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

.. only:: html

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

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

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

.. _sphx_glr_gallery_event_handling_legend_picking.py:


==============
Legend Picking
==============

Enable picking on the legend to toggle the original line on and off

.. GENERATED FROM PYTHON SOURCE LINES 8-44



.. image:: /gallery/event_handling/images/sphx_glr_legend_picking_001.png
    :alt: Click on legend line to toggle line on/off
    :class: sphx-glr-single-img





.. code-block:: default


    import numpy as np
    import matplotlib.pyplot as plt


    t = np.linspace(0, 1)
    y1 = 2 * np.sin(2*np.pi*t)
    y2 = 4 * np.sin(2*np.pi*2*t)

    fig, ax = plt.subplots()
    ax.set_title('Click on legend line to toggle line on/off')
    line1, = ax.plot(t, y1, lw=2, label='1 Hz')
    line2, = ax.plot(t, y2, lw=2, label='2 Hz')
    leg = ax.legend(fancybox=True, shadow=True)

    lines = [line1, line2]
    lined = {}  # Will map legend lines to original lines.
    for legline, origline in zip(leg.get_lines(), lines):
        legline.set_picker(True)  # Enable picking on the legend line.
        lined[legline] = origline


    def on_pick(event):
        # On the pick event, find the original line corresponding to the legend
        # proxy line, and toggle its visibility.
        legline = event.artist
        origline = lined[legline]
        visible = not origline.get_visible()
        origline.set_visible(visible)
        # Change the alpha on the line in the legend so we can see what lines
        # have been toggled.
        legline.set_alpha(1.0 if visible else 0.2)
        fig.canvas.draw()

    fig.canvas.mpl_connect('pick_event', on_pick)
    plt.show()


.. _sphx_glr_download_gallery_event_handling_legend_picking.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: legend_picking.py <legend_picking.py>`



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

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


.. only:: html

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

    Keywords: matplotlib code example, codex, python plot, pyplot
    `Gallery generated by Sphinx-Gallery
    <https://sphinx-gallery.readthedocs.io>`_
