.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "auto_openfpga_tiling/01_netlist_to_graph.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_auto_openfpga_tiling_01_netlist_to_graph.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_openfpga_tiling_01_netlist_to_graph.py:


==============================
Netlist to graph (networkx)
==============================

This example demonstrate how to convert a netlist to a netowrkx graph.

By default each node is assigned weight 1 and each edge is assigned weight 
based on how many wires it represents. In case of bus connected single edge
with weight equal to length of bus is assigned.

**Graph representation**

.. image:: ../../../examples/OpenFPGA_tiling/_nx_graph.svg
    :align: center
    :width: 40% 

.. GENERATED FROM PYTHON SOURCE LINES 18-39

.. code-block:: Python


    import matplotlib.pyplot as plt
    import networkx as nx
    import spydrnet as sdn
    import spydrnet_physical as sdnphy
    from networkx.drawing.nx_pydot import to_pydot

    netlist = sdnphy.load_netlist_by_name('basic_hierarchy')

    top: sdn.Netlist = netlist.top_instance.reference
    graph = top.get_connectivity_network()
    nodes = graph.nodes
    graph_dot = to_pydot(graph)
    graph_dot.write_svg('_nx_graph.svg')

    print(" ========== Nodes ==========")
    print("\n".join([f"{node:2} {nodes[node]['label']:15} {nodes[node]}"
                     for node in nodes]))
    print(" ========== Edges ==========")
    print("\n".join(nx.generate_edgelist(graph, data=True)))


.. GENERATED FROM PYTHON SOURCE LINES 40-45

**Regenerated graph with ports splits into individual nodes**

.. image:: ../../../examples/OpenFPGA_tiling/_nx_graph_split.svg
    :align: center
    :width: 50%

.. GENERATED FROM PYTHON SOURCE LINES 45-56

.. code-block:: Python


    graph = top.get_connectivity_network(split_ports=True)
    nodes = graph.nodes
    graph_dot = to_pydot(graph)
    graph_dot.write_svg('_nx_graph_split.svg')

    print(" ========== Nodes ==========")
    print("\n".join([f"{node:2} {nodes[node]['label']:15} {nodes[node]}"
                     for node in nodes]))
    print(" ========== Edges ==========")
    print("\n".join(nx.generate_edgelist(graph, data=True)))


.. _sphx_glr_download_auto_openfpga_tiling_01_netlist_to_graph.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: 01_netlist_to_graph.ipynb <01_netlist_to_graph.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: 01_netlist_to_graph.py <01_netlist_to_graph.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: 01_netlist_to_graph.zip <01_netlist_to_graph.zip>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_