.. _pylab_examples-toggle_images: pylab_examples example code: toggle_images.py ============================================= .. plot:: /home/tcaswell/other_source/matplotlib/doc/mpl_examples/pylab_examples/toggle_images.py :: #!/usr/bin/env python """ toggle between two images by pressing "t" The basic idea is to load two images (they can be different shapes) and plot them to the same axes with hold "on". Then, toggle the visible property of them using keypress event handling If you want two images with different shapes to be plotted with the same extent, they must have the same "extent" property As usual, we'll define some random images for demo. Real data is much more exciting! Note, on the wx backend on some platforms (eg linux), you have to first click on the figure before the keypress events are activated. If you know how to fix this, please email us! """ from pylab import * # two images x1 is initially visible, x2 is not x1 = rand(100, 100) x2 = rand(150, 175) # arbitrary extent - both images must have same extent if you want # them to be resampled into the same axes space extent = (0,1,0,1) im1 = imshow(x1, extent=extent) im2 = imshow(x2, extent=extent, hold=True) im2.set_visible(False) def toggle_images(event): 'toggle the visible state of the two images' if event.key != 't': return b1 = im1.get_visible() b2 = im2.get_visible() im1.set_visible(not b1) im2.set_visible(not b2) draw() connect('key_press_event', toggle_images) show() Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)