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pylab_examples example code: image_slices_viewer.pyΒΆ

(Source code, png, hires.png, pdf)

from __future__ import print_function
import numpy
from matplotlib.pyplot import figure, show

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

        self.X = X
        rows,cols,self.slices = X.shape
        self.ind  = self.slices/2 = ax.imshow(self.X[:,:,self.ind])

    def onscroll(self, event):
        print ("%s %s" % (event.button, event.step))
        if event.button=='up':
            self.ind = numpy.clip(self.ind+1, 0, self.slices-1)
            self.ind = numpy.clip(self.ind-1, 0, self.slices-1)


    def update(self):[:,:,self.ind])
        ax.set_ylabel('slice %s'%self.ind)

fig = figure()
ax = fig.add_subplot(111)

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

tracker = IndexTracker(ax, X)

fig.canvas.mpl_connect('scroll_event', tracker.onscroll)

Keywords: python, matplotlib, pylab, example, codex (see Search examples)