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

.. only:: html

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

        Click :ref:`here <sphx_glr_download__auto_examples_plot_moving_link_extremity.py>`
        to download the full example code

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

.. _sphx_glr__auto_examples_plot_moving_link_extremity.py:


Editing network geometry: Links
===============================

On this example we move a link extremity from one point to another
and see what happens to the network

.. GENERATED FROM PYTHON SOURCE LINES 8-22

.. 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 LineString, Point
    import matplotlib.pyplot as plt

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

    project = create_example(fldr)








.. GENERATED FROM PYTHON SOURCE LINES 23-44

.. code-block:: python

    all_nodes = project.network.nodes
    links = project.network.links

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

    # We edit the link that goes from node 1 to node 2
    link = links.get(1)
    node = all_nodes.get(1)
    new_extremity = Point(node.geometry.x + 0.02, node.geometry.y - 0.02)
    link.geometry = LineString([node.geometry, new_extremity])

    # and the link that goes from node 2 to node 1
    link = links.get(3)
    node2 = all_nodes.get(2)
    link.geometry = LineString([new_extremity, node2.geometry])

    links.save()
    links.refresh()

    # Because each link is unidirectional, you can no longer go from node 1 to node 2, obviously








.. GENERATED FROM PYTHON SOURCE LINES 45-47

We do NOT recommend this, though....  It is very slow for real networks
We plot the entire network

.. GENERATED FROM PYTHON SOURCE LINES 47-67

.. code-block:: python

    curr = project.conn.cursor()
    curr.execute('Select link_id from links;')

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

    all_nodes = project.network.nodes
    curr = project.conn.cursor()
    curr.execute('Select node_id from nodes;')

    for nid in curr.fetchall():
        geo = all_nodes.get(nid[0]).geometry
        plt.plot(*geo.xy, 'ro', color='black')

    plt.show()

    # Now look at the network how it used to be





.. image-sg:: /_auto_examples/images/sphx_glr_plot_moving_link_extremity_001.png
   :alt: plot moving link extremity
   :srcset: /_auto_examples/images/sphx_glr_plot_moving_link_extremity_001.png
   :class: sphx-glr-single-img


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

 Out:

 .. code-block:: none

    /home/runner/work/aequilibrae/aequilibrae/docs/source/examples/plot_moving_link_extremity.py:60: UserWarning: color is redundantly defined by the 'color' keyword argument and the fmt string "ro" (-> color='r'). The keyword argument will take precedence.
      plt.plot(*geo.xy, 'ro', color='black')




.. GENERATED FROM PYTHON SOURCE LINES 68-69

.. code-block:: python

    project.close()








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

   **Total running time of the script:** ( 0 minutes  0.719 seconds)


.. _sphx_glr_download__auto_examples_plot_moving_link_extremity.py:


.. only :: html

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



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

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



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

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


.. only:: html

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

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