated virtual environment, see ipywidget's documentation for full details.
This is the first thing to check if the import of the package works fine but nothing shows when you try to display the widget.
With jupyterlab, the jupyterlab_widgets package is also required for the widget to show.
How to try it?
On mybinder
(Runs online, nothing to install.)
Note: for some unknown reason the link below stopped working.
Clicking here will open the demo notebook on mybinder in a new tab. Note that this uses the stable version of phitigra (that from the master branch), which may differ from the one in the develop branch.
From a standalone SageMath installation
This assumes that SageMath is installed on your system. See http://www.sagemath.org for install instructions.
Stable version
The stable version is on pypi so it can be installed as follows
sage -pip install --upgrade phitigra

Development version
Clone the source from the repository
git clone https://github.com/jfraymond/phitigra.git

Install or upgrade with pip:
sage -pip install --upgrade path/to/the/cloned/repository

That's it!
To uninstall:
sage -pip uninstall phitigra

Note that the above commands should not be run from the repository directory, otherwise pip might complain that it did not find files to uninstall.
Usage
from phitigra import GraphEditor
editor = GraphEditor(graphs.RandomGNP(10, 0.5))
editor.show()
# Now you can play with the graph!

A copy of the currently drawn graph can be obtained with the get_graph function:
G = editor.get_graph()
# Now G is a copy of the graph drawn in editor e

There are many more examples in the demo notebook.
Tests
As with SageMath's code, tests and code quality checks can be started with the --tox option (from the cloned directory):
sage --tox src/phitigra

Building the documentation
From the package directory
cd docs
sage -sh -c "make html"

The main file of the documentation is then in docs/build/html/index.html.
A recent build of the documentation can be found here.
What's new
v0.2.6

Minor change to adapt to the new ipycanvas; this version will not work with ipycanvas < 0.12.0

v0.2.5

Minor fixes in the documentation
Fixed an issue when building the documentation

v0.2.4

Show/hide edge labels
User-defined vertex labels
Exposing vertex positioning functions
Removing the Next button
Updating links after move to github
More examples in the demo notebook

v0.2.3

Improved doc
Polished code, which now passes all tests
Changed package structure to follows python guidelines

v0.2.2

Single (major) change: renaming SimpleGraphEditor into GraphEditor. Code written for previous versions is not compatible with this one, but can be easily fixed.

v0.2.1

Demo notebook
Binder link
Improved update time when moving vertices
Minor fixes

v0.2.0

Docstrings and doctests in (almost) all functions
Hiding of internal objects
Cleaning code