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

.. only:: html

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

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

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

.. _sphx_glr_gallery_other_plot_hover_neighborhood.py:


Hover neighborhoods
===================

This example shows how to highlight a node and its neighborhood by hovering with the mouse on it.

.. warning::
  This example will run in a Python, IPython, or Jupyter session, however the
  interactive functionality is not visible on the HTML page. Download the code
  at the end of this page and run it in a local Python environment to see
  the results.

.. GENERATED FROM PYTHON SOURCE LINES 13-84



.. image-sg:: /gallery/other/images/sphx_glr_plot_hover_neighborhood_001.png
   :alt: plot hover neighborhood
   :srcset: /gallery/other/images/sphx_glr_plot_hover_neighborhood_001.png
   :class: sphx-glr-single-img


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

 .. code-block:: none


    12





|

.. code-block:: Python


    import matplotlib.pyplot as plt
    import igraph as ig
    import iplotx as ipx

    g = ig.Graph.Erdos_Renyi(n=40, m=120)
    layout = g.layout()

    fig, axs = plt.subplots(1, 2, gridspec_kw={"width_ratios": [1, 0.2]}, figsize=(8, 6))
    art = ipx.network(
        g,
        layout=layout,
        ax=axs[0],
        aspect=1,
        vertex_zorder=5,
    )[0]
    base_nodecolors = art.get_vertices().get_facecolors()
    nodecolors = base_nodecolors.copy()
    edgecolors = art.get_edges().get_edgecolors()
    edgewidths = art.get_edges().get_linewidths()

    axs[1].set_axis_off()
    txt = axs[1].text(0.5, 0.5, "", ha="center", va="center", wrap=True,
                      fontsize=40)


    def hover_callback(event):
        """React to mouse hovering over vertices."""
        if event.inaxes == axs[0]:
            cont, ind = art.get_vertices().contains(event)

            # Reset everyone's color
            is_base = (nodecolors == base_nodecolors).all()

            # If mouse is over a vertex, change the color around there
            # and redraw
            if cont:
                i = ind["ind"][0]
                nodecolors[:] = [0, 0, 0, 0.3]
                nodecolors[g.neighbors(i)] = [1, 0, 0, 0.6]
                nodecolors[i] = [1, 0, 0, 1]
                art.get_vertices().set_facecolors(nodecolors)
                edgecolors[:] = [0, 0, 0, 0.3]
                edgecolors[g.incident(i)] = [0, 0, 0, 1]
                art.get_edges().set_edgecolors(edgecolors)
                edgewidths[:] = 1
                edgewidths[g.incident(i)] = 2
                art.get_edges().set_linewidths(edgewidths)

                txt.set_text(str(i))
            # Otherwise, change back to base and redraw
            elif not is_base:
                nodecolors[:] = base_nodecolors
                vertex_artist.set_facecolors(nodecolors)
                edgecolors[:] = [0, 0, 0, 1]
                art.get_edges().set_edgecolors(edgecolors)
                edgewidths[:] = 1
                art.get_edges().set_linewidths(edgewidths)
                txt.set_text("")
            # If nothing changed, no need to redraw
            else:
                return

            # Redraw if needed
            fig.canvas.draw_idle()


    fig.canvas.mpl_connect(
        "motion_notify_event",
        hover_callback,
    )


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

   **Total running time of the script:** (0 minutes 0.133 seconds)


.. _sphx_glr_download_gallery_other_plot_hover_neighborhood.py:

.. only:: html

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

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

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

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

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

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

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


.. only:: html

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

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