I've previously written here about the vpython module that makes it easy to
display program-driven 3D animations in a Jupyter notebook.
I'm now trying to extend the vpython module to function if the user is not
running in a notebook, in response to requests from users. I detect whether
you're running in a notebook and do two different things depending on the
answer. If not in a notebook, I still use a browser for display, using the
GlowScript library that calls on WebGL.
I use webbrowser.open('http://localhost:{}'.format(HTTP_PORT)) to open a
browser window and start an HTTPServer, which sends to the browser an html
file containing the JavaScript program that will receive instructions from
the server to create or modify VPython objects and use those instructions
to tell the GlowScript library what to do. The communcations between server
and browser in the notebook case uses a websocket, and in the new option I
create an autobahn.asyncio.websocket in the server. What I run into is that
code that works in the notebook case fails in the new case, due to various
complications. I can solve a subset of these problems at the cost of the
others failing, no matter what subset I choose. It's a Whack-a-mole game.
To take just one example: In order that a user's simple one-line program
"box()" display a 3D box, and since I have no programmatic indication that
the end of the user's program has been reached, I have to run the websocket
in a thread; otherwise there is nothing to signal to the vpython module
that output needs to be sent to the browser. But if the websocket is in a
thread, there are problems of handling event-driven function calls, because
they count as being inside the thread, whereas user-program-driven function
calls are not in a thread. Etc.
So my ill-formed question is this: Can someone summarize the Jupyter
communications machinery in the context of my difficulty in doing something
similar? For example, in the notebook case I don't see any difference in
the behavior of user-driven function behavior and event-driven function
behavior.
Bruce
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