def setUp(self):

        e = NullEngine()
        # Uncomment to see visualization for debugging etc.
        # e = Engine()
        e.start()
        s = e.new_scene()

        image_data = BuiltinImage()
        e.add_source(image_data)

        outline = Outline()
        e.add_module(outline)

        surface = Surface()
        e.add_module(surface)

        image_data.data_source.radius = array([80.0, 80.0, 80.0])
        image_data.data_source.center = array([150.0, 150.0, 0.0])
        image_data.data_source.whole_extent = array([10, 245, 10, 245, 0, 0])
        if is_old_pipeline():
            image_data.data_source.update_whole_extent()
        else:
            image_data.data_source.set_update_extent_to_whole_extent()

        self.e = e
        self.scene = e.current_scene

        return

    def get_null_engine(self):
        """Return a suitable null engine and make that the current
        engine.
        """
        # First check if the current engine is running and if it is in
        # the registered engines.
        ce = self.current_engine
        if ce is not None:
            if not ce.running or ce not in registry.engines.values():
                self.current_engine = None

        if self.current_engine is not None:
            engines = list((self.current_engine,))
        else:
            engines = list()
        engines.extend(registry.engines.values())
        engine = None
        for e in engines:
            if e.__class__.__name__ == 'NullEngine':
                engine = e
                break
        else:
            engine = NullEngine(name='Null Mlab Engine')
            engine.start()
        self.current_engine = engine
        return engine

    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()
        s = e.new_scene()

        poly_data = BuiltinSurface()
        e.add_source(poly_data)

        outline = Outline()
        e.add_module(outline)

        surface = Surface()
        e.add_module(surface)

        poly_data.data_source.shaft_radius = 0.05
        poly_data.data_source.shaft_resolution = 7
        poly_data.data_source.tip_radius = 0.1

        self.e = e
        self.scene = e.current_scene

        return

 def setUp(self):
     e = NullEngine()
     e.start()
     registry.register_engine(e)
     engine_manager.current_engine = e
     self.e = e
     self.s = e.new_scene()
     self.s.scene = DummyScene()

    def setUp(self):
        # Create dataset with multiple scalars.
        arr1 = zeros(27, 'f')
        for n in range(27):
            arr1[n] = (1+float(n))/10.0
        arr2 = (arr1 + 1).astype('d')
        arr3 = arr1 + 2.0*(0.5 - random.random(27))
        arr3 = arr3.astype('f')

        p = tvtk.ImageData(dimensions=[3,3,3],spacing=[1,1,1],
                scalar_type='int')
        p.point_data.scalars = arr1
        p.point_data.scalars.name = 'first'
        j2 = p.point_data.add_array(arr2)
        p.point_data.get_array(j2).name='second'
        j3 = p.point_data.add_array(arr3)
        p.point_data.get_array(j3).name='third'
        p.update()
        self.img = p
        self.first = arr1
        self.second = arr2
        self.third = arr3

        # Setup the mayavi pipeline.
        e = NullEngine()
        e.start()
        e.new_scene()
        self.e = e

        src = VTKDataSource(data=p)
        e.add_source(src)
        self.src = src
        ipw = ImagePlaneWidget()
        e.add_module(ipw)
        self.ipw = ipw

    def new_engine(self):
        """ Creates a new engine, envisage or not depending on the
            options.
        """
        check_backend()
        if options.backend == "envisage":
            from mayavi.plugins.app import Mayavi

            m = Mayavi(start_gui_event_loop=False)
            m.main()
            process_ui_events()
            window = m.application.workbench.active_window
            engine = window.get_service(Engine)
        elif options.backend == "test":
            engine = NullEngine(name="Null Mlab Engine")
            engine.start()
        else:
            if options.offscreen:
                engine = OffScreenEngine(name="Mlab offscreen Engine")
                engine.start()
            else:
                engine = Engine(name="Mlab Engine")
                engine.start()
        self.current_engine = engine
        return engine

    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.
        #from mayavi.core.engine import Engine
        #e = Engine()
        e.start()
        e.new_scene()
        self.e = e

 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
     self.scene = e.current_scene
     return

    def setUp(self):

        e = NullEngine()
        # Uncomment to see visualization for debugging etc.
        #e = Engine()
        e.start()
        self.e = e
        s = e.new_scene()
        self.scene = e.current_scene

        self.setup_reader()
        self.setup_viz()
        return

 def create_fn():
     e = NullEngine()
     e.start()
     e.new_scene()
     e.new_scene()
     e.new_scene()
     return e

    def setUp(self):

        self.root = tempfile.mkdtemp()
        abc1 = os.path.join(self.root, "abc_1.vti")
        abc2 = os.path.join(self.root, "abc_2.vti")
        def1 = os.path.join(self.root, "def_1.vti")
        def2 = os.path.join(self.root, "def_2.vti")
        xyz1 = os.path.join(self.root, "xyz_1.vti")
        cube = get_example_data("cube.vti")
        self.abc1, self.abc2 = abc1, abc2
        self.def1, self.def2 = def1, def2
        self.xyz1 = xyz1
        self.cube = cube
        for i in (abc1, abc2, def1, def2, xyz1):
            shutil.copy(cube, i)

        e = NullEngine()
        # Uncomment to see visualization for debugging etc.
        # e = Engine()
        e.start()
        e.new_scene()
        self.engine = e

 def setUp(self):
     e = NullEngine()
     e.start()
     e.new_scene()
     scene = e.scenes[-1]
     s = ParametricSurface()
     e.add_source(s)
     o = Outline()
     s.add_child(o)
     o1 = Outline()
     s.add_child(o1)
     self.scene = scene
     self.e = e
     self.s = s
     self.o = o
     self.o1 = o1
     return

    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()
        s=e.new_scene()
        self.e=e
        self.s=s

        ############################################################
        # Create a new scene and set up the visualization.

        d = ArraySource()
        sc = self.make_data()
        d.scalar_data = sc

        e.add_source(d)
        self.t = Text3D()
        e.add_module(self.t)

        self.scene = e.current_scene
        return

    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

        sgrid=datasets.generateStructuredGrid()
        src = VTKDataSource(data = sgrid)
        e.add_source(src)

        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')
        e.add_filter(coll)
        s = Surface()
        e.add_module(s)
        self.coll = coll
        self.scene = e.current_scene
        return

    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 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()
        s=e.new_scene()
        self.e=e
        self.s=s

        ############################################################
        # Create a new scene and set up the visualization.

        d = ArraySource()
        sc, vec = self.make_data()
        d.origin = (-5, -5, -5)
        d.scalar_data = sc
        d.vector_data = vec

        e.add_source(d)

        # Create an outline for the data.
        o = Outline()
        e.add_module(o)
        # Glyphs for the scalars
        g = Glyph()
        e.add_module(g)
        g.glyph.glyph_source.glyph_position = 'center'
        g.glyph.glyph.vector_mode = 'use_normal'
        g.glyph.glyph.scale_factor = 0.5
        g.glyph.mask_points.on_ratio = 20
        g.actor.property.line_width = 1.0

        v = VectorCutPlane()
        glyph = v.glyph
        gs = glyph.glyph_source
        gs.glyph_position = 'tail'
        gs.glyph_source = gs.glyph_list[1]
        e.add_module(v)
        v.implicit_plane.set(normal=(0, 1, 0), origin=(0, 3, 0))

        v = VectorCutPlane()
        glyph = v.glyph
        gs = glyph.glyph_source
        gs.glyph_source = gs.glyph_list[2]
        gs.glyph_position = 'head'
        e.add_module(v)
        v.implicit_plane.set(normal=(0, 1, 0), origin=(0, -2, 0))
        self.g=g
        self.v=v
        self.scene = e.current_scene
        return

    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 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()
        s=e.new_scene()
        self.e=e
        self.s=s

        ############################################################
        # Create a new scene and set up the visualization.

        d = ArraySource()
        sc, vec = self.make_data()
        d.origin = (-5, -5, -5)
        d.scalar_data = sc
        d.vector_data = vec

        e.add_source(d)

        # Create an outline for the data.
        o = Outline()
        e.add_module(o)

        # View the data.
        st = Streamline()
        e.add_module(st)
        widget = st.seed.widget
        widget.set(radius=1.0, center=(-4.0, -4.0, -4.0),
                   theta_resolution=4, phi_resolution=4)

        st = Streamline(streamline_type='ribbon')
        seed = st.seed
        seed.widget = seed.widget_list[1]
        e.add_module(st)
        seed.widget.set(point1=(-5.0, -4.5, -4.0), point2=(-5.0, -4.5, 4.0))
        st.ribbon_filter.width = 0.25

        st = Streamline(streamline_type='tube')
        seed = st.seed
        seed.widget = seed.widget_list[2]
        e.add_module(st)
        seed.widget.set(center=(-5.0, 1.5, -2.5))
        st.tube_filter.radius = 0.15

        st = Streamline(streamline_type='tube')
        seed = st.seed
        seed.widget = seed.widget_list[3]
        e.add_module(st)
        seed.widget.position=(-5.0, 3.75, 3.75)
        st.tube_filter.radius = 0.2
        self.st = st
        self.scene = e.current_scene
        return

    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()
        s=e.new_scene()
        self.e=e
        self.s=s

        ############################################################
        # Create a new scene and set up the visualization.

        #Make the grid
        grid = self.make_grid4scatter()
        e.add_source(grid)

        eg = ExtractGrid()
        e.add_filter(eg)

        nb_ticks = 6

        eg.x_ratio = eg.y_ratio = eg.z_ratio = 100/(nb_ticks-1)/2

        gpx = GridPlane()
        e.add_module(gpx)
        gpx.grid_plane.axis = 'x'

        gpy = GridPlane()
        e.add_module(gpy)
        gpy.grid_plane.axis = 'y'

        gpz = GridPlane()
        e.add_module(gpz)
        gpz.grid_plane.axis = 'z'

        #Add the scatter
        d = VTKDataSource()
        d.data = self.make_scatter()
        e.add_source(d)
        if is_old_pipeline():
            a = Axes()
            e.add_module(a)
            a.axes.number_of_labels = nb_ticks

        self.eg = eg
        self.gpx = gpx
        self.gpy = gpy
        self.gpz = gpz
        self.scene = e.current_scene
        return

 def setUp(self):
     mlab.options.backend = 'test'
     e = NullEngine()
     e.start()
     mlab.set_engine(e)
     self.e = e