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"""Simple test for the UsedDefined filter.
"""
# Author: Prabhu Ramachandran <prabhu [at] aero . iitb . ac . in>
# Copyright (c) 2008, Enthought, Inc.
# License: BSD Style.
# Standard library imports.
from os.path import abspath
from io import BytesIO
import copy
# Enthought library imports.
from tvtk.api import tvtk
# Local imports.
from common import TestCase, get_example_data
class TestUserDefined(TestCase):
def check(self, saved=False):
"""Does the checking, if saved is True it does not change the
properties at first to see how those behave and only tests the
final unpickled state."""
script = self.script
e = script.engine
scene = e.current_scene
src = scene.children[0]
ud = src.children[0]
o = ud.children[0].children[0].children[0]
mm = o.children[0]
if not saved:
assert ud.filter.vector_mode == 'compute_gradient'
assert src.get_output_dataset().point_data.scalars.name == 't'
assert src.get_output_dataset().point_data.vectors.name == 'uvw'
expect = ['ScalarGradient', 'Vorticity']
expect1 = [x +'-y' for x in expect]
expect2 = [x + ' magnitude' for x in expect]
# FIXME: This is really a bug in VTK, the name of the scalar
# should really be ScalarGradient-y. This is fixed in
# 5.2 but earlier versions fail.
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(self):
self.main()
def do(self):
############################################################
# Imports.
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
############################################################
# Create a new scene and set up the visualization.
s = self.new_scene()
script = mayavi = self.script
# Read a VTK (old style) data file.
r = VTKXMLFileReader()
r.initialize(get_example_data('fire_ug.vtu'))
script.add_source(r)
# Create the filters.
# CellDerivatives
cd = tvtk.CellDerivatives()
ud = UserDefined(filter=cd)
script.add_filter(ud)
ctp = CellToPointData()
ctp.filter.pass_cell_data = False
script.add_filter(ctp)
evn = ExtractVectorNorm()
script.add_filter(evn)
evc = ExtractVectorComponents(component='y-component')
o = Optional(filter=evc)
script.add_filter(o)
script.add_module(ScalarCutPlane())
s.scene.isometric_view()
# Check.
self.check(saved=False)
############################################################
# Test if saving a visualization and restoring it works.
# Save visualization.
f = BytesIO()
f.name = abspath('test.mv2') # We simulate a file.
script.save_visualization(f)
f.seek(0) # So we can read this saved data.
# Remove existing scene.
engine = script.engine
engine.close_scene(s)
# Load visualization
script.load_visualization(f)
s = engine.current_scene
s.scene.isometric_view()
# Now do the check.
self.check(saved=True)
############################################################
# Test if the Mayavi2 visualization can be deep-copied.
# Pop the source object.
source = s.children.pop()
# Add it back to see if that works without error.
s.children.append(source)
# Now do the check.
s.scene.isometric_view()
self.check(saved=True)
# 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
# Now do the check.
s.scene.isometric_view()
self.check(saved=True)
# If we have come this far, we are golden!
if __name__ == "__main__":
t = TestUserDefined()
t.test()
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