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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
import numpy
# Enthought library imports
from mayavi.core.null_engine import NullEngine
from mayavi.sources.vtk_xml_file_reader import VTKXMLFileReader
from mayavi.modules.outline import Outline
from mayavi.modules.contour_grid_plane import ContourGridPlane
from mayavi.modules.scalar_cut_plane import ScalarCutPlane
# Local imports.
from mayavi.tests.common import get_example_data
class TestVTKXMLReader(unittest.TestCase):
def setUp(self):
e = NullEngine()
# Uncomment to see visualization for debugging etc.
#e = Engine()
e.start()
e.new_scene()
self.e=e
# Read a VTK XML data file.
r = VTKXMLFileReader()
r.initialize(get_example_data('cube.vti'))
e.add_source(r)
# Create an outline for the data.
o = Outline()
e.add_module(o)
# Create one ContourGridPlane normal to the 'x' axis.
cgp1 = ContourGridPlane()
e.add_module(cgp1)
# Set the position to the middle of the data.
cgp1.grid_plane.position = 1
# Another with filled contours normal to 'y' axis.
cgp2 = ContourGridPlane()
cgp2.contour.filled_contours = True
# Set the axis and position to the middle of the data.
cgp2.grid_plane.axis = 'y'
cgp2.grid_plane.position = 1
e.add_module(cgp2)
# An interactive scalar cut plane.
cp = ScalarCutPlane()
e.add_module(cp)
ip = cp.implicit_plane
ip.normal = 0,0,1
ip.origin = 0.5, 0.5, 1.0
# Since this is running offscreen this seems necessary.
ip.widget.origin = 0.5, 0.5, 1.0
ip.widget.enabled = False
self.scene = e.current_scene
self.cgp2=cgp2
self.cp=cp
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]
mm = src.children[0]
cgp1 = mm.children[1]
self.assertEqual(cgp1.grid_plane.position,1)
cgp2 = mm.children[2]
self.assertEqual(cgp2.contour.filled_contours,True)
self.assertEqual(cgp2.grid_plane.axis, 'y')
self.assertEqual(cgp2.grid_plane.position,1)
cp = mm.children[3]
ip = cp.implicit_plane
self.assertAlmostEqual(numpy.sum(ip.normal - (0,0,1)) , 1e-16)
self.assertAlmostEqual(numpy.sum(ip.origin - (0.5, 0.5, 1.0)), 0.0)
self.assertEqual(ip.widget.enabled,False)
def test_vtk_xml_reader(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
# 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)
cp = source.children[0].children[-1]
cp.implicit_plane.widget.enabled = False
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
cp = source1.children[0].children[-1]
cp.implicit_plane.widget.enabled = False
self.check()
#from mayavi.tools.show import show
#show()
if __name__ == '__main__':
unittest.main()
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