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# Author: Suyog Dutt Jain <suyog.jain@aero.iitb.ac.in>
# Prabhu Ramachandran <prabhu_r@users.sf.net>
# Copyright (c) 2008-2020, Enthought, Inc.
# License: BSD Style.
# Standard library imports.
from os.path import abspath
from io import BytesIO
import copy
import unittest
# Enthought library imports
from mayavi.core.null_engine import NullEngine
from mayavi.filters.optional import Optional
from mayavi.filters.user_defined import UserDefined
from mayavi.filters.api import (CellToPointData, ExtractVectorNorm, ExtractVectorComponents)
from mayavi.modules.api import ScalarCutPlane
from mayavi.sources.vtk_xml_file_reader import VTKXMLFileReader
from tvtk.api import tvtk
# Local imports.
from mayavi.tests.common import get_example_data
class TestUserDefined(unittest.TestCase):
def setUp(self):
"""Initial setting up of test fixture, automatically called by TestCase before any other test method is invoked"""
e = NullEngine()
# Uncomment to see visualization for debugging etc.
#e = Engine()
e.start()
e.new_scene()
self.e=e
# Read a VTK (old style) data file.
r = VTKXMLFileReader()
r.initialize(get_example_data('pyramid_ug.vtu'))
e.add_source(r)
# Create the filters.
# CellDerivatives
cd = tvtk.CellDerivatives()
ud = UserDefined(filter=cd)
e.add_filter(ud)
ctp = CellToPointData()
ctp.filter.pass_cell_data = False
e.add_filter(ctp)
evn = ExtractVectorNorm()
e.add_filter(evn)
evc = ExtractVectorComponents(component='y-component')
o = Optional(filter=evc)
e.add_filter(o)
e.add_module(ScalarCutPlane())
self.scene = e.current_scene
s = self.scene
return
def tearDown(self):
"""For necessary clean up, automatically called by TestCase after the test methods have been invoked"""
self.e.stop()
return
def check(self):
"""Do the actual testing."""
scene = self.scene
src = scene.children[0]
ud = src.children[0]
o = ud.children[0].children[0].children[0]
mm = o.children[0]
assert src.get_output_dataset().point_data.scalars.name == 'temperature'
assert src.get_output_dataset().point_data.vectors.name == 'velocity'
expect = ['ScalarGradient', 'Vorticity']
expect1 = [x +'-y' for x in expect]
expect2 = [x + ' magnitude' for x in expect]
o.enabled = True
assert o.get_output_dataset().point_data.scalars.name in expect1
assert o.get_output_dataset().point_data.vectors.name in expect
assert mm.scalar_lut_manager.data_name in expect1
# Turn of extraction.
o.enabled = False
assert o.get_output_dataset().point_data.scalars.name in expect2
assert o.get_output_dataset().point_data.vectors.name in expect
assert mm.scalar_lut_manager.data_name in expect2
# Compute the vorticity
ud.filter.vector_mode = 'compute_vorticity'
assert o.get_output_dataset().point_data.scalars.name == 'Vorticity magnitude'
assert o.get_output_dataset().point_data.vectors.name == 'Vorticity'
assert mm.scalar_lut_manager.data_name == 'Vorticity magnitude'
# Turn on extraction.
o.enabled = True
assert o.get_output_dataset().point_data.scalars.name == 'Vorticity-y'
assert o.get_output_dataset().point_data.vectors.name == 'Vorticity'
assert mm.scalar_lut_manager.data_name == 'Vorticity-y'
# Turn off extraction.
o.enabled = False
def test_user_defined(self):
"Test if the test fixture works"
#Now test.
s = self.scene
self.check()
#from mayavi.tools.show import show
#show()
def test_save_and_restore(self):
"""Test if saving a visualization and restoring it works."""
engine = self.e
scene = self.scene
# Save visualization.
f = BytesIO()
f.name = abspath('test.mv2') # We simulate a file.
engine.save_visualization(f)
f.seek(0) # So we can read this saved data.
# Remove existing scene.
engine.close_scene(scene)
# Load visualization
engine.load_visualization(f)
self.scene = engine.current_scene
s = self.scene
self.check()
def test_deepcopied(self):
"""Test if the MayaVi2 visualization can be deep-copied."""
############################################################
# Test if the MayaVi2 visualization can be deep-copied.
# Pop the source object.
s = self.scene
source = s.children.pop()
# Add it back to see if that works without error.
s.children.append(source)
cp = source.children[0].children[-1]
s = self.scene
self.check()
# Now deepcopy the source and replace the existing one with
# the copy. This basically simulates cutting/copying the
# object from the UI via the right-click menu on the tree
# view, and pasting the copy back.
source1 = copy.deepcopy(source)
s.children[0] = source1
s = self.scene
self.check()
#from mayavi.tools.show import show
#show()
if __name__ == '__main__':
unittest.main()
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