def test_global_disable_update(self):
# Given
p = Prop()
vp = tvtk_base.deref_vtk(p)
# When
with tvtk_base.global_disable_update():
vp.SetOpacity(0.5)
vp.Modified()
# Then
self.assertEqual(p.opacity, 1.0)
# When
vp.SetOpacity(0.4)
# Then
self.assertEqual(p.opacity, 0.4)
def test_global_disable_update(self):
# Given
p = Prop()
vp = tvtk_base.deref_vtk(p)
# When
with tvtk_base.global_disable_update():
vp.SetOpacity(0.5)
vp.Modified()
# Then
self.assertEqual(p.opacity, 1.0)
# When
vp.SetOpacity(0.4)
# Then
self.assertEqual(p.opacity, 0.4)
def call_rwi(self, method, *args):
if method == 'SetSize':
# This is an issue with the way TVTK is setup and how VTK resizes
# an offscreen window. It basically releases all graphics resources
# and this job is passed on to the various mappers. When the mapper
# does this it emits a ModifiedEvent which is picked by TVTK to
# fire a render. This call to render when the window is resizing
# locks up VTK or entirely messes up the rendering. I've reported
# this upstream but it turns out that disabling the auto updates in
# TVTK maybe of general use so we have a convenient context manager
# to do this called `global_disable_update` that shuts off the
# automatic updates for ALL TVTK objects for a brief while. This
# fixes the issue.
with global_disable_update():
self.trw.size = args
self.trw.render()
if 'PressEvent' in method:
self.image_encoder.compress = True
if 'ReleaseEvent' in method:
self.image_encoder.compress = False
getattr(self.rwi, method)(*args)
def call_rwi(self, method, *args):
if method == 'SetSize':
# This is an issue with the way TVTK is setup and how VTK resizes
# an offscreen window. It basically releases all graphics resources
# and this job is passed on to the various mappers. When the mapper
# does this it emits a ModifiedEvent which is picked by TVTK to
# fire a render. This call to render when the window is resizing
# locks up VTK or entirely messes up the rendering. I've reported
# this upstream but it turns out that disabling the auto updates in
# TVTK maybe of general use so we have a convenient context manager
# to do this called `global_disable_update` that shuts off the
# automatic updates for ALL TVTK objects for a brief while. This
# fixes the issue.
with global_disable_update():
self.trw.size = args
self.trw.render()
if 'PressEvent' in method:
self.image_encoder.compress = True
if 'ReleaseEvent' in method:
self.image_encoder.compress = False
getattr(self.rwi, method)(*args)