.. only:: html
.. note::
:class: sphx-glr-download-link-note
Click :ref:`here ` 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.
.. 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 `
.. container:: sphx-glr-download sphx-glr-download-jupyter
:download:`Download Jupyter notebook: image_slices_viewer.ipynb `
.. only:: html
.. rst-class:: sphx-glr-signature
Keywords: matplotlib code example, codex, python plot, pyplot
`Gallery generated by Sphinx-Gallery
`_