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# Author: Suyog Dutt Jain <suyog.jain@aero.iitb.ac.in>
# Prabhu Ramachandran <prabhu_r@users.sf.net>
# Copyright (c) 2008, Enthought, Inc.
# License: BSD Style.
# Standard library imports.
from os.path import abspath
from io import BytesIO
import copy
import unittest
# Local imports.
from mayavi.tests.common import get_example_data
# Enthought library imports
from mayavi.core.null_engine import NullEngine
from mayavi.sources.vtk_xml_file_reader import VTKXMLFileReader
from mayavi.modules.api import ContourGridPlane
from mayavi.filters.image_data_probe import ImageDataProbe
class TestImageDataProbe(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.
idp = ImageDataProbe()
idp.rescale_scalars = True
e.add_filter(idp)
cgp = ContourGridPlane(enable_contours=False)
e.add_module(cgp)
cgp.grid_plane.axis = 'z'
cgp.grid_plane.position = 1
self.scene = e.current_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]
idp = src.children[0]
mm = idp.children[0]
self.assertEqual(src.get_output_dataset().is_a('vtkUnstructuredGrid'),True)
self.assertEqual(idp.get_output_dataset().is_a('vtkImageData'),True)
sc = idp.get_output_dataset().point_data.scalars
vc = idp.get_output_dataset().point_data.vectors
self.assertEqual(sc.name,idp.rescaled_scalar_name)
self.assertEqual(vc.name,'velocity')
self.assertEqual(mm.scalar_lut_manager.data_name,
idp.rescaled_scalar_name)
self.assertEqual((abs(sc.range[0]) < 1e-2),True)
self.assertEqual( abs(sc.range[1] - 65535.0) < 1.e-2,True)
self.assertEqual((idp.get_output_dataset().dimensions == (3, 3, 2)).all(),True)
def test_image_data_probe(self):
"Test if the test fixture works"
#Now test.
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
self.check()
# 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
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)
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
self.check()
#from mayavi.tools.show import show
#show()
if __name__ == '__main__':
unittest.main()
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