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"""
A Null engine for Mayavi.
The `NullEngine` class lets you create a full-fledged (almost) Mayavi
engine without the need for it poping up a window.
It is useful for testing or for using VTK as numerical engine. It does
not allow for rendering.
"""
# Author: Prabhu Ramachandran <prabhu@aero.iitb.ac.in>
# Copyright (c) 2008, Enthought, Inc.
# License: BSD Style.
from traits.api import HasTraits, Any, Event, Callable
from mayavi.core.engine import Engine
def dummy_viewer_factory():
"""Factory function for the dummy viewer."""
return DummyViewer()
################################################################################
# `NullEngine` class.
################################################################################
class NullEngine(Engine):
"""
This class represents a NullEngine which creates a DummyViewer with
a scene set to None. This allows us to write full mayavi scripts
without the need for a UI and this is perfect for testing, or to
use Mayavi (and VTK) as a numerical engine.
This engine does not allow for rendring.
"""
scene_factory = Callable(dummy_viewer_factory)
################################################################################
# `DummyViewer` class.
################################################################################
class DummyViewer(HasTraits):
"""Mimics the API of a viewer."""
scene = Any
closing = Event
activated = Event
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