def _button_make_animation_fired(self):
        view = mlab.view()
        roll = mlab.roll()

##         if self.anim_process and self.anim_process.is_alive():
##             output('terminating previous animation process...')
##             self.anim_process.terminate()
##             output('...done')

##         output('starting animation process...')
##         self.anim_process = Process(target=make_animation,
##                                     args=(self.viewer.filename,
##                                           view[:2],
##                                           roll,
##                                           Struct(**self.viewer.options)))
##         self.anim_process.daemon = True
##         self.anim_process.start()
##         output('...done')

        make_animation(self.viewer.filename,
                       view,
                       roll,
                       'avi',
                       Struct(**self.viewer.options),
                       self.viewer)

 def _button_view_fired(self):
     self.scene.camera.print_traits()
     view = mlab.view()
     roll = mlab.roll()
     print 'view:', view
     print 'roll:', roll
     print 'as args: --view=%.2e,%.2e,%.2e,%.2e,%.2e,%.2e --roll=%.2e' \
           % (view[:3] + tuple(view[3]) + (roll,))

    def _button_make_snapshots_fired(self):
        view = mlab.view()
        roll = mlab.roll()

        make_animation(self.viewer.filename,
                       view,
                       roll,
                       'png',
                       Struct(**self.viewer.options),
                       self.viewer)

    def _button_make_snapshots_times_fired(self):
        view = mlab.view()
        roll = mlab.roll()

        times = nm.arange(self.set_step.seq_t0,
                          self.set_step.seq_t1 + 0.01 * self.set_step.seq_dt,
                          self.set_step.seq_dt, dtype=nm.float64)
        make_animation(self.viewer.filename,
                       view, roll, 'png',
                       Struct(**self.viewer.options), times=times,
                       reuse_viewer=self.viewer)

    def _button_make_snapshots_steps_fired(self):
        view = mlab.view()
        roll = mlab.roll()

        steps = nm.arange(self.set_step.seq_start,
                          self.set_step.seq_stop,
                          self.set_step.seq_step, dtype=nm.int32)
        make_animation(self.viewer.filename,
                       view, roll, 'png',
                       Struct(**self.viewer.options), steps=steps,
                       reuse_viewer=self.viewer)

 def reset_view(self):
     mlab.view(*self.view)
     mlab.roll(self.roll)
     self.scene.scene.camera.zoom(1.0)

 def _button_view_fired(self):
     self.scene.camera.print_traits()
     print 'view:', mlab.view()
     print 'roll:', mlab.roll()