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"""Simple test for the VTKDataSource source. This is basically a copy
of test_contour.py with the data source alone modified.
"""
# Author: Prabhu Ramachandran <prabhu_r@users.sf.net>
# Copyright (c) 2005, Enthought, Inc.
# License: BSD Style.
# Standard library imports.
from os.path import abspath
from io import BytesIO
import copy
# Local imports.
from common import get_example_data
from test_contour import TestContour
class TestVTKDataSource(TestContour):
def make_data(self):
script = self.script
from mayavi.sources.vtk_data_source import VTKDataSource
from tvtk.api import tvtk
############################################################
# Create a new scene and set up the visualization.
s = self.new_scene()
# Read a VTK (old style) data file.
r = tvtk.StructuredPointsReader()
r.file_name = get_example_data('heart.vtk')
r.update()
d = VTKDataSource(data=r.output)
script.add_source(d)
def test(self):
self.main()
def do(self):
# Setup the source.
self.make_data()
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
script = self.script
s = script.engine.current_scene
# Create an outline for the data.
o = Outline()
script.add_module(o)
# Create one ContourGridPlane normal to the 'x' axis.
cgp = ContourGridPlane()
script.add_module(cgp)
# Set the position to the middle of the data.
cgp.grid_plane.position = 15
# Another with filled contours normal to 'y' axis.
cgp = ContourGridPlane()
cgp.contour.filled_contours = True
# Set the axis and position to the middle of the data.
cgp.grid_plane.axis = 'y'
cgp.grid_plane.position = 15
script.add_module(cgp)
# An isosurface module.
iso = IsoSurface(compute_normals=True)
script.add_module(iso)
iso.contour.contours = [200.0]
# An interactive scalar cut plane.
cp = ScalarCutPlane()
script.add_module(cp)
ip = cp.implicit_plane
ip.normal = 0,0,1
ip.origin = 0,0,5
ip.widget.enabled = False
# Set the scene to an isometric view.
s.scene.isometric_view()
self.check()
############################################################
# 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
self.check()
############################################################
# 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 set the enabled status of the widget, this is impossible
# to get correctly.
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()
# If we have come this far, we are golden!
if __name__ == "__main__":
t = TestVTKDataSource()
t.test()
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