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

.. only:: html

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

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

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

.. _sphx_glr_gallery_event_handling_image_slices_viewer.py:


===================
Image Slices Viewer
===================

Scroll through 2D image slices of a 3D array.

.. GENERATED FROM PYTHON SOURCE LINES 8-52



.. image:: /gallery/event_handling/images/sphx_glr_image_slices_viewer_001.png
    :alt: use scroll wheel to navigate images
    :class: sphx-glr-single-img





.. code-block:: default


    import numpy as np
    import matplotlib.pyplot as plt


    # Fixing random state for reproducibility
    np.random.seed(19680801)


    class IndexTracker:
        def __init__(self, ax, X):
            self.ax = ax
            ax.set_title('use scroll wheel to navigate images')

            self.X = X
            rows, cols, self.slices = X.shape
            self.ind = self.slices//2

            self.im = ax.imshow(self.X[:, :, self.ind])
            self.update()

        def on_scroll(self, event):
            print("%s %s" % (event.button, event.step))
            if event.button == 'up':
                self.ind = (self.ind + 1) % self.slices
            else:
                self.ind = (self.ind - 1) % self.slices
            self.update()

        def update(self):
            self.im.set_data(self.X[:, :, self.ind])
            self.ax.set_ylabel('slice %s' % self.ind)
            self.im.axes.figure.canvas.draw()


    fig, ax = plt.subplots(1, 1)

    X = np.random.rand(20, 20, 40)

    tracker = IndexTracker(ax, X)


    fig.canvas.mpl_connect('scroll_event', tracker.on_scroll)
    plt.show()


.. _sphx_glr_download_gallery_event_handling_image_slices_viewer.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: image_slices_viewer.py <image_slices_viewer.py>`



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

     :download:`Download Jupyter notebook: image_slices_viewer.ipynb <image_slices_viewer.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>`_
