""" Example of an elaborate dialog showing a multiple views on the same data, with 3 cuts synchronized. This example shows how to have multiple views on the same data, how to embedded multiple scenes in a dialog, and the caveat in populating them with data, as well as how to add some interaction logic on an ImagePlaneWidget. The order in which things happen in this example is important, and it is easy to get it wrong. First of all, many properties of the visualization objects cannot be changed if there is not a scene created to view them. This is why we put a lot of the visualization logic in the callback of scene.activated, which is called after creation of the scene. Second, default values created via the '_xxx_default' callback are created lazyly, that is, when the attributes are accessed. As the establishement of the VTK pipeline can depend on the order in which it is built, we trigger these access by explicitely calling the attributes. In particular, properties like scene background color, or interaction properties cannot be set before the scene is activated. The same data is exposed in the different scenes by sharing the VTK dataset between different Mayavi data sources. See the :ref:`sharing_data_between_scenes` tip for more details. In this example, the interaction with the scene and the various elements on it is strongly simplified by turning off interaction, and choosing specific scene interactor styles. Indeed, non-technical users can be confused with too rich interaction. """ # Author: Gael Varoquaux <gael.varoquaux@normalesup.org> # Copyright (c) 2009, Enthought, Inc. # License: BSD Style. import numpy as np from enthought.traits.api import HasTraits, Instance, Array, \ on_trait_change from enthought.traits.ui.api import View, Item, HGroup, Group from enthought.tvtk.api import tvtk from enthought.tvtk.pyface.scene import Scene from enthought.mayavi import mlab from enthought.mayavi.core.api import PipelineBase, Source from enthought.mayavi.core.ui.api import SceneEditor, MayaviScene from enthought.mayavi.tools.mlab_scene_model import MlabSceneModel ################################################################################ # Create some data x, y, z = np.ogrid[-5:5:64j, -5:5:64j, -5:5:64j] data = np.sin(3*x)/x + 0.05*z**2 + np.cos(3*y) ################################################################################ # The object implementing the dialog class VolumeSlicer(HasTraits): # The data to plot data = Array() # The 4 views displayed scene3d = Instance(MlabSceneModel, ()) scene_x = Instance(MlabSceneModel, ()) scene_y = Instance(MlabSceneModel, ()) scene_z = Instance(MlabSceneModel, ()) # The data source data_src3d = Instance(Source) # The image plane widgets of the 3D scene ipw_3d_x = Instance(PipelineBase) ipw_3d_y = Instance(PipelineBase) ipw_3d_z = Instance(PipelineBase) _axis_names = dict(x=0, y=1, z=2) #--------------------------------------------------------------------------- def __init__(self, **traits): super(VolumeSlicer, self).__init__(**traits) # Force the creation of the image_plane_widgets: self.ipw_3d_x self.ipw_3d_y self.ipw_3d_z #--------------------------------------------------------------------------- # Default values #--------------------------------------------------------------------------- def _data_src3d_default(self): return mlab.pipeline.scalar_field(self.data, figure=self.scene3d.mayavi_scene) def make_ipw_3d(self, axis_name): ipw = mlab.pipeline.image_plane_widget(self.data_src3d, figure=self.scene3d.mayavi_scene, plane_orientation='%s_axes' % axis_name) return ipw def _ipw_3d_x_default(self): return self.make_ipw_3d('x') def _ipw_3d_y_default(self): return self.make_ipw_3d('y') def _ipw_3d_z_default(self): return self.make_ipw_3d('z') #--------------------------------------------------------------------------- # Scene activation callbaks #--------------------------------------------------------------------------- @on_trait_change('scene3d.activated') def display_scene3d(self): outline = mlab.pipeline.outline(self.data_src3d, figure=self.scene3d.mayavi_scene, ) self.scene3d.mlab.view(40, 50) # Interaction properties can only be changed after the scene # has been created, and thus the interactor exists for ipw in (self.ipw_3d_x, self.ipw_3d_y, self.ipw_3d_z): # Turn the interaction off ipw.ipw.interaction = 0 self.scene3d.scene.background = (0, 0, 0) # Keep the view always pointing up self.scene3d.scene.interactor.interactor_style = \ tvtk.InteractorStyleTerrain() def make_side_view(self, axis_name): scene = getattr(self, 'scene_%s' % axis_name) # To avoid copying the data, we take a reference to the # raw VTK dataset, and pass it on to mlab. Mlab will create # a Mayavi source from the VTK without copying it. # We have to specify the figure so that the data gets # added on the figure we are interested in. outline = mlab.pipeline.outline( self.data_src3d.mlab_source.dataset, figure=scene.mayavi_scene, ) ipw = mlab.pipeline.image_plane_widget( outline, plane_orientation='%s_axes' % axis_name) setattr(self, 'ipw_%s' % axis_name, ipw) # Synchronize positions between the corresponding image plane # widgets on different views. ipw.ipw.sync_trait('slice_position', getattr(self, 'ipw_3d_%s'% axis_name).ipw) # Make left-clicking create a crosshair ipw.ipw.left_button_action = 0 # Add a callback on the image plane widget interaction to # move the others def move_view(obj, evt): position = obj.GetCurrentCursorPosition() for other_axis, axis_number in self._axis_names.iteritems(): if other_axis == axis_name: continue ipw3d = getattr(self, 'ipw_3d_%s' % other_axis) ipw3d.ipw.slice_position = position[axis_number] ipw.ipw.add_observer('InteractionEvent', move_view) ipw.ipw.add_observer('StartInteractionEvent', move_view) # Center the image plane widget ipw.ipw.slice_position = 0.5*self.data.shape[ self._axis_names[axis_name]] # Position the view for the scene views = dict(x=( 0, 90), y=(90, 90), z=( 0, 0), ) scene.mlab.view(*views[axis_name]) # 2D interaction: only pan and zoom scene.scene.interactor.interactor_style = \ tvtk.InteractorStyleImage() scene.scene.background = (0, 0, 0) @on_trait_change('scene_x.activated') def display_scene_x(self): return self.make_side_view('x') @on_trait_change('scene_y.activated') def display_scene_y(self): return self.make_side_view('y') @on_trait_change('scene_z.activated') def display_scene_z(self): return self.make_side_view('z') #--------------------------------------------------------------------------- # The layout of the dialog created #--------------------------------------------------------------------------- view = View(HGroup( Group( Item('scene_y', editor=SceneEditor(scene_class=Scene), height=250, width=300), Item('scene_z', editor=SceneEditor(scene_class=Scene), height=250, width=300), show_labels=False, ), Group( Item('scene_x', editor=SceneEditor(scene_class=Scene), height=250, width=300), Item('scene3d', editor=SceneEditor(scene_class=MayaviScene), height=250, width=300), show_labels=False, ), ), resizable=True, title='Volume Slicer', ) m = VolumeSlicer(data=data) m.configure_traits()