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import numpy
from pylab import figure, show
class IndexTracker:
def __init__(self, ax, X):
self.ax = ax
ax.set_title('use scroll wheen 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 onscroll(self, event):
print event.button
if event.button=='up':
self.ind = numpy.clip(self.ind+1, 0, self.slices-1)
else:
self.ind = numpy.clip(self.ind-1, 0, self.slices-1)
self.update()
def update(self):
self.im.set_data(self.X[:,:,self.ind])
ax.set_ylabel('slice %s'%self.ind)
self.im.axes.figure.canvas.draw()
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)
show()
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