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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 numpy
import unittest
# Enthought library imports
from mayavi.core.null_engine import NullEngine
from mayavi.sources.vtk_data_source import VTKDataSource
from mayavi.modules.outline import Outline
from mayavi.modules.iso_surface import IsoSurface
from mayavi.modules.contour_grid_plane import ContourGridPlane
from mayavi.modules.scalar_cut_plane import ScalarCutPlane
from tvtk.api import tvtk
from mayavi.tests import datasets
class TestVTKDataSource(unittest.TestCase):
def setUp(self):
e = NullEngine()
# Uncomment to see visualization for debugging etc.
# e = Engine()
e.start()
e.new_scene()
self.e = e
sgrid = datasets.generateStructuredGrid()
src = VTKDataSource(data=sgrid)
e.add_source(src)
# 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 = 15
# 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 = 15
e.add_module(cgp2)
# An isosurface module.
iso = IsoSurface(compute_normals=True)
e.add_module(iso)
iso.contour.contours = [5]
# 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.iso = iso
self.cp = cp
def tearDown(self):
self.e.stop()
def check(self):
scene = self.scene
src = scene.children[0]
mm = src.children[0]
cgp1 = mm.children[1]
self.assertEqual(cgp1.grid_plane.position, 15)
cgp2 = mm.children[2]
self.assertEqual(cgp2.contour.filled_contours, True)
self.assertEqual(cgp2.grid_plane.axis, 'y')
self.assertEqual(cgp2.grid_plane.position, 15)
iso = mm.children[3]
ctr = iso.contour.contours
self.assertEqual(iso.compute_normals, True)
self.assertEqual(ctr, [5.0])
rng = iso.actor.mapper.input.point_data.scalars.range
self.assertEqual(rng[0], 5.0)
self.assertEqual(rng[1], 5.0)
cp = mm.children[4]
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_data_source(self):
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.
# 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()
def test_add_child(self):
"""Test if adding a source as a child works correctly."""
src = self.e.scenes[0].children[0]
new_src = VTKDataSource(data=tvtk.PolyData())
src.add_child(new_src)
class TestVTKDataSourceAttributes(unittest.TestCase):
def setUp(self):
sgrid = tvtk.StructuredPoints(
dimensions=(2, 2, 1), spacing=(1, 1, 1), origin=(0, 0, 0)
)
self.sgrid = sgrid
def test_add_attribute_works_for_point_data(self):
# Given
sgrid = self.sgrid
s1 = numpy.ones(4)
sgrid.point_data.scalars = s1
sgrid.point_data.scalars.name = 's1'
src = VTKDataSource(data=sgrid)
self.assertEqual(src.point_scalars_name, 's1')
self.assertEqual(sorted(src._point_scalars_list), ['', 's1'])
# When
s2 = s1 + 1.0
src.add_attribute(s2, 's2')
v1 = numpy.ones((4, 3))
src.add_attribute(v1, 'v1')
t1 = numpy.ones((4, 9))
src.add_attribute(t1, 't1')
# Then
self.assertEqual(src._point_scalars_list, ['', 's1', 's2'])
self.assertTrue(
numpy.allclose(src.data.point_data.get_array('s2').to_array(), s2)
)
self.assertEqual(src._point_vectors_list, ['', 'v1'])
self.assertTrue(
numpy.allclose(src.data.point_data.get_array('v1').to_array(), v1)
)
self.assertEqual(src._point_tensors_list, ['', 't1'])
self.assertTrue(
numpy.allclose(src.data.point_data.get_array('t1').to_array(), t1)
)
def test_add_attribute_works_for_cell_data(self):
# Given
sgrid = self.sgrid
s1 = numpy.ones(4)
sgrid.cell_data.scalars = s1
sgrid.cell_data.scalars.name = 's1'
src = VTKDataSource(data=sgrid)
self.assertEqual(src.cell_scalars_name, 's1')
self.assertEqual(sorted(src._cell_scalars_list), ['', 's1'])
# When
s2 = s1 + 1.0
src.add_attribute(s2, 's2', category='cell')
v1 = numpy.ones((4, 3))
src.add_attribute(v1, 'v1', category='cell')
t1 = numpy.ones((4, 9))
src.add_attribute(t1, 't1', category='cell')
# Then
self.assertEqual(src._cell_scalars_list, ['', 's1', 's2'])
self.assertTrue(
numpy.allclose(src.data.cell_data.get_array('s2').to_array(), s2)
)
self.assertEqual(src._cell_vectors_list, ['', 'v1'])
self.assertTrue(
numpy.allclose(src.data.cell_data.get_array('v1').to_array(), v1)
)
self.assertEqual(src._cell_tensors_list, ['', 't1'])
self.assertTrue(
numpy.allclose(src.data.cell_data.get_array('t1').to_array(), t1)
)
def test_add_attribute_raises_errors(self):
# Given
sgrid = self.sgrid
s1 = numpy.ones(4)
sgrid.point_data.scalars = s1
sgrid.point_data.scalars.name = 's1'
src = VTKDataSource(data=sgrid)
# When/Then
data = numpy.ones((4, 3, 3))
self.assertRaises(AssertionError, src.add_attribute, data, 's2')
data = numpy.ones((4, 5))
self.assertRaises(AssertionError, src.add_attribute, data, 's2')
def test_remove_attribute(self):
# Given
sgrid = self.sgrid
s1 = numpy.ones(4)
sgrid.point_data.scalars = s1
sgrid.point_data.scalars.name = 's1'
src = VTKDataSource(data=sgrid)
self.assertEqual(src.point_scalars_name, 's1')
self.assertEqual(sorted(src._point_scalars_list), ['', 's1'])
# When
s2 = s1 + 1.0
src.add_attribute(s2, 's2')
# Then
self.assertEqual(sorted(src._point_scalars_list), ['', 's1', 's2'])
# When
src.remove_attribute('s2')
# Then
self.assertEqual(sorted(src._point_scalars_list), ['', 's1'])
self.assertEqual(src.data.point_data.get_array('s2'), None)
def test_rename_attribute(self):
# Given
sgrid = self.sgrid
s1 = numpy.ones(4)
sgrid.point_data.scalars = s1
sgrid.point_data.scalars.name = 's1'
src = VTKDataSource(data=sgrid)
self.assertEqual(src.point_scalars_name, 's1')
self.assertEqual(sorted(src._point_scalars_list), ['', 's1'])
# When
src.rename_attribute('s1', 's2')
# Then
self.assertEqual(sorted(src._point_scalars_list), ['', 's2'])
self.assertTrue(numpy.all(src.data.point_data.get_array('s2') == s1))
self.assertEqual(src.data.point_data.get_array('s1'), None)
if __name__ == '__main__':
unittest.main()
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