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

.. only:: html

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

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

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

.. _sphx_glr__auto_examples_network_manipulation_plot_moving_nodes.py:


.. _editing_network_nodes:

Editing network geometry: Nodes
===============================

In this example, we show how to mode a node in the network and look into
what happens to the links.

.. GENERATED FROM PYTHON SOURCE LINES 11-14

.. admonition:: References

  * :ref:`modifications_on_nodes_layer` 

.. GENERATED FROM PYTHON SOURCE LINES 16-20

.. seealso::
    Several functions, methods, classes and modules are used in this example:

    * :func:`aequilibrae.project.network.Nodes`

.. GENERATED FROM PYTHON SOURCE LINES 22-31

.. code-block:: Python


    # Imports
    from uuid import uuid4
    from tempfile import gettempdir
    from os.path import join
    from aequilibrae.utils.create_example import create_example
    from shapely.geometry import Point
    import matplotlib.pyplot as plt








.. GENERATED FROM PYTHON SOURCE LINES 32-38

.. code-block:: Python


    # We create the example project inside our temp folder.
    fldr = join(gettempdir(), uuid4().hex)

    project = create_example(fldr)








.. GENERATED FROM PYTHON SOURCE LINES 39-40

Let's move node one from the upper left corner of the image above, a bit to the left and to the bottom.

.. GENERATED FROM PYTHON SOURCE LINES 40-51

.. code-block:: Python


    # We also add the node we want to move.
    all_nodes = project.network.nodes
    links = project.network.links
    node = all_nodes.get(1)
    new_geo = Point(node.geometry.x + 0.02, node.geometry.y - 0.02)
    node.geometry = new_geo

    # We can save changes for all nodes we have edited so far.
    node.save()








.. GENERATED FROM PYTHON SOURCE LINES 52-55

If you want to show the path in Python.

We do NOT recommend this, though.... It is very slow for real networks.

.. GENERATED FROM PYTHON SOURCE LINES 55-59

.. code-block:: Python


    # Let's refresh the links in memory for usage
    links.refresh()








.. GENERATED FROM PYTHON SOURCE LINES 60-61

Let's access our links data using a context manager instead of directly accessing the DataFrame.

.. GENERATED FROM PYTHON SOURCE LINES 61-72

.. code-block:: Python

    with project.db_connection as conn:
        link_ids = conn.execute("Select link_id from links;").fetchall()

    for lid in link_ids:
        geo = links.get(lid[0]).geometry
        plt.plot(*geo.xy, color="blue")

    plt.plot(*node.geometry.xy, "o", color="black")

    plt.show()




.. image-sg:: /_auto_examples/network_manipulation/images/sphx_glr_plot_moving_nodes_001.png
   :alt: plot moving nodes
   :srcset: /_auto_examples/network_manipulation/images/sphx_glr_plot_moving_nodes_001.png
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 73-75

Did you notice the links are matching the node?
Look at the original network and see how it used to look like.

.. GENERATED FROM PYTHON SOURCE LINES 77-78

.. code-block:: Python

    project.close()




.. rst-class:: sphx-glr-script-out

 .. code-block:: none

    This project at /tmp/10eb24081fa3421e8c63fb6f27f3c383 is already closed





.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.696 seconds)


.. _sphx_glr_download__auto_examples_network_manipulation_plot_moving_nodes.py:

.. only:: html

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

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

      :download:`Download Jupyter notebook: plot_moving_nodes.ipynb <plot_moving_nodes.ipynb>`

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

      :download:`Download Python source code: plot_moving_nodes.py <plot_moving_nodes.py>`

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

      :download:`Download zipped: plot_moving_nodes.zip <plot_moving_nodes.zip>`


.. only:: html

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

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