I want to allow the user to switch files, possibly changing the composition of
the scene, definitely needing updated surfaces to be displayed. I thought the
easiest solution would be to simply clear the scene and start again:
class Visualization(HasTraits):
...
@on_trait_change('surf_filename, cons_filename')
def update_data(self):
try:
if check_files(self.surf_filename, self.cons_filename):
self.update_plot()
...
def picker_callback(self, picker):
""" Picker callback: this get called when on pick events.
"""
print "Picking..."
...
@on_trait_change('scene.activated')
def update_plot(self):
print "Updating..."
self.scene.mlab.clf()
...
self.picker =
self.scene.mayavi_scene.on_mouse_pick(self.picker_callback)
self.picker.tolerance = 0.001
All is well for the first rendering of the scene: picker_callback() is getting
called appropriately, but when I subsequently call clf(), in the context of
update_data(), and rebuild the scene from the newly selected datasets my
callback no longer gets called. Note the default, 'p' activated, picker is
working.
Can anyone suggest what I might have done wrong? I was personally a little
suspicious about using a method instead of a plain function for picker_callback
but it worked, at least. until I started adding the change datasets feature.
--
Dave Flitney, IT Manager
Oxford Centre for Functional MRI of the Brain
E:[email protected] W:+44-1865-222713 F:+44-1865-222717
URL: http://www.fmrib.ox.ac.uk/~flitney
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