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
r = VTKXMLFileReader()
r.initialize(get_example_data('pyramid_ug.vtu'))
e.add_source(r)
r.point_scalars_name = 'temperature'
o = Outline()
e.add_module(o)
c = Contour()
e.add_filter(c)
n = PolyDataNormals()
e.add_filter(n)
aa = SetActiveAttribute()
e.add_filter(aa)
aa.point_scalars_name = 'pressure'
s = Surface()
e.add_module(s)
self.scene = e.current_scene
return
def generate_data_mayavi(self):
"""Shows how you can generate data using mayavi instead of mlab."""
from enthought.mayavi.sources.api import ParametricSurface
from enthought.mayavi.modules.api import Outline, Surface
e = self.scene.engine
s = ParametricSurface()
e.add_source(s)
e.add_module(Outline())
e.add_module(Surface())
def show_mesh(file_name, ndim):
mayavi_engine = Engine()
mayavi_engine.start()
mayavi_engine.new_scene()
# View the MayaVi pipeline
engine_view = EngineView(engine=mayavi_engine)
ui = engine_view.edit_traits()
# Setup MayaVi pipeline
src = TriangleReader()
if (ndim == 2):
src.initialize(file_name+'.edge') # Load the 2D .edge file
else:
src.initialize(file_name+'.face') # Load the 3D .face file
mayavi_engine.add_source(src)
# Add any filters, modules here in the order that they are to appear in the pipeline
mayavi_engine.add_module(Surface())
def main():
mayavi.new_scene()
# Read the example data: fire_ug.vtu.
r = VTKXMLFileReader()
filename = join(mayavi2.get_data_dir(dirname(abspath(__file__))),
'fire_ug.vtu')
r.initialize(filename)
mayavi.add_source(r)
# Set the active point scalars to 'u'.
r.point_scalars_name = 'u'
# Simple outline for the data.
o = Outline()
mayavi.add_module(o)
# Branch the pipeline with a contour -- the outline above is
# directly attached to the source whereas the contour below is a
# filter and will branch the flow of data. An isosurface in the
# 'u' data attribute is generated and normals generated for it.
c = Contour()
mayavi.add_filter(c)
n = PolyDataNormals()
mayavi.add_filter(n)
# Now we want to show the temperature 't' on the surface of the 'u'
# iso-contour. This is easily done by using the SetActiveAttribute
# filter below.
aa = SetActiveAttribute()
mayavi.add_filter(aa)
aa.point_scalars_name = 't'
# Now view the iso-contours of 't' with a Surface filter.
s = Surface(enable_contours=True)
mayavi.add_module(s)
import numpy as np
engine = Engine()
engine.start()
scene = engine.new_scene()
scene.scene.disable_render = True # for speed
surfaces = []
for i in range(10):
source = ParametricSurface()
source.function = 'ellipsoid'
engine.add_source(source)
surface = Surface()
source.add_module(surface)
actor = surface.actor # mayavi actor, actor.actor is tvtk actor
#actor.property.ambient = 1 # defaults to 0 for some reason, ah don't need it, turn off scalar visibility instead
actor.property.opacity = 0.5
actor.property.color = tuple(np.random.rand(3))
actor.mapper.scalar_visibility = False # don't colour ellipses by their scalar indices into colour map
actor.property.backface_culling = True # gets rid of weird rendering artifact when opacity is < 1
#actor.property.frontface_culling = True
actor.actor.orientation = np.random.rand(3) * 360 # in degrees
actor.actor.origin = np.random.rand(3)
actor.actor.position = np.random.rand(3)
actor.actor.scale = np.random.rand(3)
surfaces.append(surface)
def do(self):
############################################################
# Imports.
script = self.script
from enthought.mayavi.sources.vtk_file_reader import VTKFileReader
from enthought.mayavi.filters.contour import Contour
from enthought.mayavi.filters.optional import Optional
from enthought.mayavi.filters.collection import Collection
from enthought.mayavi.filters.api import PolyDataNormals
from enthought.mayavi.modules.api import Surface
############################################################
# Create a new scene and set up the visualization.
s = self.new_scene()
# Read a VTK (old style) data file.
r = VTKFileReader()
r.initialize(get_example_data('heart.vtk'))
script.add_source(r)
c = Contour()
# `name` is used for the notebook tabs.
n = PolyDataNormals(name='Normals')
o = Optional(filter=n, label_text='Compute normals')
coll = Collection(filters=[c, o], name='IsoSurface')
script.add_filter(coll)
s = Surface()
script.add_module(s)
########################################
# do the testing.
def check(coll):
"""Check if test status is OK given the collection."""
c, o = coll.filters
c = c.filter
n = o.filter
assert coll.outputs[0].point_data.scalars.range == (127.5, 127.5)
# Adding a contour should create the appropriate output in
# the collection.
c.contours.append(200)
assert coll.outputs[0].point_data.scalars.range == (127.5, 200.0)
# the collection's output should be that of the normals.
assert coll.outputs[0] is n.outputs[0]
# disable the optional filter and check.
o.enabled = False
assert 'disabled' in o.name
assert coll.outputs[0] is c.outputs[0]
# Set back everything to original state.
c.contours.pop()
o.enabled = True
assert coll.outputs[0].point_data.scalars.range == (127.5, 127.5)
assert coll.outputs[0] is n.outputs[0]
assert 'disabled' not in o.name
check(coll)
############################################################
# Test if saving a visualization and restoring it works.
# Save visualization.
f = StringIO()
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
# Now do the check.
coll = s.children[0].children[0]
check(coll)
############################################################
# 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.
coll = s.children[0].children[0]
check(coll)
# 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.
coll = s.children[0].children[0]
check(coll)
